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Wheat photosystem II heat tolerance: evidence for genotype‐by‐environment interactions

Wheat photosystem II heat tolerance: evidence for genotype‐by‐environment interactions

Coast, Onoriode ORCID: 0000-0002-5013-4715, Posch, Bradley C. ORCID: 0000-0003-0924-6608, Rognoni, Bethany G. ORCID: 0000-0002-1082-4201, Bramley, Helen ORCID: 0000-0003-0251-2942, Gaju, Oorbessy ORCID: 0000-0003-0493-7354, Mackenzie, John ORCID: 0000-0001-8376-4871, Pickles, Claire, Kelly, Alison M. ORCID: 0000-0003-1554-3983, Lu, Meiqin ORCID: 0000-0003-4390-4600, Ruan, Yong‐Ling ORCID: 0000-0002-8394-4474, Trethowan, Richard ORCID: 0000-0003-0105-875X and Atkin, Owen K. ORCID: 0000-0003-1041-5202 (2022) Wheat photosystem II heat tolerance: evidence for genotype‐by‐environment interactions. The Plant Journal, 111 (5). pp. 1368-1382. ISSN 0960-7412 (doi:

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High temperature stress inhibits photosynthesis and threatens wheat production. One measure of photosynthetic heat tolerance is Tcrit – the critical temperature at which incipient damage to photosystem II (PSII) occurs. This trait could be improved in wheat by exploiting genetic variation and genotype-by-environment interactions (GEI). Flag leaf Tcrit of 54 wheat genotypes was evaluated in 12 thermal environments over 3 years in Australia, and analysed using linear mixed models to assess GEI effects. Nine of the 12 environments had significant genetic effects and highly variable broad-sense heritability (H2 ranged from 0.15 to 0.75). Tcrit GEI was variable, with 55.6% of the genetic variance across environments accounted for by the factor analytic model. Mean daily growth temperature in the month preceding anthesis was the most influential environmental driver of Tcrit GEI, suggesting biochemical, physiological and structural adjustments to temperature requiring different durations to manifest. These changes help protect or repair PSII upon exposure to heat stress, and may improve carbon assimilation under high temperature. To support breeding efforts to improve wheat performance under high temperature, we identified genotypes superior to commercial cultivars commonly grown by farmers, and demonstrated potential for developing genotypes with greater photosynthetic heat tolerance.

Item Type: Article
Uncontrolled Keywords: chlorophyll fluorescence, factor analytic models, heat stress, multi-environment trial, photosynthesis, photosynthetic thermal tolerance, Triticum
Subjects: Q Science > Q Science (General)
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Ecosystem Services Research Group
Last Modified: 06 Sep 2022 07:58

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