Drought affects both photosystems in Arabidopsis thaliana - Biologie du chloroplaste et perception de la lumière chez les micro-algues Accéder directement au contenu
Article Dans Une Revue (Data Paper) New Phytologist Année : 2023

Drought affects both photosystems in Arabidopsis thaliana

Résumé

Drought is a major abiotic stress that impairs plant growth and development. Despite this, a comprehensive understanding of drought effects on the photosynthetic apparatus is lacking. In this work, we studied the consequences of 14‐d drought treatment on Arabidopsis thaliana . We used biochemical and spectroscopic methods to examine photosynthetic membrane composition and functionality. Drought led to the disassembly of PSII supercomplexes and the degradation of PSII core. The light‐harvesting complexes (LHCII) instead remain in the membrane but cannot act as an antenna for active PSII, thus representing a potential source of photodamage. This effect can also be observed during nonphotochemical quenching (NPQ) induction when even short pulses of saturating light can lead to photoinhibition. At a later stage, under severe drought stress, the PSI antenna size is also reduced and the PSI‐LHCI supercomplexes disassemble. Surprisingly, although we did not observe changes in the PSI core protein content, the functionality of PSI is severely affected, suggesting the accumulation of nonfunctional PSI complexes. We conclude that drought affects both photosystems, although at a different stage, and that the operative quantum efficiency of PSII (Φ PSII ) is very sensitive to drought and can thus be used as a parameter for early detection of drought stress.
Fichier principal
Vignette du fichier
2023 Hu Drought affects both photosystems in Arabidopsis thaliana.pdf (6.61 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04251036 , version 1 (20-10-2023)

Identifiants

Citer

Chen Hu, Eduard Elias, Wojciech Jacek Nawrocki, Roberta Croce. Drought affects both photosystems in Arabidopsis thaliana. New Phytologist, 2023, 240 (2), pp.663-675. ⟨10.1111/nph.19171⟩. ⟨hal-04251036⟩
10 Consultations
29 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More