Responses of Wheat Seedlings to Exogenous Selenium Supply Under Cold Stress
Responses of Wheat Seedlings to Exogenous Selenium Supply Under Cold Stress
复制标题
DOI：
10.1007/s12011-009-8542-3
复制
发表时间：
2010-09-01
影响因子：
3.9
通讯作者：
Zhang, Zhuona
中科院分区：
文献类型：
--
作者：
Chu, Jianzhou;Yao, Xiaoqin;Zhang, Zhuona
本文报道了硒对低温胁迫下小麦幼苗生长和生理特性的剂量效应。幼苗对硒的反应因硒浓度的不同而不同。0.5和1.0mgSe kg(-1)处理显著提高了幼苗的生物量和叶绿素含量。而2.0和3.0mgSe·kg~(-1)处理仅能显著提高幼苗的叶绿素含量，而不能促进幼苗生物量的积累。不同Se处理均能提高抗氧化剂(花青素、类黄酮类和酚类化合物)含量和抗氧化酶(过氧化氢酶、过氧化氢酶)活性，而1.0 mg Se kg(-1)处理显著降低了小麦幼苗丙二醛含量和超氧阴离子自由基产生速率。本研究结果表明，施Se能提高幼苗的抗氧化能力，适宜的Se供应能减少自由基的产生，减少膜脂过氧化，促进生物量的积累。
Dose-dependent effects of selenium on growth and physiological trait of wheat seedlings (Triticum aestivum L. cv Han NO.7086) exposed to cold stress are reported. Responses of seedlings were different depending on the Se concentration. The treatments with 0.5 and 1.0 mg Se kg(-1) significantly increased biomass and chlorophyll content of seedlings. However, the treatments at 2.0 and 3.0 mg Se kg(-1) only induced an evident increase in chlorophyll content and did not promote biomass accumulation of seedlings. Antioxidant compounds content (anthocyanins, flavonoids, and phenolic compounds) and antioxidant enzymes' activities (peroxidase and catalase) increased by different Se treatments, while only the treatment with 1.0 mg Se kg(-1) induced a significant reduce in malondialdehyde content and the rate of superoxide radical production of wheat seedlings. The results of this study demonstrated that Se supply could increase antioxidant capacity of seedlings, and optimal Se supply reduced production of free radicals, membrane lipid peroxidation, and promoted biomass accumulation.