期刊
PLANT CELL AND ENVIRONMENT
卷 43, 期 6, 页码 1484-1500出版社
WILEY
DOI: 10.1111/pce.13756
关键词
breeding; crop; drought; light harvesting complex II; NPQ; photosynthesis; photosystem II; protein phosphorylation; wheat
资金
- Academy of Finland Center of Excellence [307335]
- Alexander-von-Humboldt Foundation [FIN 1186355 HFST-P]
- Austrian Science Fund (FWF) [P 28491]
- Marie Curie ITN CALIPSO [GA ITN 2013 ITN-607 607]
- Austrian Science Fund (FWF) [P28491] Funding Source: Austrian Science Fund (FWF)
Drought is a major cause of losses in crop yield. Under field conditions, plants exposed to drought are usually also experiencing rapid changes in light intensity. Accordingly, plants need to acclimate to both, drought and light stress. Two crucial mechanisms in plant acclimation to changes in light conditions comprise thylakoid protein phosphorylation and dissipation of light energy as heat by non-photochemical quenching (NPQ). Here, we analyzed the acclimation efficacy of two different wheat varieties, by applying fluctuating light for analysis of plants, which had been subjected to a slowly developing drought stress as it usually occurs in the field. This novel approach allowed us to distinguish four drought phases, which are critical for grain yield, and to discover acclimatory responses which are independent of photodamage. In short-term, under fluctuating light, the slowdown of NPQ relaxation adjusts the photosynthetic activity to the reduced metabolic capacity. In long-term, the photosynthetic machinery acquires a drought-specific configuration by changing the PSII-LHCII phosphorylation pattern together with protein stoichiometry. Therefore, the fine-tuning of NPQ relaxation and PSII-LHCII phosphorylation pattern represent promising traits for future crop breeding strategies.
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