The dynamic changing of Ca2+ cellular localization in maize leaflets under drought stress

文献类型: 外文期刊

第一作者: Shao Hong-bo

作者: Shao Hong-bo;Liu Zi-hui;Zhang Hong-mei;Guo Xiu-lin;Shao Hong-bo;Shao Hong-bo;Shao Hong-bo;Ma Yuan-yuan;Song Wei-yi;Ni Fu-tai

作者机构:

关键词: Osmotic stress;Maize;Ca2+ localization;Cell super-microstructure;Biomembrane;Signal

期刊名称:COMPTES RENDUS BIOLOGIES ( 影响因子:1.583; 五年影响因子:2.123 )

ISSN: 1631-0691

年卷期: 2009 年 332 卷 4 期

页码:

收录情况: SCI

摘要: Maize cultivar zhengdan958 was selected as materials. The sub-cellular distribution of soluble calcium at different phases was shown by the potassium-pyroantinonate-precipitation method and transmission electron microscopy. The results showed that the deposits of calcium antimonate as the indicator for Ca2+ localization were mainly concentrated within the vacuoles and intercellular spaces without PEG treatment. Firstly, when the leaf was treated with PEG, the Ca2+ level increased remarkably in the cytoplasm, but considerably decreased in vacuoles and intercellular gaps. Meanwhile, the level of Ca2+ also increased in chloroplast and nucleus. When the treatment continued, the level of Ca2+ in chloroplasts and nucleus continued to increase and some cells and chloroplasts finally disintegrated, showing that there is a relationship between the distribution of Ca2+ and the super-microstructure of cells. Ca2+ plays a role in the plant drought resistance. The changes of cytosolic Ca2+ localization in cells treated by ABA, EGTA, Verapamit and TFP were investigated too. The increase of cytosolic calcium induced by ABA was mainly caused by calcium influx. Calmodulin participated in ABA signal transduction, which was indicated by the variation of cytosolic Ca2+/CaM concentration change induced by ABA. The above results provided a direct evidence for calcium ion as an important signal at the experimental cellular level. To cite this article: Y. Y Ma et al., C R. Biologies 332 (2009). (C) 2008 Academic des sciences. Published by Elsevier Masson SAS. All rights reserved.

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