NDLI: Poly(γ-glutamic acid) enhanced tolerance to salt stress by promoting proline accumulation in Brassica napus L.

Content Provider	Springer Nature Link
Author	Lei, Peng Xu, Zongqi Liang, Jinfeng Luo, Xiaohui Zhang, Yunxia Feng, Xiaohai Xu, Hong
Copyright Year	2015
Abstract	Poly(γ-glutamic acid) (γ-PGA) is a new plant growth regulator with extensive application prospects. The effects of γ-PGA on rape seedlings under salt stress and the mechanism of action were investigated via hydroponic experiments. A salinity model was simulated by exposing the roots of rape seedlings to 100 mM NaCl solution for 48, 96 and 144 h. We determined that the growth of rape seedlings treated with NaCl was significantly inhibited. However, after the application of γ-PGA under NaCl stress, the dry weights of the entire plant, the shoot and the root were increased by 37.4, 38.8 and 34.1 %, respectively, at 144 h compared with those of the NaCl group. Moreover, the K+/Na+ ratio, proline content and antioxidant enzyme activity were all evidently enhanced, and the malondialdehyde content was significantly reduced in samples treated with γ-PGA. Proline metabolism regulation genes, including pyrroline-5-carboxylate synthetase genes (BnP5CS1 and BnP5CS2) and proline dehydrogenase gene (BnPDH), were also upregulated and downregulated by γ-PGA, respectively. Results showed that γ-PGA improved resistance to salt stress in rape seedlings by activating the proline synthesis pathway and promoting proline accumulation.
Starting Page	233
Ending Page	241
Page Count	9
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	78
Issue Number	2
e-ISSN	15735087
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-06-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	γ-PGA Salt stress K+/Na+ ratio Antioxidase Proline accumulation Proline metabolism regulation genes Plant Sciences Plant Anatomy/Development Plant Physiology Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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