Endogenous salicylic acid is required for promoting cadmium tolerance of Arabidopsis by modulating glutathione metabolisms
文献类型: 外文期刊
第一作者: Guo, Bin
作者: Guo, Bin;Liu, Chen;Li, Hua;Ding, Nengfei;Li, Ningyu;Lin, Yicheng;Fu, Qinglin;Guo, Bin;Liu, Chen;Li, Hua;Ding, Nengfei;Li, Ningyu;Lin, Yicheng;Fu, Qinglin;Yi, Keke
作者机构:
关键词: Antioxidant enzymes;Cadmium;Element uptake;GSH;Salicylic acid
期刊名称:JOURNAL OF HAZARDOUS MATERIALS ( 影响因子:10.588; 五年影响因子:10.129 )
ISSN:
年卷期:
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收录情况: SCI
摘要: A few studies with NahG transgenic lines of Arabidopsis show that depletion of SA enhances cadmium (Cd) tolerance. However, it remains some uncertainties that the defence signaling may be a result of catechol accumulation in NahG transgenic lines but not SA deficiency. Here, we conducted a set of hydroponic assays with another SA-deficient mutant sid2 to examine the endogenous roles of SA in Cd tolerance, especially focusing on the glutathione (GSH) cycling. Our results showed that reduced SA resulted in negative effects on Cd tolerance, including decreased Fe uptake and chlorophyll concentration, aggravation of oxidative damage and growth inhibition. Cd exposure significantly increased SA concentration in wild-type leaves, but did not affect it in sid2 mutants. Depletion of SA did not disturb the Cd uptake in either roots or shoots. The reduced Cd tolerance in sid2 mutants is due to the lowered GSH status, which is associated with the decreased expression of serine acetyltransferase along with a decline in contents of non-protein thiols, phytochelatins, and the lowered transcription and activities of glutathione reductase1 (GR1) which reduced GSH regeneration. Finally, the possible mode of SA signaling through the GR/GSH pathway during Cd exposure is discussed. (C) 2016 Elsevier B.V. All rights reserved.
分类号: TB1
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