Posch, Bradley C, Hammer, Julia, Atkin, 0wen K, Bramley, Helen, Ruan, Yong-Ling, Trethowan, Richard and Coast, Onoriode ORCID: 0000-0002-5013-4715 (2022) Wheat photosystem II heat tolerance responds dynamically to short- and long-term warming. Journal of Experimental Botany, 73 (10). ISSN 0022-0957 (doi:https://doi.org/10.1093/jxb/erac039)

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Abstract

Wheat photosynthetic heat tolerance can be characterized using minimal chlorophyll fuorescence to quantify 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 feld and controlled-environment experiments, and assessed whether intraspecies variation mirrored interspecifc patterns of global heat tolerance. In the feld, wheat Tcrit varied diurnally—declining from noon through to sunrise—and increased with phenological de�velopment. Under controlled conditions, heat stress (36 °C) drove a rapid (within 2 h) rise in Tcrit that peaked after 3–4
d. The peak in Tcrit indicated an upper limit to PSII heat tolerance. 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 (roughly two-thirds of reported global plant interspecies variation). However, unlike global
patterns of interspecies Tcrit variation that have been linked to latitude of genotype origin, intraspecifc variation in
wheat Tcrit was unrelated to that. Overall, the observed genotypic variation and plasticity of wheat Tcrit suggest that
this trait could be useful in high-throughput phenotyping of wheat photosynthetic heat tolerance

Item Type:	Article
Uncontrolled Keywords:	Acclimation, chlorophyll fuorescence, heat stress, phenotypic plasticity, photosynthesis, photosystem II, thermotolerance, Triticum species.
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:	05 Sep 2022 16:02
URI:	http://gala.gre.ac.uk/id/eprint/37219

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