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| 外源NO对高羊茅镉伤害缓解效应研究 | |
| 引用本文： | 张开会,高素萍,闻金燕,雷霆,林啸.外源NO对高羊茅镉伤害缓解效应研究[J].草地学报,2015,23(2):338-345. |
| 作者姓名： | 张开会 高素萍 闻金燕 雷霆 林啸 |
| 作者单位： | 1. 四川农业大学风景园林学院, 四川 成都 611130; 2. 四川农业大学园林研究所, 四川 成都 611130 |
| 摘 要： | 为了探讨外源一氧化氮(NO)对镉(Cd)胁迫下高羊茅(Festuca arundinacea)生理响应的调节机制,采用水培方法,研究了不同浓度的NO供体硝普钠(SNP)对100 μ mol·L-1CdCl2胁迫下高羊茅幼苗生长、光合特性及矿质元素吸收的影响.结果表明:在Cd胁迫下,外施SNP能显著增加高羊茅叶片中NO含量,同时增加植株干重,提高根生长率和根系活力;增加叶片中叶绿素和类胡萝卜素的含量,提高净光合速率(Pn)、增强PSII反应中心最大光能转换效率(Fv/Fm) 等指标,显著增强了高羊茅地上部分与根对Ca,Mg,Zn和Fe的吸收,抑制了Cd向地上部分的转运.综合各项指标来看,100 μmol·L-1SNP效果最好,能够显著改善高羊茅叶片的光合活性,维持植株体内矿质元素平衡,从而缓解Cd胁迫对高羊茅光合作用的抑制,促进其生长并提高其耐受性. |
| 关 键 词： | 一氧化氮 高羊茅 镉伤害 植物修复 |
| 收稿时间： | 2014-04-02 |
Ameliorating Effects of Exogenous Nitric Oxide on Festuca arundinacea under Cadmium Stress |
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| ZHANG Kai-hui,GAO Su-ping,WEN Jin-yan,LEI Ting,LIN Xiao.Ameliorating Effects of Exogenous Nitric Oxide on Festuca arundinacea under Cadmium Stress[J].Acta Agrestia Sinica,2015,23(2):338-345. | |
| Authors: | ZHANG Kai-hui GAO Su-ping WEN Jin-yan LEI Ting LIN Xiao |
| Institution: | 1. Landscape Architecture College of Sichuan Agricultural University, Chengdu, Sichuan Province 611130, China; 2. Institute of Landscape Architecture of Sichuan Agricultural University, Chengdu, Sichuan Province 611130, China |
| Abstract: | In order to discuss the regulatory mechanism of nitric oxide (NO) on Festuca arundinacea physiological response under Cd stress, a hydroponic experiment was conducted to investigate the effects of different concentrations of sodium nitroprusside (SNP,NO donor) on the physiological performance of F.arundinacea under 100 μmol·L-1 CdCl2 stress. These physiological performances included the growth, photosynthetic characteristics and mineral element contents of F. arundinacea. The results showed that exogenous SNP not only significantly increased the NO contents of leaves, plant dry weight, root growth rate and root activity of F. arundinacea under Cd stress; but also increased leaf chlorophylls and carotenoids contents, net photosynthetic rate (Pn), PSⅡ maximum photochemical efficiency (Fv/Fm). In addition, SNP significantly enhanced the calcium (Ca), magnesium (Mg), iron(Fe), zinc (Zn) contents of shoots and roots, inhibited the transportation of Cd from root to shoot. These results showed that adding exogenous nitric oxide could increase the resistance of F. arundinacea under Cd stress. Comprehensive view of the indicators indicated that 100 μmol ·L-1 SNP had the best effect on improving photosynthetic activity and maintaining the mineral nutrition balance, then the inhibition of photosynthesis caused by Cd stress was alleviated and the tolerance of F. arundinacea increased. |
| Keywords: | Nitric oxide F arundinacea Cadmium stress Phytoremediation |
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