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Plant function and evolutionary biology
RESEARCH ARTICLE

Overexpression of a soybean 4-coumaric acid: coenzyme A ligase (GmPI4L) enhances resistance to Phytophthora sojae in soybean

Xi Chen A * , Xin Fang A * , Youyi Zhang A * , Xin Wang A B * , Chuanzhong Zhang A * , Xiaofei Yan A , Yuanling Zhao A C , Junjiang Wu D , Pengfei Xu A E and Shuzhen Zhang https://orcid.org/0000-0002-3311-0092 A E
+ Author Affiliations
- Author Affiliations

A Soybean Research Institute, Key Laboratory of Soybean Biology of Chinese Education Ministry, Northeast Agricultural University, Harbin, Heilongjiang, China.

B Heilongjiang Academy of Land Reclamation Sciences, Harbin, Heilongjiang, China.

C Biotechnology Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, China.

D Soybean Research Institute of Heilongjiang Academy of Agricultural Sciences, Key Laboratory of Soybean Cultivation of Ministry of Agriculture PR China, Harbin Heilongjiang, China.

E Corresponding authors. Email: xupengfei@neau.edu.cn; zhangshuzhen@neau.edu.cn

Functional Plant Biology 46(4) 304-313 https://doi.org/10.1071/FP18111
Submitted: 27 April 2018  Accepted: 18 October 2018   Published: 7 November 2018

Abstract

Phytophthora root and stem rot of soybean (Glycine max (L.) Merr.) caused by Phytophthora sojae is a destructive disease worldwide. The enzyme 4-coumarate: CoA ligase (4CL) has been extensively studied with regard to plant responses to pathogens. However, the molecular mechanism of the response of soybean 4CL to P. sojae remains unclear. In a previous study, a highly upregulated 4CL homologue was characterised through suppressive subtractive hybridisation library and cDNA microarrays, in the resistant soybean cultivar ‘Suinong 10’ after infection with P. sojae race 1. Here, we isolated the full-length EST, and designated as GmPI4L (P. sojae-inducible 4CL gene) in this study, which is a novel member of the soybean 4CL gene family. GmPI4L has 34–43% over all amino acid sequence identity with other plant 4CLs. Overexpression of GmPI4L enhances resistance to P. sojae in transgenic soybean plants. The GmPI4L is located in the cell membrane when transiently expressed in Arabidopsis protoplasts. Further analyses showed that the contents of daidzein, genistein, and the relative content of glyceollins are significantly increased in overexpression GmPI4L soybeans. Taken together, these results suggested that GmPI4L plays an important role in response to P. sojae infection, possibly by enhancing the content of glyceollins, daidzein, and genistein in soybean.

Additional keywords: GmPI4L, pathogenic change, Phytophthora sojae, soybean.


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