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Mitochondrial alterations during Al-induced PCD in peanut root tips

文献类型： 外文期刊

作者： Zhan, Jie 1 ; Li, Wen 1 ; He, Hu-yi 1 ; Li, Chuang-zhen 1 ; He, Long-fei 1 ;

作者机构： 1.Guangxi Univ, Coll Agron, Nanning 530004, Peoples R China

2.Guangxi Acad Agr Sci, Cash Res Inst, Nanning 530007, Peoples R China

关键词： Al-induced PCD;Peanut;Root tips;Mitochondria

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： Previous study found there was a negative relationship between Al-induced PCD and Al-resistance in peanut. The present research was undertaken to verify whether mitochondria play a significant role in PCD induced by Al in peanut. The roots of Al-tolerant plants were found to exhibit more intensive root growth, while accumulating less Al~(3+) than Al-sensitive plants under Al treatment. The different enhancement of ROS production was observed in the mitochondria isolated from two peanut cultivars. The concentration of mitochondrial MDA in root tips increased after Al treatment, which was higher in Zhonghua 2 than in 99-1507. With the increase of Al concentration, mitochondrial Ca2t concentration decreased, and Ca2t concentration of Zhonghua 2 decreased faster than that of 99-1507. The opening of mitochondrial permeability transition pore was more extensively in mitochondria isolated from Zhonghua 2 than from 99-1507. The collapse of inner mitochondrial membrane potential (DJm) was also observed with a release of Cytochrome c (Cyt c) from mitochondria, it was more obvious in Zhonghua 2 than in 99-1507 with Al concentration increasing. The results showed that mitochondrial membrane structure and function were damaged seriously in Al-induced PCD, the increase of mitochondrial antioxidant system activity decreased cellular damages under Al stress. To sum up, compared with Alsensitive peanut cultivar, Al-tolerant peanut cultivar has less Al~(3+) absorption, mitochondrial ROS and membrane lipid peroxidation level, higher control of MPT opening, ΔΨm maintaining, Cty c release from mitochondria and mitochondrial respiratory functions so that it is not easy to produce PCD under Al stress.

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