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Brassinosteroid-induced CO(2) assimilation is associated with increased stability of redox-sensitive photosynthetic enzymes in the chloroplasts in cucumber plants.

Abstract：

:Brassinosteroids (BRs) play important roles in plant growth, development, photosynthesis and stress tolerance; however, the mechanism underlying BR-enhanced photosynthesis is currently unclear. Here, we provide evidence that an increase in the BR level increased the quantum yield of PSII, activities of Rubisco activase (RCA) and fructose-1,6-bisphosphatase (FBPase), and CO(2) assimilation. BRs upregulated the transcript levels of genes and activity of enzymes involved in the ascorbate-glutathione cycle in the chloroplasts, leading to an increased ratio of reduced (GSH) to oxidized (GSSG) glutathione in the chloroplasts. An increased GSH/GSSG ratio protected RCA from proteolytic digestion and increased the stability of redox-sensitive enzymes in the chloroplasts. These results strongly suggest that BRs are capable of regulating the glutathione redox state in the chloroplasts through the activation of the ascorbate-glutathione cycle. The resulting increase in the chloroplast thiol reduction state promotes CO(2) assimilation, at least in part, by enhancing the stability and activity of redox-sensitive photosynthetic enzymes through post-translational modifications.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Jiang YP,Cheng F,Zhou YH,Xia XJ,Mao WH,Shi K,Chen ZX,Yu JQ

doi

10.1016/j.bbrc.2012.08.100

subject

Has Abstract

pub_date

2012-09-28 00:00:00

pages

390-4

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(12)01666-X

journal_volume

426

pub_type

杂志文章

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