Associate Professor Tina Summerfield, Profile, Plant Biotechnology

Tina Summerfield (far right) and lab members.

Contact

Email tina.summerfield@otago.ac.nz
Tel +64 3 479 7578

Research interests

Cyanobacterial diversity, genetics and ecophysiology, the potential of cyanobacteria as a renewable energy source and cyanobacterial symbioses.

Teaching involvement

BIOL 123 Plants: How They Shape the World
BTNY 203 Marine and Freshwater Botany
BTNY 365 Research Skills
BTNY 465 Plant and Environment
CELS 191 Cell and Molecular Biology
ECOL 212 Ecological Applications
GENE 223 Developmental and Applied Genetics
GENE 360 Extension Topics and Research Skills
PLBI 301 Applied Plant Science
PLBI 401 Frontiers in Plant Biotechnology

Current research

My research focuses on cyanobacteria and the molecular mechanisms underpinning their photosynthetic function, genome stability, and ecological interactions. I am particularly interested in how cyanobacteria adapt to changing environmental conditions and how we can harness this knowledge to address both fundamental biological questions and applied challenges in biotechnology and environmental management.

If you're a student interested in joining a project in any of the areas below, please get in touch.

Photosystem II

Photosystem II ( PSII ) is a key component of the photosynthetic machinery, and understanding how it is assembled, regulated, and protected is central to improving the efficiency of photosynthesis in cyanobacteria. My research examines the roles of specific proteins in PSII function. This work includes genetic and physiological approaches to uncover how cyanobacteria optimise light capture while preventing photodamage.

Genome stability and repair mechanisms

Cyanobacteria often experience intense environmental stress, including high light, oxidative conditions, and UV radiation, which can damage their DNA . My lab investigates the mechanisms by which cyanobacteria maintain genome integrity, with a focus on DNA repair pathways, replication fidelity, and cellular responses to damage. Understanding these mechanisms is essential not only for basic biology but also for biotechnological applications, where stable genetic expression is critical for engineering cyanobacteria as reliable production platforms. This research supports efforts to optimize cyanobacteria for long-term cultivation in outdoor bioreactors and for synthetic biology applications requiring precise and sustained gene function.

Cyanobacterial blooms and their microbiomes

Cyanobacterial blooms are a growing environmental concern. We are exploring how microbial communities associated with blooms (the bloom microbiome) influence bloom dynamics, toxin production, and environmental impact. This research sits at the intersection of microbial ecology, environmental science, and biotechnology.

Lichen symbioses and nitrogen-fixing cyanobacteria

We are also interested in symbiotic associations involving cyanobacteria. This includes cyanobacteria living in association with lichens and free-living forms in soil crusts and biofilms. We are examining the structure and composition of these microbial communities, how they respond to environmental change, and their broader ecological roles. This area bridges fundamental symbiosis research with potential applications in conservation and land restoration.

Publications

Detoni, M., Allan, A., Connelly, S., Summerfield, T., Townsend, S., & Shephard, K. (2025). University teachers’ perspectives on student attendance: a challenge to the identity of university teachers before, during and after Covid-19. Educational Research for Policy & Practice, 24, 41-59. doi: 10.1007/s10671-024-09375-6 Journal - Research Article

Brown, T. J., Vass, I., Summerfield, T. C., & Eaton-Rye, J. J. (2024). Phe265 of the D1 protein is required to stabilize plastoquinone binding in the QB-binding site of photosystem II in Synechocystis sp. PCC 6803. Biochemical & Biophysical Research Communications, 733, 150692. doi: 10.1016/j.bbrc.2024.150692 Journal - Research Article

Asih, D. R., Handayani, W., Ananda, A. Z., Yuniati, R., Hirota, R., Summerfield, T. C., & Eaton-Rye, J. J. (2024). An insight into potential phosphate bioremediation and renewable energy from agricultural waste via integrated wastewater treatment systems in Indonesia. Environmental Research Communications, 6, 042001. doi: 10.1088/2515-7620/ad359c Journal - Research Other

Nicol, D. A., Saldivia, P., Summerfield, T. C., Heads, M., Lord, J. M., Khaing, E. P., & Larcombe, M. J. (2024). Phylogenomics and morphology of the polyploid Celmisiinae (Asteraceae: Astereae): Taxonomic and evolutionary implications. Molecular Phylogenetics & Evolution, 195, 108064. doi: 10.1016/j.ympev.2024.108064 Journal - Research Article

Sheridan, K. J., Eaton-Rye, J. J., & Summerfield, T. C. (2024). Mutagenesis of Ile184 in the cd-loop of the photosystem II D1 protein modifies acceptor-side function via spontaneous mutation of D1-His252 in Synechocystis sp. PCC 6803. Biochemical & Biophysical Research Communications, 702, 149595. doi: 10.1016/j.bbrc.2024.149595 Journal - Research Article

2025

Journal - Research Article

2024

Journal - Research Article

Forsman, J. A., Sheridan, K. J., Singh, H., Brown, T. J., Vass, I., Summerfield, T. C., & Eaton-Rye, J. J. (2024). The Psb27 assembly factor and histidine-252 of the D1 protein modify energy transfer to photosystem II in Synechocystis sp. PCC 6803. Physiologia Plantarum, 176, e14154. doi: 10.1111/ppl.14154

Journal - Research Other

2023

Journal - Research Article

Sheridan, K. J., Brown, T. J., Eaton-Rye, J. J., & Summerfield, T. C. (2023). Expression of the far-red D1 protein or introduction of conserved far-red D1 residues into Synechocystis sp. PCC 6803 impairs Photosystem II. Physiologia Plantarum, 175, e13997. doi: 10.1111/ppl.13997

van Galen, L. G., Orlovich, D. A., Lord, J. M., Bohorquez, J., Nilsen, A. R., Summerfield, T. C., & Larcombe, M. J. (2023). Zeta diversity differentiates factors driving community assembly of rare and common ectomycorrhizal fungi. Molecular Ecology, 32(8), 2092-2109. doi: 10.1111/mec.16860

Conference Contribution - Verbal presentation and other Conference outputs

Chyou, T., Fox, W., Padilla, E., Nilsen, A., Mendoza, A., Plett, J., Summerfield, T., Orlovich, D., & Brown, C. M. (2023, August). Detecting non-coding genes in mushroom and truffle-like fungal genomes. Verbal presentation at the Queenstown Molecular Biology (QMB) Genomics Satellite, Queenstown, New Zealand.

2022

Journal - Research Article

Choo, P., Forsman, J. A., Hui, L., Khaing, E. P., Summerfield, T. C., & Eaton-Rye, J. J. (2022). The PsbJ protein is required for photosystem II activity in centers lacking the PsbO and PsbV lumenal subunits. Photosynthesis Research, 151, 103-111. doi: 10.1007/s11120-021-00862-y

Conference Contribution - Published proceedings: Full paper

Asih, D. R., Summerfield, T. C., & Eaton-Rye, J. J. (2022). Exploration of cyanobacteria as bioremediation candidates to reduce phosphorous contamination. IOP Conference Series: Earth & Environmental Science, 1062, 012027. doi: 10.1088/1755-1315/1062/1/012027

Conference Contribution - Published proceedings: Abstract

Sheridan, K. J., Eaton-Rye, J. J., & Summerfield, T. C. (2022). Characterisation of Synechocystis sp. PCC 6803 mutants that contain an introduced copy of psbA from a cyanobacterial gene cluster induced under far-red light. Proceedings of the International Society of Photosynthesis Research (ISPR) 18th International Congress on Photosynthesis Research. (pp. 266). Retrieved from https://www.ps2022.nz

Forsman, J. A., Brown, T. J., Sheridan, K. J., Summerfield, T. C., & Eaton-Rye, J. J. (2022). Partitioning of excitation energy between Photosystem II and Photosystem I is affected by mutations targeting the His-252 residue of the D1 subunit of Photosystem II. Proceedings of the International Society of Photosynthesis Research (ISPR) 18th International Congress on Photosynthesis Research. (pp. 247). Retrieved from https://www.ps2022.nz

Conference Contribution - Verbal presentation and other Conference outputs

McGovern, J. J., Nilsen, A. R., Summerfield, T. C., & Orlovich, D. A. (2022, May). Takahē, scouts for fungal diversity. Verbal presentation at the Fungal Network of New Zealand 35th New Zealand 'Virtual' Fungal Foray including the 20th Mycology Colloquium, [Online].

van Galen, L., Orlovich, D., Lord, J., Bohorquez, J., Nilsen, A., Summerfield, T., Dutoit, L., & Larcombe, M. (2022, May). Environment and host effects on New Zealand Nothofagus ectomycorrhizal fungal communities. Verbal presentation at the Fungal Network of New Zealand 35th New Zealand 'Virtual' Fungal Foray including the 20th Mycology Colloquium, [Online].

Nilsen, A. R., Chyou, D., Summerfield, T. C., Catcheside, D., Brown, C. M., & Orlovich, D. A. (2022, May). Molecular evolution of truffle like fungi in NZ: Clues from Leratiomyces. Verbal presentation at the Fungal Network of New Zealand 35th New Zealand 'Virtual' Fungal Foray including the 20th Mycology Colloquium, [Online].

2021

Journal - Research Article

Allen, R. J., Summerfield, T. C., Harvey, B. P., Agostini, S., Rastrick, S. P. S., Hall-Spencer, J. M., & Hoffmann, L. J. (2021). Species turnover underpins the effect of elevated CO₂ on biofilm communities through early succession. Climate Change Ecology, 2, 100017. doi: 10.1016/j.ecochg.2021.100017

Harvey, B. P., Allen, R., Agostini, S., Hoffmann, L. J., Kon, K., Summerfield, T. C., … Hall-Spencer, J. M. (2021). Feedback mechanisms stabilise degraded turf algal systems at a CO₂ seep site. Communications Biology, 4(1), 219. doi: 10.1038/s42003-021-01712-2

Nilsen, A. R., Macrae, O. C., Andrew, K., Wang, X. Y., Te Tana, M. C., Soop, K., Brown, C. M., Summerfield, T. C., & Orlovich, D. A. (2021). Studies of New Zealand Cortinarius: Resolution of taxonomic conflicts in section Subcastanelli (Agaricales), new species and key to rozitoid species. New Zealand Journal of Botany, 59(4), 457-475. doi: 10.1080/0028825X.2021.1879877

Journal - Research Other

Lea-Smith, D. J., Summerfield, T. C., Ducat, D. C., Lu, X., McCormick, A. J., & Purton, S. (2021). Exploring the growing role of cyanobacteria in industrial biotechnology and sustainability. Frontiers in Microbiology, 12, 725128. doi: 10.3389/fmicb.2021.725128

Conference Contribution - Published proceedings: Abstract

Nilsen, A., Chyou, D., Summerfield, T., Catcheside, D., Brown, C., & Orlovich, D. (2021). Molecular evolution of truffle like fungi in NZ: Clues from comparative genomics. Proceedings of the 16th Congress of the Federation of Asian & Oceanic Biochemists & Molecular Biologists (FAOBMB). (pp. 220). Retrieved from https://www.faobmb2021.org

Orlovich, D. A., van Galen, L. G., Nilsen, A. R., Larcombe, M. J., Lord, J. M., Summerfield, T. C., & Brown, C. M. (2021). eDNA for detecting data-deficient fungi. Proceedings of the 16th Congress of the Federation of Asian & Oceanic Biochemists & Molecular Biologists (FAOBMB). (pp. 89). Retrieved from https://www.faobmb2021.org

Orlovich, D. A., Nilsen, A. R., McGovern, J., Lasham, S., Williams, D., van Galen, L. G., Summerfield, T. C., Larcombe, M. J., Lord, J. M., & Brown, C. M. (2021). Bush genomics: Using genetics and genomics tools to discover and understand New Zealand's truffle-like fungi [Invited]. Proceedings of the Genetics Otago (GO) Annual Symposium. Retrieved from https://blogs.otago.ac.nz/go

2020

Journal - Research Article

Allen, R., Hoffmann, L. J., Larcombe, M. J., Louisson, Z., & Summerfield, T. C. (2020). Homogeneous environmental selection dominates microbial community assembly in the oligotrophic South Pacific Gyre. Molecular Ecology, 29, 4680-4691. doi: 10.1111/mec.15651

Allen, R., Summerfield, T. C., Currie, K., Dillingham, P. W., & Hoffmann, L. J. (2020). Distinct processes structure bacterioplankton and protist communities across an oceanic front. Aquatic Microbial Ecology, 85, 19-34. doi: 10.3354/ame01938

Forsman, J. A., Fagerlund, R. D., Biswas, S., Summerfield, T. C., & Eaton-Rye, J. J. (2020). The PsbT protein modifies the bicarbonate-binding environment of Photosystem II. New Zealand Journal of Botany, 58(4), 406-421. doi: 10.1080/0028825X.2020.1772320

Feng, Y., Roleda, M. Y., Armstrong, E., Summerfield, T. C., Law, C. S., Hurd, C. L., & Boyd, P. W. (2020). Effects of multiple drivers of ocean global change on the physiology and functional gene expression of the coccolithophore Emiliania huxleyi. Global Change Biology, 26, 5630-5645. doi: 10.1111/gcb.15259

Sheridan, K. J., Duncan, E. J., Eaton-Rye, J. J., & Summerfield, T. C. (2020). The diversity and distribution of D1 proteins in cyanobacteria. Photosynthesis Research, 145(2), 111-128. doi: 10.1007/s11120-020-00762-7

Ludwig, L. R., Kantvilas, G., Nilsen, A. R., Orlovich, D. A., Ohmura, Y., Summerfield, T. C., … Lord, J. M. (2020). A molecular-genetic reassessment of the circumscription of the lichen genus Icmadophila. Lichenologist, 52(3), 213-220. doi: 10.1017/S0024282920000122

Fagerlund, R. D., Forsman, J. A., Biswas, S., Vass, I., Davies, F. K., Summerfield, T. C., & Eaton-Rye, J. J. (2020). Stabilization of Photosystem II by the PsbT protein impacts photodamage, repair and biogenesis. Biochimica et Biophysica Acta: Bioenergetics, 1861, 148234. doi: 10.1016/j.bbabio.2020.148234

Nilsen, A. R., Wang, X. Y., Soop, K., Cooper, J. A., Ridley, G. S., Wallace, M., Summerfield, T. C., Brown, C. M., & Orlovich, D. A. (2020). Purple haze: Cryptic purple sequestrate Cortinarius in New Zealand. Mycologia, 112(3), 588-605. doi: 10.1080/00275514.2020.1730120

Allen, R., Hoffmann, L. J., Law, C. S., & Summerfield, T. C. (2020). Subtle bacterioplankton community responses to elevated CO₂ and warming in the oligotrophic South Pacific Gyre. Environmental Microbiology Reports, 12(4), 377-386. doi: 10.1111/1758-2229.12844

Nilsen, A. R., Teasdale, S. E., Guy, P. L., Summerfield, T. C., & Orlovich, D. A. (2020). Fungal diversity in canopy soil of silver beech, Nothofagus menziesii (Nothofagaceae). PLoS ONE, 15(1), e0227860. doi: 10.1371/journal.pone.0227860

Journal - Research Other

Eaton-Rye, J. J., Guieysse, B., Packer, M. A., Summerfield, T. C., & Wood, S. A. (2020). Biology and biotechnological applications of microalgae and photosynthetic prokaryotes: Part 2. New Zealand Journal of Botany, 58(4), 275-277. doi: 10.1080/0028825X.2020.1856887

Conference Contribution - Published proceedings: Abstract

Summerfield, T. (2020). Investigating microbial communities: Assembly and the impact of environmental stressors [Invited]. Proceedings of the Genetics Otago (GO) Zoom Symposium. Retrieved from https://blogs.otago.ac.nz/go/2020-3/

2019

Journal - Research Article

Salis, R. K., Bruder, A., Piggott, J. J., Summerfield, T. C., & Matthaei, C. D. (2019). Multiple-stressor effects of dicyandiamide (DCD) and agricultural stressors on trait-based responses of stream benthic algal communities. Science of the Total Environment, 693, 133305. doi: 10.1016/j.scitotenv.2019.07.111

Nilsen, A. R., Brown, C. M., Summerfield, T. C., & Orlovich, D. A. (2019). Cortinarius atropileatus sp. nov. (Cortinariaceae) from New Zealand. New Zealand Journal of Botany, 57(1), 50-61. doi: 10.1080/0028825X.2018.1548493

Morris, J. N., Kovács, S., Vass, I., Summerfield, T. C., & Eaton-Rye, J. J. (2019). Environmental pH and Glu364 to Gln mutation in the chlorophyll-binding CP47 protein affect redox-active TyrD and charge recombination in Photosystem II. FEBS Letters, 593, 163-174. doi: 10.1002/1873-3468.13307

Journal - Research Other

Eaton-Rye, J. J., Guieysse, B., Packer, M. A., Summerfield, T. C., & Wood, S. A. (2019). Biology and biotechnological applications of microalgae and photosynthetic prokaryotes: Part 1. New Zealand Journal of Botany, 57(2), 65-69. doi: 10.1080/0028825X.2019.1625558

Conference Contribution - Published proceedings: Abstract

Orlovich, D. A., Nilsen, A. R., Summerfield, T. C., Brown, C. M., Ohlemüller, R., van Galen, L., Larcombe, M., & Lord, J. (2019). Using genomics tools to understand beech forests and their fungi. Proceedings of the Joint Conference of the Australasian Systematic Botany Society (ASBS) and the New Zealand Plant Conservation Network (NZPCN): Taxonomy for Plant Conservation: Ruia mai i Rangiātea. (pp. 38). Retrieved from https://systematics.ourplants.org

Allen, R., Summerfield, T. C., Harvey, B., Agostini, S., & Hoffmann, L. J. (2019). Biofilm succession in an acidified ocean: Mechanistic insights from a volcanic CO₂ seep study. Proceedings of the 12th New Zealand Ocean Acidification Workshop. (pp. 12). Retrieved from http://nzoac.nz

Summerfield, T. C., Morris, J. N., Pearson, T., Sheridan, K., & Eaton-Rye, J. J. (2019). Characterisation of pH sensitive Photosystem II mutants in Synechocystis sp. PCC 6803. In S. Allakhverdiev & I. Naydov (Eds.), Proceedings of the 10th International Photosynthesis and Hydrogen Energy Research for Sustainability Conference. (pp. 141). Retrieved from https://icprs.ru

Sheridan, K. J., Eaton-Rye, J. J., & Summerfield, T. C. (2019). Characterisation of a phylogenetically distinct group of D1 proteins from cyanobacteria. In S. Allakhverdiev & I. Naydov (Eds.), Proceedings of the 10th International Photosynthesis and Hydrogen Energy Research for Sustainability Conference. (pp. 68). Retrieved from https://icprs.ru

2018

Conference Contribution - Published proceedings: Abstract

Orlovich, D. A., Nilsen, A. R., Teasdale, S. E., Guy, P. L., & Summerfield, T. C. (2018). Detecting and identifying ectomycorrhizal fungi in New Zealand silver beech (Lophozonia menziesii, Nothofagaceae) forest: A case study. Biodiversity Information Science & Standards, 2, e25982. doi: 10.3897/biss.2.25982

Morris, J. N., Crawford, T. S., Pearson, T., Lim, E. G., Eaton-Rye, J. J., & Summerfield, T. C. (2018). Investigating genetic instability in cyanobacteria. Proceedings of the New Zealand Microbiological Society (NZMS) New Zealand Society for Biochemistry and Molecular Biology (NZSBMB) Joint Annual Conference: Microbes & Molecules. (pp. 56-57). Retrieved from https://www.nzmsconference.org.nz

Nilsen, A., Summerfield, T., Brown, C., & Orlovich, D. (2018). Evolution of sequestrate fungi in New Zealand, with emphasis on the genus Cortinarius. Proceedings of the New Zealand Microbiological Society (NZMS) New Zealand Society for Biochemistry and Molecular Biology (NZSBMB) Joint Annual Conference: Microbes & Molecules. (pp. 56). Retrieved from https://www.nzmsconference.org.nz

Orlovich, D. A., Nilsen, A. R., Kahlert, B. C., Teasdale, S. E., Guy, P. L., & Summerfield, T. C. (2018). Microbial diversity in aerial "canopy soil" microhabitats. Proceedings of the New Zealand Microbiological Society (NZMS) New Zealand Society for Biochemistry and Molecular Biology (NZSBMB) Joint Annual Conference: Microbes & Molecules. (pp. 54). Retrieved from https://www.nzmsconference.org.nz

Brown, C., Chyou, T.-y., Lim, C. S., Padilla, E., Nilsen, A., Liu, S., … Summerfield, T., … Orlovich, D. (2018). The functions of non-coding RNAs and elements in fungal genomes: New roles in the regulation of gene expression. Proceedings of the New Zealand Microbiological Society (NZMS) New Zealand Society for Biochemistry and Molecular Biology (NZSBMB) Joint Annual Conference: Microbes & Molecules. (pp. 53). Retrieved from https://www.nzmsconference.org.nz

Allen, R., Rudminat, F., Law, C., Hoffmann, L., & Summerfield, T. (2018). Bacterioplankton resistance to acidification and warming in the oligotrophic ocean. Proceedings of the 11th New Zealand Ocean Acidification Workshop. (pp. 7). Retrieved from http://nzoac.nz

2017

Journal - Research Article

Ludwig, L., Summerfield, T. C., Lord, J. M., & Singh, G. (2017). Characterization of the mating-type locus (MAT) reveals a heterothallic mating system in Knightiella splachnirima. Lichenologist, 49(4), 373-385. doi: 10.1017/S0024282917000214

Griffith, J. C., Lee, W. G., Orlovich, D. A., & Summerfield, T. C. (2017). Contrasting bacterial communities in two indigenous Chionochloa (Poaceae) grassland soils in New Zealand. PLoS ONE, 12(6), e0179652. doi: 10.1371/journal.pone.0179652

Salis, R. K., Bruder, A., Piggott, J. J., Summerfield, T. C., & Matthaei, C. D. (2017). High-throughput amplicon sequencing and stream benthic bacteria: Identifying the best taxonomic level for multiple-stressor research. Scientific Reports, 7, 44657. doi: 10.1038/srep44657

Morris, J. N., Eaton-Rye, J. J., & Summerfield, T. C. (2017). Phenotypic variation in wild-type substrains of the model cyanobacterium Synechocystis sp. PCC 6803. New Zealand Journal of Botany, 55(1), 25-35. doi: 10.1080/0028825X.2016.1231124

Journal - Professional & Other Non-Research Articles

Packer, M. A., Eaton-Rye, J. J., Summerfield, T. C., Guieysse, B., & Wood, S. A. (2017). Introduction: Proceedings of the 2015 New Zealand symposium on algae and photosynthetic prokaryotes. New Zealand Journal of Botany, 55, 1-4. doi: 10.1080/0028825X.2016.1261908

Conference Contribution - Published proceedings: Abstract

Rudminat, F., Law, C., Hoffmann, L., & Summerfield, T. (2017). Bacterioplankton community response to elevated CO₂ and/or temperature in the South Pacific. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 26). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html

Allen, R., Hoffmann, L., & Summerfield, T. (2017). The ecological and evolutionary importance of genetic diversity in phytoplankton responses to ocean acidification. Proceedings of the 10th New Zealand Ocean Acidification Workshop. (pp. 11). Retrieved from http://www.otago.ac.nz/oceanacidification/news/index.html

2016

Journal - Research Article

Morris, J. N., Eaton-Rye, J. J., & Summerfield, T. C. (2016). Environmental pH and the requirement for the extrinsic proteins of Photosystem II in the function of cyanobacterial photosynthesis. Frontiers in Plant Science, 7, 1135. doi: 10.3389/fpls.2016.01135

Crawford, T. S., Eaton-Rye, J. J., & Summerfield, T. C. (2016). Mutation of Gly195 of the ChlH subunit of Mg-chelatase reduces chlorophyll and further disrupts PS II assembly in a Ycf48-deficient strain of Synechocystis sp. PCC 6803. Frontiers in Plant Science, 7, 1060. doi: 10.3389/fpls.2016.01060

Secker, N. H., Chua, J. P. S., Laurie, R. E., McNoe, L., Guy, P. L., Orlovich, D. A., & Summerfield, T. C. (2016). Characterization of the cyanobacteria and associated bacterial community from an ephemeral wetland in New Zealand. Journal of Phycology, 52(5), 761-773. doi: 10.1111/jpy.12434

Crawford, T. S., Hanning, K. R., Chua, J. P. S., Eaton-Rye, J. J., & Summerfield, T. C. (2016). Comparison of D1´- and D1-containing PS II reaction centre complexes under different environmental conditions in Synechocystis sp. PCC 6803. Plant, Cell & Environment, 39, 1715-1726. doi: 10.1111/pce.12738

Conference Contribution - Published proceedings: Abstract

Orlovich, D. A., Gillard, G., Wang, X., Nilsen, A. R., Brown, C. M., & Summerfield, T. C. (2016). Comparative genomics of a truffle-like fungus Cortinarius beeverorum and its close mushroom relative C. dulciolens. Proceedings of the Scientific Meeting of the Australasian Mycological Society (AMS) with the Fungal Network of New Zealand (FUNNZ). (pp. 14). Retrieved from https://www.australasianmycologicalsociety.com

2015

Conference Contribution - Published proceedings: Abstract

Crawford, T., Eaton-Rye, J., & Summerfield, T. (2015). Cyanobacterial biofuels: The next generation. Proceedings of the Otago Energy Research Centre (OERC) Symposium. (pp. 17). Retrieved from http://www.otago.ac.nz/oerc/

Orlovich, D. A., Summerfield, T. C., & Kahlert, B. C. (2015). Microbial diversity in kahikatea (Dacrycarpus dacrydioides) and silver beech (Lophozonia menziesii) canopy and terrrestrial soils. Proceedings of the New Zealand Microbiological Society (NZMS) 60th Conference. (pp. 46). Retrieved from http://www.nzmsconference.org.nz/

Conference Contribution - Verbal presentation and other Conference outputs

Summerfield, T. (2015, November). Toxin-producing cyanobacteria. Verbal presentation at the Toxicology Symposium: Toxicology for the Modern Researcher, Dunedin, New Zealand.

2014

Journal - Research Article

Wall, J. M., Wood, S. A., Orlovich, D. A., Rhodes, L. L., & Summerfield, T. C. (2014). Characterisation of freshwater and marine cyanobacteria in the Hokianga region, Northland, New Zealand. New Zealand Journal of Marine & Freshwater Research, 48(2), 177-193. doi: 10.1080/00288330.2013.854814

Chua, J. P. S., Orlovich, D. A., & Summerfield, T. C. (2014). Cyanobacteria in New Zealand indigenous grasslands. New Zealand Journal of Botany, 52(1), 100-115. doi: 10.1080/0028825X.2013.862554

Luo, H., Jackson, S. A., Fagerlund, R. D., Summerfield, T. C., & Eaton-Rye, J. J. (2014). The importance of the hydrophilic region of PsbL for the plastoquinone electron acceptor complex of Photosystem II. Biochimica et Biophysica Acta: Bioenergetics, 1837(9), 1435-1446. doi: 10.1016/j.bbabio.2014.02.015

Morris, J. N., Crawford, T. S., Jeffs, A., Stockwell, P. A., Eaton-Rye, J. J., & Summerfield, T. C. (2014). Whole genome re-sequencing of two ‘wild-type’ strains of the model cyanobacterium Synechocystis sp. PCC 6803. New Zealand Journal of Botany, 52(1), 36-47. doi: 10.1080/0028825X.2013.846267

Journal - Professional & Other Non-Research Articles

Eaton-Rye, J. J., Packer, M. A., Summerfield, T. C., & Wood, S. A. (2014). Algal and cyanobacterial bioenergy and diversity. New Zealand Journal of Botany, 52(1), 1-5. doi: 10.1080/0028825X.2013.877947

Conference Contribution - Published proceedings: Abstract

Chua, J. P. S., Secker, N. H., Lee, W. G., Orlovich, D. A., & Summerfield, T. C. (2014). Characterisation of the cyanobacterial community from New Zealand ephemeral wetland and native grasslands. Proceedings of the 9th European Workshop on the Molecular Biology of Cyanobacteria. (pp. 133). Retrieved from https://www.nioz.nl/files/afdelingen/YMM/9EWMBC/9EWMBC-Program%20Book.pdf

Conference Contribution - Verbal presentation and other Conference outputs

Chua, J., Orlovich, D., Lee, W., & Summerfield, T. (2014, August). Exploring the diversity and abundance of bacterial community in New Zealand grassland soils using 16S rRNA and nifH amplicon sequencing on the Illumina MiSeq. Verbal presentation at the 15th International Symposium on Microbial Ecology (ISME15), Seoul, South Korea.

2013

Journal - Research Article

Summerfield, T. C., Crawford, T. S., Young, R. D., Chua, J. P. S., Macdonald, R. L., Sherman, L. A., & Eaton-Rye, J. J. (2013). Environmental pH affects photoautotrophic growth of Synechocystis sp. PCC 6803 strains carrying mutations in the lumenal proteins of PSII. Plant & Cell Physiology, 54(6), 859-874. doi: 10.1093/pcp/pct036

Journal - Research Other

Summerfield, T. C. (2013). [Review of the book Plastid biology, energy conversion and carbon assimilation (Advances in photosynthesis and respiration, Vol. 34)]. New Zealand Journal of Botany, 51(2), 145-146. doi: 10.1080/0028825X.2012.757755

Conference Contribution - Published proceedings: Full paper

Summerfield, T. C., Young, R., Sherman, L. A., & Eaton-Rye, J. J. (2013). Characterization of a pH-sensitive Photosystem II mutant in the cyanobacterium Synechocystis sp. PCC 6803. In T. Kuang, C. Lu & L. Zhang (Eds.), Photosynthesis Research for Food, Fuel and the Future: 15th International Conference on Photosynthesis. (pp. 348-352). Berlin, Germany: Springer. doi: 10.1007/978-3-642-32034-7_73

Conference Contribution - Poster Presentation (not in published proceedings)

Summerfield, T., Crawford, T. S., Young, R. D., Chua, J. P. S., Macdonald, R., Sherman, L. A., & Eaton-Rye, J. J. (2013, August). Environmental pH alters growth of Photosystem II mutants in Synechocystis sp. PCC 6803. Poster session presented at the 16th International Congress on Photosynthesis, St. Louis, MO.

2012

Chapter in Book - Research

Summerfield, T. C., Toepel, J., & Sherman, L. A. (2012). Transcriptional response to low-O₂ conditions in Synechocystis sp. strain PCC 6803 includes induction of a gene cluster containing psbA and petC2. In S. Itoh, P. Mohanty & K. N. Guruprasad (Eds.), Photosynthesis: Overviews on recent progress and future perspectives. (pp. 120-129). New Delhi, India: I. K. International.

Journal - Research Article

Chua, J. P. S., Wallace, E. J. S., Yardley, J. A., Duncan, E. J., Dearden, P. K., & Summerfield, T. C. (2012). Gene expression indicates a zone of heterocyst differentiation within the thallus of the cyanolichen Pseudocyphellaria crocata. New Phytologist, 196(3), 862-872. doi: 10.1111/j.1469-8137.2012.04272.x

Conference Contribution - Published proceedings: Abstract

Chua, J. P. S., Wallace, E. J. S., Yardley, J. A., & Summerfield, T. C. (2012). Gene expression indicates a zone of heterocyst differentiation within the thallus of the cyanolichen Pseudocyphellaria crocata. Proceedings of the 14th International Symposium on Phototrophic Prokaryotes (ISPP). (pp. 103). Retrieved from http://www.ibmc.up.pt/ispp2012/

Ludwig, L. R., Lord, J. M., Burritt, D. J., & Summerfield, T. C. (2012). The reproductive ecology of Icmadophila splachnirima: A rate Australasian lichen exhibiting sexual and asexual reproduction. Proceedings of the 7th International Association for Lichenology Symposium: Lichens: From Genome to Ecosystems in a Changing World. (pp. 45). Bangkok, Thailand: Ramkhamhaeng University Press. [Abstract]

2011

Journal - Research Article

Summerfield, T. C., Nagarajan, S., & Sherman, L. A. (2011). Gene expression under low-oxygen conditions in the cyanobacterium Synechocystis sp. PCC 6803 demonstrates Hik31 -dependent and -independent responses. Microbiology, 157(2), 301-312. doi: 10.1099/mic.0.041053-0

2010

Conference Contribution - Published proceedings: Abstract

Bayer, T., Schallenberg, M., Burns, C., & Summerfield, T. (2010). Drivers of phytoplankton production and biomass in ultra-oligotrophic Lakes Wanaka & Wakatipu. Proceedings of the New Zealand Freshwater Sciences Society (NZFSS) Annual Conference: Freshwater Solutions Going Beyond the Problem. Retrieved from http://freshwater.science.org.nz/index.php/events/nzfss-conference-proceedings/

Crawford, T., Eaton-Rye, J., & Summerfield, T. (2010). Cyanobacterial hydrogen production under low oxygen conditions. Proceedings of the Otago Energy Research Centre (OERC) Symposium: Energy Future. Retrieved from http://www.otago.ac.nz/oerc/

2009

Journal - Research Article

Shcolnick, S., Summerfield, T. C., Reytman, L., Sherman, L. A., & Keren, N. (2009). The mechanism of iron homeostasis in the unicellular cyanobacterium Synechocystis sp. PCC 6803 and its relationship to oxidative stress. Plant Physiology, 150(4), 2045-2056. doi: 10.1104/pp.109.141853

Toepel, J., McDermott, J. E., Summerfield, T. C., & Sherman, L. A. (2009). Transcriptional analysis of the unicellular, diazotrophic cyanobacterium Cyanothece sp. ATCC 51142 grown under short day/night cycles. Journal of Phycology, 45(3), 610-620. doi: 10.1111/j.1529-8817.2009.00674.x

Conference Contribution - Verbal presentation and other Conference outputs

Summerfield, T. (2009, November). Cyanobacteria: Making hydrogen while the sun shines. Invited presentation at the Genetics Otago Postgraduate Symposium, Dunedin, New Zealand.

2008

Journal - Research Article

Toepel, J., Welsh, E., Summerfield, T. C., Pakrasi, H. B., & Sherman, L. A. (2008). Differential transcriptional analysis of the cyanobacterium Cyanothece sp. strain ATCC 51142 during light-dark and continuous-light growth. Journal of Bacteriology, 190(11), 3904-3913. doi: 10.1128/JB.00206-08

Summerfield, T. C., & Sherman, L. A. (2008). Global transcriptional response of the alkali-tolerant cyanobacterium Synechocystis sp. strain PCC 6803 to a pH 10 environment. Applied & Environmental Microbiology, 74(17), 5276-5284. doi: 10.1128/AEM.00883-08

Summerfield, T. C., Toepel, J., & Sherman, L. A. (2008). Low-oxygen induction of normally cryptic psbA genes in cyanobacteria. Biochemistry, 47, 12939-12941.

Conference Contribution - Published proceedings: Abstract

Summerfield, T., & Sherman, L. (2008). Using a model cyanobacterium to investigate the transcriptional response to changing environments. Proceedings of the 8th Annual Australasian Microarray and Associated Technologies (AMATA) Conference. Retrieved from http://www.amata.org.au/index.php/resources/2008-conference-abstracts

2007

Journal - Research Article

Summerfield, T. C., & Sherman, L. A. (2007). Role of sigma factors in controlling global gene expression in light/dark transitions in the cyanobacterium Synechocystis sp. strain PCC 6803. Journal of Bacteriology, 189(21), 7829-7840. doi: 10.1128/JB.01036-07

Summerfield, T. C., Eaton-Rye, J. J., & Sherman, L. A. (2007). Global gene expression of a ΔPsbO:ΔPsbU mutant and a spontaneous revertant in the cyanobacterium Synechocystis sp. strain PCC 6803. Photosynthesis Research, 94, 265-274.

2006

Journal - Research Article

Singh, A. K., Summerfield, T. C., Li, H., & Sherman, L. A. (2006). The heat shock response in the cyanobacterium Synechocystis sp. strain PCC 6803 and regulation of gene expression by HrcA and SigB. Archives of Microbiology, 186(4), 273-286. doi: 10.1007/s00203-006-0138-0

Summerfield, T. C., & Eaton-Rye, J. J. (2006). Pseudocyphellaria crocata, P. neglecta and P. perpetua from the Northern and Southern Hemispheres are a phylogenetic species and share cyanobionts. New Phytologist, 170, 597-607.

2005

Journal - Research Article

Summerfield, T. C., Winter, R. T., & Eaton-Rye, J. J. (2005). Investigation of a requirement for the PsbP-like protein in Synechocystis sp. PCC 6803. Photosynthesis Research, 84, 263-268.

Summerfield, T. C., Shand, J. A., Bentley, F. K., & Eaton-Rye, J. J. (2005). PsbQ (SII1638) in Synechocystis sp. PCC 6803 is required for photosystem II activity in specific mutants and in nutrient-limiting conditions. Biochemistry, 44, 805-815.

Conference Contribution - Published proceedings: Full paper

Summerfield, T. C., & Eaton-Rye, J. J. (2005). Removal of the PsbQ-like protein (SII1638) in nutrient-limiting conditions and in strains lacking PsbO, PsbU, or PsbV. In A. van der Est & D. Bruce (Eds.), Proceedings of the 13th International Congress of Photosynthesis. 1, (pp. 336-338). Lawrence, KS, USA: Alliance Communications Group. [Full Paper]

2002

Journal - Research Article

Summerfield, T., Galloway, D. J., & Eaton-Rye, J. J. (2002). Species of cyanolichens from Pseudocyphellaria with indistinguishable ITS sequences have different photobionts. New Phytologist, 155, 121-129.

2001

Journal - Research Article

Mouchel, N., Tebbutt, S. J., Broackes-Carter, F. C., Sahota, V., Summerfield, T., Gregory, D. J., & Harris, A. (2001). The sheep genome contributes to localization of control elements in a human gene with complex regulatory mechanisms. Genomics, 76, 9-13.

Conference Contribution - Published proceedings: Abstract

Summerfield, T. C., Galloway, D. J., & Eaton-Rye, J. J. (2001). The use of psbB for the identification of cyanobacterial lichen symbionts. PS2001 Proceedings of the 12th International Congress on Photosynthesis. (S3-041), (pp. 1-4). Victoria: CSIRO Publishing. [Abstract]