Calcium involved in the poly(gamma-glutamic acid)-mediated promotion of Chinese cabbage nitrogen metabolism

文献类型： 外文期刊

第一作者： Xu, Zongqi

作者： Xu, Zongqi;Lei, Peng;Feng, Xiaohai;Liang, Jinfeng;Chi, Bo;Xu, Hong;Xu, Zongqi;Lei, Peng;Feng, Xiaohai;Liang, Jinfeng;Chi, Bo;Xu, Hong;Xu, Xianju;Feng, Xiaohai;Liang, Jinfeng;Chi, Bo;Xu, Hong

作者机构：

关键词： Poly(gamma-glutamic acid);Nitrogen metabolism;Chinese cabbage;Subcellular compartments;Calcium

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

ISSN： 0981-9428

年卷期： 2014 年 80 卷

页码：

收录情况： SCI

摘要： Plant growth can reportedly be promoted by poly(gamma-glutamic acid) (gamma-PGA). However, the underlying mechanism is unknown. To reveal the mechanism of gamma-PGA, we designed an experiment that investigated the effect of gamma-PGA on the nitrogen metabolism of Chinese cabbage hydroponic cultured at different calcium (Ca) levels and varied exogenous Ca2+ inhibitors. The results showed that nitrate reductase (NR), glutamine synthetase (GS), glutamate synthase, and glutamate dehydrogenase activities in leaves and roots were obviously enhanced by gamma-PGA at the normal Ca2+ level (4.0 mM). Meanwhile, gamma-PGA increased the content of total nitrogen, soluble protein, and soluble amino acids in leaves. However, the promotional effect of gamma-PGA on fresh weight weakened when Ca2+ was inadequate. Moreover, gamma-PGA not only induced the influx of extracellular Ca2+ and Ca2+ in organelles into cytoplasm, but also increased the Ca2+-ATPase level to modify Ca2+ homeostasis in plant cells. In addition, exogenous Ca2+ inhibitors significantly suppressed the gamma-PGA-mediated promotion of cytoplasmic free Ca2+ level, calmodulin (CaM) content, GS and glutamate dehydrogenase activities. In summary, gamma-PGA accelerated the nitrogen metabolism of plants through the Ca2+/CaM signaling pathway, thereby improving the growth of the plant. (C) 2014 Elsevier Masson SAS. All rights reserved.

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