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Wheat photosystem II heat tolerance responds dynamically to short and long-term warming

View ORCID ProfileBradley C. Posch, Julia Hammer, View ORCID ProfileOwen K. Atkin, View ORCID ProfileHelen Bramley, View ORCID ProfileYong-Ling Ruan, View ORCID ProfileRichard Trethowan, View ORCID ProfileOnoriode Coast
doi: https://doi.org/10.1101/2021.11.01.466822
Bradley C. Posch
1ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
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Julia Hammer
1ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
2Department of Biology, The University of Western Ontario, 1151 Richmond St., N6A 3K7, London, Canada
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Owen K. Atkin
1ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
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Helen Bramley
3Plant Breeding Institute, Sydney Institute of Agriculture & School of Life and Environmental Sciences, The University of Sydney, Narrabri, NSW 2390, Australia
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Yong-Ling Ruan
4Australia-China Research Centre for Crop Improvement and School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
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Richard Trethowan
3Plant Breeding Institute, Sydney Institute of Agriculture & School of Life and Environmental Sciences, The University of Sydney, Narrabri, NSW 2390, Australia
5School of Life and Environmental Sciences, Plant Breeding Institute, Sydney Institute of Agriculture, The University of Sydney, Cobbitty, NSW 2570, Australia
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Onoriode Coast
1ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
6Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom
7School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia
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  • For correspondence: ocoast@une.edu.au
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Abstract

Heat-induced inhibition of photosynthesis is a key factor in declining wheat performance and yield. Variation in wheat heat tolerance can be characterised using the critical temperature (Tcrit) above which incipient damage to the photosynthetic machinery occurs. We investigated intraspecies variation and plasticity of wheat Tcrit under elevated temperature in field and controlled environment experiments. We also assessed whether intraspecies variation in wheat Tcrit mirrors patterns of global interspecies variation in heat tolerance reported for mostly wild, woody plants. In the field, wheat Tcrit varied through the course of a day, peaking at noon and lowest at sunrise, and increased as plants developed from heading to anthesis and grain filling. Under controlled temperature conditions, heat stress (36°C) was associated with a rapid rise in wheat Tcrit (i.e. within two hours of heat stress) that peaked after 3–4 days. These peaks in Tcrit indicate a physiological limitation to photosystem II heat tolerance. Analysis of a global dataset (comprising 183 Triticum and wild wheat (Aegilops) species) generated from the current study and a systematic literature review showed that wheat leaf Tcrit varied by up to 20°C (about two-thirds of reported global plant interspecies variation). However, unlike global patterns of interspecies Tcrit variation which has been linked to latitude of genotype origin, intraspecific variation in wheat Tcrit was unrelated to that. Yet, the observed genotypic variation and plasticity of wheat Tcrit suggests that this trait could be a useful tool for high-throughput phenotyping of wheat photosynthetic heat tolerance.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Author email addresses: Bradley C. Posch: brad.posch{at}anu.edu.au; Julia Hammer: jhammer2{at}uwo.ca; Owen K. Atkin: owen.atkin{at}anu.edu.au; Helen Bramley: helbramley{at}gmail.com; Yong-Ling Ruan: yong-ling.ruan{at}newcastle.edu.au; Richard Trethowan: richard.trethowan{at}sydney.edu.au; Onoriode Coast: ocoast{at}une.edu.au

  • Funding ARC Centre of Excellence in Plant Energy Biology (CE140100008); Australian Grains Research and Development Corporation (GRDC) Postdoctoral Fellowship: Photosynthetic Acclimation to High Temperature in Wheat (US1904-003RTX – 9177346) and National Wheat Heat Tolerance Project (US00080), and Australian Research Council (DP180103834).

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted November 04, 2021.
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Wheat photosystem II heat tolerance responds dynamically to short and long-term warming
Bradley C. Posch, Julia Hammer, Owen K. Atkin, Helen Bramley, Yong-Ling Ruan, Richard Trethowan, Onoriode Coast
bioRxiv 2021.11.01.466822; doi: https://doi.org/10.1101/2021.11.01.466822
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Wheat photosystem II heat tolerance responds dynamically to short and long-term warming
Bradley C. Posch, Julia Hammer, Owen K. Atkin, Helen Bramley, Yong-Ling Ruan, Richard Trethowan, Onoriode Coast
bioRxiv 2021.11.01.466822; doi: https://doi.org/10.1101/2021.11.01.466822

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