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Plant Physiol Biochem. 2014 Jan;74:118-24. doi: 10.1016/j.plaphy.2013.11.008. Epub 2013 Nov 15.

Rubisco decrease is involved in chloroplast protrusion and Rubisco-containing body formation in soybean (Glycine max.) under salt stress.

Author information

1
State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China; Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom.
2
State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
3
Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China.
4
State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China. Electronic address: dajiang@zju.edu.cn.

Abstract

Salt stress often induces declination of net photosynthetic rate (Pn), partially resulted from Rubisco degradation. The chloroplast protrusions (CPs) is one of the pathways of Rubisco exclusion from chloroplasts. To explore the relationship between the Rubisco contents and CPs under salt stress, Pn, maximum photochemical efficiency of PSII (F(v)/F(m)), carboxylation efficiency (CE) and concentration of Rubisco, number of CPs and Rubisco-containing Body (RCBs) were investigated with two differently salt-responding varieties in this experiment. We observed that 150 mM salt treatment resulted in not only significant decrease in Pn, CE and Rubisco content, but also obvious increase in the number of CPs and RCBs in salt-sensitive variety. Under salt stress formation of CPs resulted in production of much more RCBs, which could immigrate into and combine with vacuole. It may be a kind of important mechanism for rapid degradation of Rubisco under salt stress. Our conclusion provides a new sight for how Rubisco can be fast degraded under salt stress.

KEYWORDS:

Chloroplast protrusions; Rubisco; Rubisco-containing body; Salt stress

PMID:
24291158
DOI:
10.1016/j.plaphy.2013.11.008
[Indexed for MEDLINE]
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