期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 73, 期 10, 页码 3268-3282出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erac039
关键词
Acclimation; chlorophyll fluorescence; heat stress; phenotypic plasticity; photosynthesis; photosystem II; thermotolerance; Triticum species
资金
- ARC Centre of Excellence in Plant Energy Biology [CE140100008]
- Australian Grains Research and Development Corporation (GRDC) projects Postdoctoral Fellowship: Photosynthetic Acclimation [US1904003RTX -9177346]
- National Wheat Heat Tolerance [US00080]
- Australian Research Council [DP180103834]
- Australian Government Research Training Program
- Research England's `Expanding Excellence in England'
- Nutrition Security Initiative of the Natural Resources Institute, University of Greenwich
Wheat photosynthetic heat tolerance can be quantified using minimal chlorophyll fluorescence to measure the critical temperature. We investigated the intraspecies variation and plasticity of wheat T-crit under elevated temperature and found it to be unrelated to global patterns of interspecies heat tolerance. The observed genotypic variation and plasticity suggest that T-crit could be a useful trait for phenotyping wheat photosynthetic heat tolerance.
Wheat photosynthetic heat tolerance can be characterized using minimal chlorophyll fluorescence to quantify the critical temperature (T-crit) above which incipient damage to the photosynthetic machinery occurs. We investigated intraspecies variation and plasticity of wheat T-crit under elevated temperature in field and controlled-environment experiments, and assessed whether intraspecies variation mirrored interspecific patterns of global heat tolerance. In the field, wheat T-crit varied diurnally-declining from noon through to sunrise-and increased with phenological development. Under controlled conditions, heat stress (36 degrees C) drove a rapid (within 2 h) rise in T-crit that peaked after 3-4 d. The peak in T-crit 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 T-crit varied by up to 20 degrees C (roughly two-thirds of reported global plant interspecies variation). However, unlike global patterns of interspecies T-crit variation that have been linked to latitude of genotype origin, intraspecific variation in wheat T-crit was unrelated to that. Overall, the observed genotypic variation and plasticity of wheat T-crit suggest that this trait could be useful in high-throughput phenotyping of wheat photosynthetic heat tolerance. Heat tolerance of wheat PSII was highly plastic in response to changing growth conditions. An upper limit to increasing heat tolerance was identified following a short-term heat stress.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据