一氧化氮诱导缓解短期和长期Cd胁迫对鹰嘴豆生长、氧化代谢和Cd积累的毒性作用

A. Kumari, S. Sheokand, K. Swaraj
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引用次数: 58

摘要

本研究研究了长期和短期Cd胁迫对鹰嘴豆植株的影响,并评价了硝普钠(SNP)外源补充一氧化氮(NO)的保护作用。在播种前(长期胁迫)和发芽后30 d(短期胁迫)分别进行镉处理。硝普钠在萌发后30 d喷施于长期和短期Cd处理的植株。镉对膜有不利影响,这从增加的电解质泄漏和脂质过氧化水平可见一斑。硝普钠处理显著降低离子泄漏和脂质过氧化水平。短期Cd胁迫诱导过氧化氢酶、过氧化物酶、抗坏血酸过氧化物酶、谷胱甘肽还原酶和超氧化物歧化酶的活性高于长期Cd胁迫。一氧化氮通过进一步提高抗氧化酶的活性来显示其积极作用。镉胁迫还通过降低抗坏血酸氧化还原比(ASC/DHA)和谷胱甘肽氧化还原比(GSH/GSSG)改变了抗氧化代谢物水平。硝普钠处理提高了氧化还原率。镉对种子产量也有不利影响,与短期镉胁迫相比,长期镉胁迫对种子产量的影响更大。一氧化氮对种子产量和Cd积累有积极影响。研究表明,外源一氧化氮可保护鹰嘴豆植物免受镉毒害。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nitric oxide induced alleviation of toxic effects of short term and long term Cd stress on growth, oxidative metabolism and Cd accumulation in Chickpea
The present study investigates the effect of long and short term Cd stress in chickpea plants and evaluates the protective effect of exogenous nitric oxide (NO) supplementation using sodium nitroprusside (SNP). Cadmium treatments were given before sowing (long term stress) and thirty days after germination (short term stress). Sodium nitroprusside was given as foliar spray 30 days after germination to both long and short term Cd treated plants. Cadmium adversely affected the membranes as was evident from increased electrolyte leakage and lipid peroxidation levels. Sodium nitroprusside treatments decreased ion leakage and lipid peroxidation levels significantly. Short term Cd stress resulted in a higher induction of the catalase, peroxidase, ascorbate peroxidase, glutathione reductase and superoxide dismutase as compared to long term Cd stress. Nitric oxide showed its positive effect by further increasing the activities of antioxidant enzymes. Cadmium stress also altered the level of antioxidant metabolites by reducing the ascorbate redox ratio (ASC/DHA) and glutathione redox ratio (GSH/GSSG). Sodium nitroprusside treatments increased the redox ratios. Cadmium also adversely affected the seed yield and a greater decline was observed with long term Cd stress as compared to short term Cd stress. Nitric oxide had a positive effect on seed yield and Cd accumulation. The study concludes that an exogenous supply of NO protects chickpea plants from Cd toxicity.
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