[Effects of exogenous silicon on active oxygen scavenging systems in chloroplasts of cucumber (Cucumis sativus L.) seedlings under salt stress].
With K(2)SiO(4) (1.0 mmol/L) treatment, the effects of Si on the distribution of Na(+), K(+) to chloroplasts and antioxidant system of cucumber leaves under 50 mmol/L NaCl stress were studied. The results showed that there was a selective transport of K(+) into the chloroplasts so that Na(+) content of chloroplasts was lower under Si treatment (Table 1); H(2)O(2) and MDA contents in chloroplasts were significantly decreased (Fig.1), and the activities of SOD, APX, GR and DHAR were increased simultaneity (Fig.2), and AsA, GSH contents were also increased in chloroplasts of salt-stressed cucumber by additional Si treatment (Fig.3). It may be concluded that Si could decrease absorption of Na(+) and increase ability of active oxygen scavenging in chloroplasts, therefore the injury of chloroplast membrane under salinity stress in cucumber was alleviated.
Key Laboratory of Horticultural Plant Development and Biotechnology, Ministry of Agriculture, Department of Horticulture, Zhejiang University, Hangzhou 310029, China.
Qiong-Qiu
QQ
Qian
Wen-San
WS
Zai
Zhu-Jun
ZJ
Zhu
Jing-Quan
JQ
Yu
D029681:Arabidopsis Proteins / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D002736:Chloroplasts / Q000187:drug effects* / Q000378:metabolism; D018553:Cucumis sativus / Q000187:drug effects* / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D010544:Peroxidases / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects* / Q000378:metabolism; D012825:Silicon / Q000633:toxicity*; D012965:Sodium Chloride / Q000494:pharmacology; D013482:Superoxide Dismutase / Q000378:metabolism
D029681:Arabidopsis Proteins; D017382:Reactive Oxygen Species; D012965:Sodium Chloride; D006861:Hydrogen Peroxide; D010544:Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; C519170:DHAR1 protein, Arabidopsis; D005982:Glutathione Transferase; D012825:Silicon