Cadmium-induced oxidative damage in mustard [Brassica juncea (L.) Czern. & Coss.] plants can be alleviated by salicylic acid
Cadmium-induced oxidative damage in mustard [Brassica juncea (L.) Czern. & Coss.] plants can be alleviated by salicylic acid
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DOI：
10.1016/j.sajb.2010.05.003
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发表时间：
2011-01-01
影响因子：
3.1
通讯作者：
Ashraf, M.
中科院分区：
文献类型：
--
作者：
Ahmad, P.;Nabi, G.;Ashraf, M.
研究了水杨酸（SA）对芥菜（Brassica juncea（L.）czern. & Coss.]植物暴露于镉（Cd）胁迫。随着Cd浓度的增加，植株生长、地上部生物量、相对含水量（RWC）和光合速率（A）下降。SA缓解了Cd对生长、RWC和A的不利影响，但SA处理进一步增强了Cd对气孔导度（g（s））和蒸腾速率（E）的抑制作用。镉诱导的氧化应激增加脯氨酸，脂质过氧化和电解质渗漏，但在暴露于SA，这些参数表现出显着下降。较低浓度的Cd导致Cd向植物体内的转运增强。镉抑制了吸收的宏观和微观养分，但外源性应用SA恢复植物积累必需元素的能力。SA可缓解Cd对芥菜生长的抑制作用。镉诱导的一些关键的抗氧化酶，超氧化物歧化酶（SOD），抗坏血酸过氧化物酶（APX），过氧化氢酶（CAT），谷胱甘肽还原酶（GR）的活性增加减少了外源性应用SA。这表明水杨酸可能是镉胁迫下芥菜体内潜在的抗氧化剂之一。(C)2010年萨博。Elsevier B.V.出版，保留所有权利。
The present study was carried out to examine the effects of salicylic acid (SA) on growth, activities of antioxidant enzymes and some physiobiochemical attributes in mustard [Brassica juncea (L.) Czern. & Coss.] plants exposed to cadmium (Cd) stress. Increasing concentrations of Cd led to decreased growth, shoot biomass, relative water content (RWC) and rate of photosynthesis (A). SA allayed the adverse effects of Cd on growth, RWC, and A, but the inhibitory effect of Cd on stomatal conductance (g(s)) and transpiration rate (E) was further promoted due to SA treatment. Cadmium-induced oxidative stress increased proline, lipid peroxidation and electrolyte leakage, but on exposure to SA, these parameters showed a marked decrease. Lower concentrations of Cd caused enhanced Cd transport into the plant. Cadmium suppressed the uptake of macro- and micro-nutrients, but exogenous application of SA restored the capability of plants to accumulate essential elements. SA mitigated the Cd-induced inhibition in the growth of mustard plants. Cadmium-induced increase in the activities of some key antioxidant enzymes, superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), and glutathione reductase (GR) was reduced by the exogenous application of SA. This reflects that SA might have acted as one of the potential antioxidants in mustard plants under Cd stress. (C) 2010 SAAB. Published by Elsevier B.V. All rights reserved.