Enhanced resistance to soybean cyst nematode in transgenic soybean via host-induced silencing of vital Heterodera glycines genes

文献类型： 外文期刊

第一作者： Zhang, Yuanyu

作者： Zhang, Yuanyu;Zhao, Qianqian;Zhang, Jinhua;Niu, Lu;Yang, Jing;Liu, Xiaomei;Xing, Guojie;Zhong, Xiaofang;Yang, Xiangdong

作者机构：

关键词： Soybean cyst nematode; Heterodera glycines; Host-induced silencing

期刊名称：TRANSGENIC RESEARCH （ 影响因子：3.145； 五年影响因子：2.71 ）

ISSN： 0962-8819

年卷期： 2022 年 31 卷 2 期

页码：

收录情况： SCI

摘要： Soybean cyst nematode (SCN, Heterodera glycines Ichinohe) is the most economically damaging pathogen affecting soybean production worldwide. Host-induced gene silencing provides a promising approach to confer resistance to plant parasitic nematodes. In the present study, we produced stable transgenic soybean plants individually harboring the inverted repeats of three essential H. glycines genes, Hg-rps23, Hg-snb1, and Hg-cpn1, and evaluated their resistance to SCN infection. Molecular characterization confirmed the stable integration of the hairpin double stranded (ds) RNA in host plants. Inoculation assays with SCN race 3 showed significant reduction of female index (FI, 11.84 similar to 17.47%) on the roots of T-4 transgenic plants, with 73.29 similar to 81.90% reduction for the three RNA interference (RNAi) constructs, compared to non-transformed plants (NT, 65.43%). Enhanced resistance to SCN race 3 was further confirmed in subsequent generations (T-5) of transgenic soybean. Moreover, when inoculated with SCN race 4 which was considered highly virulent to most of soybean germplasms and varieties, transgenic soybean plants also exhibited reduced FIs (9.96 similar to 23.67%) and increased resistance, relative to the NT plants (46.46%). Consistently, significant down-regulation in transcript levels of the Hg-rps23, Hg-snb1, Hg-cpn1 genes were observed in the nematodes feeding on the transgenic roots, suggesting a broad-spectrum resistance mediated by the host-mediated silencing of vital H. glycines genes. There were no significant differences in morphological traits between transgenic and NT soybean plants under conditions with negligible SCN infection. In summary, our results demonstrate the effectiveness of host-induced silencing of essential H. glycines genes to enhance broad-spectrum SCN resistance in stable transgenic soybean plants, without negative consequences on the agronomic performance.

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