Document Detail


Brassinosteroids accelerate recovery of photosynthetic apparatus from chill stress by balancing the electron partitioning, carboxylation and redox homeostasis in cucumber.
MedLine Citation:
PMID:  22998725     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The aim of this study was to examine the role of brassinosteroids (BRs) in protecting the photosynthetic apparatus from chill-induced damage in cucumber (Cucumis sativus) plants. Recovery at both high light (HL) and low light (LL) after a chill at 10/7°C induced irreversible inhibition of CO(2) assimilation (A), photoinhibition at PSI, and inhibition of enzyme activities of Calvin cycle and ascorbate (AsA)-glutathione (GSH) cycle, followed by accumulation of H(2) O(2) and malondialdehyde (MDA). However, chill-induced photoinhibition at PSII was full recovered at LL but not at HL. Meanwhile, recovery at HL increased electron flux to O(2) -dependent alternative pathway [Ja(O(2) -dependent)]. Foliar application of 24-epibrassinolide (EBR) accelerated recovery from photoinhibition of PSII but not of PSI. EBR also significantly increased CO(2) assimilation, activity of Calvin cycle enzymes and electron flux to carbon reduction [Je(PCR)], with a concomitant decrease in Ja(O(2) -dependent), meanwhile EBR increased the activity of enzymes in AsA-GSH cycle and cellular redox states. However, the positive effect of EBR on plant recovery was observed only at HL but not LL. These results indicate that BR accelerates the recovery of photosynthetic apparatus at HL by activation of enzymes in Calvin cycle and increasing the antioxidant capacity, which in turn mitigate the photooxidative stress and the inhibition of plant growth during the recovery.
Authors:
Yu-Ping Jiang; Li-Feng Huang; Fei Cheng; Yan-Hong Zhou; Xiao-Jian Xia; Wei-Hua Mao; Kai Shi; Jing-Quan Yu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-21
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © Physiologia Plantarum 2012.
Affiliation:
Department of Horticulture, Zijingang Campus, Zhejiang University, Yuhangtang Road 866, Hangzhou, P.R. China, 310058.
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