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首页> 外文期刊>Plant Molecular Biology >Cloning and characterization of the durable tomato mosaic virus resistance gene Tm-22 from Lycopersicon esculentum
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Cloning and characterization of the durable tomato mosaic virus resistance gene Tm-22 from Lycopersicon esculentum

机译:番茄番茄持久性抗番茄花叶病毒基因Tm-22 的克隆与鉴定

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摘要

In tomato, infections by tomato mosaic virus are controlled by durable Tm-22 resistance. In order to gain insight into the processes underlying disease resistance and its durability, we cloned and analysed the Tm-22 resistance gene and the susceptible allele, tm-2. The Tm-22 gene was isolated by transposon tagging using a screen in which plants with a destroyed Tm-22 gene survive. The Tm-22 locus consists of a single gene that encodes an 861 amino acid polypeptide, which belongs to the CC-NBS-LRR class of resistance proteins. The putative tm-2 allele was cloned from susceptible tomato lines via PCR with primers based on the Tm-22 sequence. Interestingly, the tm-2 gene has an open reading frame that is comparable to the Tm-22 allele. Between the tm-2 and the Tm-22 polypeptide 38 amino acid differences are present of which 26 are located in the second half of the LRR-domain. Susceptible tomato plants, which were transformed with the Tm-22 gene, displayed resistance against ToMV infection. In addition, virus specificity, displayed by the Tm-22 resistance was conserved in these transgenic lines. To explain the durability of this resistance, it is proposed that the Tm-22-encoded resistance is aimed at the Achilles' heel of the virus.
机译:在番茄中,番茄花叶病毒的感染受持久的Tm-22 抗性控制。为了深入了解疾病抗性及其持久性的过程,我们克隆并分析了Tm-22 抗性基因和易感等位基因tm-2。 Tm-22 基因是通过转座子标签分离得到的,该屏幕上的Tm-22 基因被破坏。 Tm-22 基因座由一个编码861个氨基酸的多肽的单一基因组成,该多肽属于CC-NBS-LRR类抗性蛋白。通过基于Tm-22 序列的引物PCR,从易感番茄品系中克隆出推定的tm-2等位基因。有趣的是,tm-2基因的开放阅读框与Tm-22 等位基因相当。在tm-2和Tm-22 多肽之间存在38个氨基酸差异,其中26个位于LRR结构域的后半部分。用Tm-22 基因转化的易感番茄植株对ToMV感染具有抗性。此外,在这些转基因品系中,由Tm-22 抗性表现出的病毒特异性得以保留。为了解释这种抗药性的持久性,建议将Tm-22 编码的抗药针对该病毒的致命弱点。

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