Authors: Yongqi Yin Runqiang Yang Qianghui Guo Zhenxin Gu
Publish Date: 2014/01/18
Volume: 238, Issue: 5, Pages: 781-788
Abstract
Effects of NaCl stress and supplemental CaCl2 on soybean growth and gammaaminobutyric acid GABA accumulation pathways in germinating soybean were investigated Germinating under NaCl stress GABA accumulation was caused not only by the activation of glutamate decarboxylase GAD diamine oxidase DAO and aminoaldehyde dehydrogenase AMADH existing in seed but also by their gene expression upregulation during germination However after CaCl2 6 mM application the harmful effect of NaCl stress 50 mM was removed GAD activity significantly increased while its gene expression levels had no significant changes with the control indicating that the increment in GAD activity was caused by the stimulation of exogenous Ca2+ Meanwhile GABA was still accumulated although DAO and AMADH activities and their gene expression levels had no significant difference compared with the control It can be concluded that CaCl2 addition decreased the contribution of polyamine degradation pathway to GABA accumulation compared with NaCl stress and the increased GABA was mainly synthesized via GABA shuntWe are grateful for the financial support from Natural Science Foundation of China 31071581 the Fundamental Research Funds for the Central Universities KYZ200917 and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions PAPD
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