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Robust RNAi-mediated resistance to infection of seven potyvirids in soybean expressing an intron hairpin NIb RNA

文献类型： 外文期刊

作者： Yang, Xiangdong 1 ; Niu, Lu 1 ; Zhang, Wei 1 ; He, Hongli 1 ; Yang, Jing 1 ; Xing, Guojie 1 ; Guo, Dongquan 1 ; Du, Qian; 1 ;

作者机构： 1.Jilin Acad Agr Sci, Jilin Prov Key Lab Agr Biotechnol, Changchun 130033, Jilin, Peoples R China

2.Jilin Acad Agr Sci, Jilin Prov Key Lab Agr Biotechnol,

关键词： Soybean;Potyvirids;SMV NIb;RNAi-mediated resistance;Viral resistance spectrum

期刊名称：TRANSGENIC RESEARCH （ 影响因子：2.788； 五年影响因子：2.377 ）

ISSN：

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收录情况： SCI

摘要： Viral pathogens, such as soybean mosaic virus (SMV), are a major constraint in soybean production and often cause significant yield loss and quality deterioration. Engineering resistance by RNAi-mediated gene silencing is a powerful strategy for controlling viral diseases. In this study, a 248-bp inverted repeat of the replicase (nuclear inclusion b, NIb) gene was isolated from the SMV SC3 strain, driven by the leaf-specific rbcS2 promoter from Phaseolus vulgaris, and introduced into soybean. The transgenic lines had significantly lower average disease indices (ranging from 2.14 to 12.35) than did the non-transformed (NT) control plants in three consecutive generations, exhibiting a stable and significantly enhanced resistance to the SMV SC3 strain under field conditions. Furthermore, seed mottling did not occur in transgenic seeds, whereas the NT plants produced similar to 90% mottled seeds. Virus resistance spectrum screening showed that the greenhouse-grown transgenic lines exhibited robust resistance to five SMV strains (SC3, SC7, SC15, SC18, and a recombinant SMV), bean common mosaic virus, and watermelon mosaic virus. Nevertheless, no significantly enhanced resistance to bean pod mottle virus (BPMV, Comovirus) was observed in the transgenic lines relative to their NT counterparts. Consistent with the results of resistance evaluation, the accumulation of each potyvirid (but not of BPMV) was significantly inhibited in the transgenic plants relative to the NT controls as confirmed by quantitative real-time (qRT-PCR) and double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA). These results demonstrate that robust RNAi-mediated resistance to multiple potyvirids in soybean was conferred by expressing an intron hairpin SMV NIb RNA.

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