Titel
Adjustment of photosynthetic activity to drought and fluctuating light in wheat
Autor*in
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Abstract
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.
Stichwort
breedingcropdroughtlight harvesting complex IINPQphotosynthesisphotosystem IIprotein phosphorylationwheat
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1218497
Erschienen in
Titel
Plant, Cell & Environment
Band
43
Ausgabe
6
ISSN
0140-7791
Erscheinungsdatum
2020
Seitenanfang
1484
Seitenende
1500
Publication
Wiley
Fördergeber
Austrian Science Fund (FWF) — P 28491
Erscheinungsdatum
2020
Zugänglichkeit
Rechte
Rechteangabe
© 2020 The Authors
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