Growth, photosynthesis and antioxidant responses of endophyte infected and non-infected rice under lead stress conditions
Growth, photosynthesis and antioxidant responses of endophyte infected and non-infected rice under lead stress conditions
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铅胁迫条件下内生菌感染和未感染水稻的生长、光合作用和抗氧化反应
DOI：
10.1016/j.jhazmat.2012.01.052
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发表时间：
2012-04-30
影响因子：
13.6
通讯作者：
Zhang, Lihong
中科院分区：
文献类型：
--
作者：
Li, Xuemei;Bu, Ning;Zhang, Lihong
对一株内生真菌在水稻（Oryza sativa L.）暴露于四个水平的铅（Pb）胁迫（0，50，100和200 μ M），以评估对植物生长，光合作用和抗氧化酶活性的影响。在铅胁迫条件下，内生菌感染的幼苗有更大的芽长，但较低的根长相比，非感染的控制，内生菌感染的幼苗有更大的干重在50和100亩M铅治疗。在铅胁迫条件下，叶绿素和类胡萝卜素水平显着较高的内生菌感染的幼苗。净光合速率、蒸腾速率和水分利用效率在50和100 μ M铅处理下均显著高于内生菌感染的幼苗。此外，Pb胁迫下，感病幼苗的叶绿素荧光参数Fv/Fm和Fv/Fo均高于未感病幼苗。铅胁迫诱导丙二醛的积累，它是存在于较高浓度的铅（100和200亩M）下，在未感染的幼苗。抗氧化活性较高或不变，在受感染的幼苗由于响应不同的铅浓度。这些结果表明，内生真菌改善水稻生长在中等水平的铅通过提高光合作用和抗氧化活性相对于非感染水稻。(C)2012爱思唯尔有限公司版权所有。
An endophytic fungus was tested in rice (Oryza sativa L.) exposed to four levels of lead (Pb) stress (0, 50, 100 and 200 mu M) to assess effects on plant growth, photosynthesis and antioxidant enzyme activity. Under Pb stress conditions, endophyte-infected seedlings had greater shoot length but lower root length compared to non-infected controls, and endophyte-infected seedlings had greater dry weight in the 50 and 100 mu M Pb treatments. Under Pb stress conditions, chlorophyll and carotenoid levels were significantly higher in the endophyte-infected seedlings. Net photosynthetic rate, transpiration rate and water use efficiency were significantly higher in endophyte-infected seedlings in the 50 and 100 mu M Pb treatments. In addition, chlorophyll fluorescence parameters Fv/Fm and Fv/Fo were higher in the infected seedlings compared to the non-infected seedlings under Pb stress. Malondialdehyde accumulation was induced by Pb stress, and it was present in higher concentration in non-infected seedlings under higher concentrations of Pb (100 and 200 mu M). Antioxidant activity was either higher or unchanged in the infected seedlings due to responses to the different Pb concentrations. These results suggest that the endophytic fungus improved rice growth under moderate Pb levels by enhancing photosynthesis and antioxidant activity relative to non-infected rice. (C) 2012 Elsevier B.V. All rights reserved.