Non-Structural Protein NSm of Tomato Spotted Wilt Virus Is an Avirulence Factor Recognized by Resistance Genes of Tobacco and Tomato via Different Elicitor Active Sites.

Non-Structural Protein NSm of Tomato Spotted Wilt Virus Is an Avirulence Factor Recognized by Resistance Genes of Tobacco and Tomato via Different Elicitor Active Sites.
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番茄斑萎病毒非结构蛋白NSm是烟草和番茄的抗性基因通过不同的激发子活性位点识别的无毒因子。

DOI:
10.3390/v10110660
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发表时间:
2018-11-21
期刊:
Viruses
影响因子:
--
通讯作者:
Tao X
Tao X
中科院分区:
其他
文献类型:
--
作者:
Huang C;Liu Y;Yu H;Yuan C;Zeng J;Zhao L;Tong Z;Tao X

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番茄斑萎病毒(Tomato spotted wilt virus,TSWV)是危害性最大的植物病毒病原之一。最近,在烟草阿拉塔中发现了一个对TSWV具有完全抗性的显性基因(RTSW),并将其导入栽培烟草(N. tabacum)。然而,TSWV是否携带针对RTSW的无毒力(Avr)因子仍不清楚。在本研究中,我们确定了非结构蛋白(NSm),TSWV的运动蛋白,这是RTSW特异性Avr因子,通过使用两种不同的瞬时表达系统。使用氨基酸(aa)取代突变体,我们证明了诱导RTSW介导的过敏反应(HR)的NSm的能力是独立的运动功能。此外,关键的取代(C118 Y和T120 N),一个21-aa的病毒效应表位,和不同的截短版本的NSm,这是负责识别番茄的Sw-5 b抗性基因,测试了它们的能力,触发HR TSWV在烟草中。总之,我们的研究结果表明,RTSW介导的抗性是由NSm以相同的方式触发的Sw-5 b,但是,通过不同的激发子活性位点。最后,建立了一个基于Avr基因的诊断方法,并用于确定烟草中抗性基因的存在和有效性。
Tomato spotted wilt virus (TSWV) is one of the most destructive viral pathogens of plants. Recently, a single dominant gene conferring complete resistance to TSWV (RTSW) was identified in Nicotina alata and introgressed into cultivated tobacco (N. tabacum). However, whether the TSWV carries an avirulence (Avr) factor directed against RTSW remains obscure. In the present study, we identified the non-structural protein (NSm), the movement protein of TSWV, which is an RTSW-specific Avr factor, by using two different transient expression systems. Using amino acid (aa) substitution mutants, we demonstrated the ability to induce RTSW-mediated hypersensitive response (HR) of NSm is independent of its movement function. Moreover, key substitutions (C118Y and T120N), a 21-aa viral effector epitope, and different truncated versions of NSm, which are responsible for the recognition of the Sw-5b resistance gene of tomato, were tested for their ability to trigger HR to TSWV in tobacco. Together, our results demonstrated that RTSW-mediated resistance is triggered by NSm in the same way as by Sw-5b, however, via different elicitor active sites. Finally, an Avr gene-based diagnostic approach was established and used to determine the presence and effectiveness of resistance genes in tobacco.
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