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首页> 外文期刊>African Journal of Biotechnology >Alleviating effect of exogenous nitric oxide in cucumber seedling against chilling stress
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Alleviating effect of exogenous nitric oxide in cucumber seedling against chilling stress

机译：外源一氧化氮对黄瓜幼苗抗冷胁迫的缓解效应。

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摘要

Nitric oxide (NO) is a bioactive and a multifunctional gaseous molecule signal playing a central role and mediating variety of physiological processes in plants. In this study, the protective effect against chilling stress of exogenously applied sodium nitroprusside (SNP, a NO donor) in?Cucumis sativus?L. cv ZND407 and?cv ZND461 was investigated. The SNP was sprayed over cucumber seedlings using different doses at 4°C. The results indicated that malondehyde (MDA) content was decreased however, soluble sugar and chlorophyll content increased upon treatment with 1.0 mmoll-1?SNP. Further investigations showed that treatment with NO donor stimulated the activities of various enzymes such as, superoxide dismutase (SOD, EC1.15.1.1), glutathione reducatse (GR, EC1.6.4.2), peroxidase (POD, EC.1.11.1.7) and catalase (CAT, EC.1.15.11). However, the soluble protein content did not change significantly under the NO treatment. The study indicated that exogenous NO at 1.0 mmoll-1?SNP enhanced chilling stress tolerance. In comparison with?cvZND?461,?cvZND407 had higher tolerance ability to chilling stress.
机译：一氧化氮（NO）是一种生物活性和多功能气体分子信号，在植物中起着重要作用并介导多种生理过程。在这项研究中，外源施用硝普钠（SNP，NO供体）对黄瓜（Cucumis sativus）L的低温胁迫具有保护作用。对cv ZND407和cv ZND461进行了研究。在4℃下以不同剂量将SNP喷在黄瓜幼苗上。结果表明，用1.0 mmoll-1？SNP处理后，丙二醛（MDA）含量降低，可溶性糖和叶绿素含量增加。进一步的研究表明，用NO供体处理刺激了各种酶的活性，例如超氧化物歧化酶（SOD，EC1.15.1.1），谷胱甘肽还原酶（GR，EC1.6.4.2），过氧化物酶（POD，EC.1.11.1.7）。 ）和过氧化氢酶（CAT，EC.1.15.11）。然而，在NO处理下，可溶性蛋白质含量没有显着变化。研究表明，外源NO浓度为1.0 mmoll-1？SNP可以增强其耐寒性。与？cvZND？461相比，？cvZND407具有更高的耐寒性。

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