Effects of a dark septate endophyte (DSE) on growth, cadmium content, and physiology in maize under cadmium stress
Effects of a dark septate endophyte (DSE) on growth, cadmium content, and physiology in maize under cadmium stress
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镉胁迫下深色有隔内生菌 (DSE) 对玉米生长、镉含量和生理的影响。
DOI：
10.1007/s11356-017-9459-6
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发表时间：
2017-08-01
影响因子：
5.8
通讯作者：
Zhao, Zhiwei
中科院分区：
文献类型：
--
作者：
He, Yongmei;Yang, Zhixin;Zhao, Zhiwei
深色有隔内生菌（DSE）广泛分布于生长在压力环境中的植物根部，特别是在重金属污染的土壤中。但对于重金属胁迫下 DSE 与植物之间的生理相互作用知之甚少。在本研究中，在砂培养实验中，在镉胁迫（0、5、10、20 和 40 毫克/千克）下，分析了玉米的生长、镉含量和对根部定殖 DSE（Exophiala pisciphila）的生理反应。在高 Cd（10、20 和 40 mg/kg）胁迫下，DSE 在根部定殖促进了玉米生长，在根部保留了更多的 Cd，并降低了地上部的 Cd 含量。 DSE定植改善了光合作用并引起植物激素的显着变化，但对玉米叶片的抗氧化能力没有显着影响。此外，玉米叶片中赤霉酸（GA）含量与蒸腾速率、玉米素核苷（ZR）含量和光合速率均呈显着正相关。这些结果表明，DSE促进植物生长的能力与降低Cd含量以及调节玉米叶片的植物激素平衡和光合活性有关。
Dark septate endophytes (DSE) are widely distributed in plant roots grown in stressful habitats, especially in heavy metal-polluted soils. But little is known about the physiological interactions between DSE and plants under heavy metal stress. In the present study, the growth, Cd content, and physiological response of Zea mays L. to a root-colonized DSE, Exophiala pisciphila, were analyzed under Cd stress (0, 5, 10, 20, and 40 mg/kg) in a sand culture experiment. Under high Cd (10, 20, and 40 mg/kg) stress, the DSE colonization in roots increased the maize growth, kept more Cd in roots, and decreased Cd content in shoots. The DSE colonization improved the photosynthesis and induced notable changes on phytohormones but had no significant effect on the antioxidant capability in the maize leaves. Moreover, there were significant positive correlations between the gibberellic acid (GA) content and transpiration rate, zeatin riboside (ZR) content, and photosynthetic rate in maize leaves. These results indicated that the DSE's ability to promote plant growth was related to a decrease on Cd content and the regulation on phytohormone balance and photosynthetic activities in maize leaves.