Toxic effects of cadmium on tall fescue and different responses of the photosynthetic activities in the photosystem electron donor and acceptor sides.
Toxic effects of cadmium on tall fescue and different responses of the photosynthetic activities in the photosystem electron donor and acceptor sides.
复制标题
镉对高羊茅的毒害作用及光系统电子供体和受体侧光合活性的不同反应
DOI：
10.1038/s41598-017-14718-w
复制
发表时间：
2017-10-30
影响因子：
4.6
通讯作者：
Sun J
中科院分区：
文献类型：
--
作者：
Huang M;Zhu H;Zhang J;Tang D;Han X;Chen L;Du D;Yao J;Chen K;Sun J
高羊茅（Festuca arundinacea Schreb）是一种广泛应用于有机污染物根际修复的草坪草，在重金属植物修复中具有重要的应用前景。采用无土栽培方法，研究了不同浓度的镉离子（Cd 2+）对高羊茅的毒害效应及其对Cd 2+的响应。高羊茅对Cd ~（2+）的耐受性与印度芥菜相当。此外，高浓度Cd 2+处理会导致高羊茅根系叶绿素含量下降、活性氧自由基（ROS）产生、脂质过氧化、细胞膜损伤、坏死和凋亡，以及Cd 2+对高羊茅生理特性的毒性也已得到充分讨论。在光系统II电子供体侧，高浓度Cd ~（2+）处理抑制了电子从放氧复合体（OEC）向D1蛋白Yz残基的传递，这可能是由于Cd ~（2+）诱导ROS的产生和OEC核心Ca ~（2+）的置换所致。在电子受体方面，高浓度Cd 2+处理提高了醌B向光系统I受体的电子传递效率，这可能是植物对Cd 2+毒害的一种重要反应，其机制有待进一步研究。
Tall fescue (Festuca arundinacea Schreb) is a turf grass species which is widely used for rhizoremediation of organic contaminants and shows notable prospects in heavy metal phytoremediation. In this study, different concentrations of cadmium ion (Cd2+) were applied to study toxic effects of Cd2+and responses of tall fescue by soilless culture. Tall fescue showed comparable high tolerance to Cd2+as Indian mustard (Brassica junceaL.). Additionally, the treatment with high concentration of Cd2+leaded to decreased chlorophyll contents, production of reactive oxygen species (ROS) and lipid peroxidation, as well as damage of cell membrane, necrosis and apoptosis in tall fescue roots, and toxicity of Cd2+on physiologic properties of tall fescue has been well discussed. Moreover, in photosystem II electron donor side, electron transport from oxygen evolution complex (OEC) to Yz residue of D1 protein was inhibited under high Cd2+treatments, which may be due to the Cd2+induced ROS production and the replacement of Ca2+in the core of OEC. In electron acceptor side, electron transport efficiency from quinone B to photosystem I acceptors increased under high Cd2+treatments, which may be an important response for plants against Cd2+toxicity and its mechanism needs our further study.