Long-term drought stress induces structural and functional reorganization of photosystem II

Long-term drought stress on photosystem II (PSII) was studied in pea (Pisum sativum L.) seedlings. Drought stress (reduction of water content by 35—80%) led to a considerable depletion of the PSII core, and the remaining PSII complex appeared to be functional and reorganized, with a unit size (LHCP/...

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Bibliographic Details
Published in:Planta 1996-05, Vol.199 (1), p.118-125
Main Authors: Giardi, M.T, Cona, A, Geiken, B, Kucera, T, Masojidek, J, Mattoo, A.K. (Italian National Council of Research, Monterotondo Scalo (Italy). Area della Ricerca di Roma)
Format: Article
Language:English
Subjects:
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Agronomy. Soil science and plant productions
Biological and medical sciences
BIOSINTESIS
BIOSYNTHESE
BIOSYNTHESIS
CHLOROPHYLLE
CHLOROPHYLLS
CLOROFILAS
Dehydration
Drought
DROUGHT STRESS
Economic plant physiology
ENVIRONMENTAL FACTORS
ENZIMAS
ENZYME
ENZYMES
ENZYMIC ACTIVITY
ESTRES
ESTRES DE SEQUIA
FACTEUR DU MILIEU
FACTORES AMBIENTALES
FEUILLE
FOSFORILACION
FOTOSINTESIS
FOTOSISTEMAS
Fundamental and applied biological sciences. Psychology
Gemuesebau
Grana
HERBICIDAS
HERBICIDE
HERBICIDES
HOJAS
Immunblotting
IMMUNOLOGICAL TECHNIQUES
LEAVES
LIGHT
LUMIERE
LUZ
Metabolism
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
Nutrition. Photosynthesis. Respiration. Metabolism
Peas
Pflanzenphysiologie
PHOSPHORYLATION
Photoinhibition
PHOTOSYNTHESE
PHOTOSYNTHESIS
Photosynthesis, respiration. Anabolism, catabolism
Photosystem II
PHOTOSYSTEME
PHOTOSYSTEMS
PISUM SATIVUM
Plant physiology and development
Plants
PLANTULAS
PLANTULE
PROTEIN SYNTHESIS
PROTEINAS
PROTEINE
PROTEINS
SEEDLINGS
SINTESIS DE PROTEINAS
STRESS
STRESS DU A LA SECHERESSE
SYNTHESE PROTEIQUE
TECHNIQUE IMMUNOLOGIQUE
TECNICAS INMUNOLOGICAS
Thylakoids
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Summary:Long-term drought stress on photosystem II (PSII) was studied in pea (Pisum sativum L.) seedlings. Drought stress (reduction of water content by 35—80%) led to a considerable depletion of the PSII core, and the remaining PSII complex appeared to be functional and reorganized, with a unit size (LHCP/PSII core) twofold greater than that of well-irrigated plants. By immunoblotting analysis of the PSII proteins from grana and stroma lamellae, the enhanced degradation of CP43 and D1 proteins was observed in water-stressed plants. Also, water stress caused increased phosphorylation of the PSII core and increased D1 protein synthesis. Water-stress-mediated increase in D1 synthesis did not occur when plants were exposed to photoinhibitory light. The depletion of the PSII core was essentially reversed when water-stressed plants grown at low visible irradiance were watered. We suggest that the syndrome caused by the effect of long-term water stress on photosynthesis is a combination of at least two events: a reduction in the number of active PSII centres caused by a physical destabilization of the PSII core and a PSII reorganization with enhanced D1 turnover to counteract the core depletion.
ISSN:0032-0935
1432-2048
DOI:10.1007/bf00196888