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首页> 外文期刊>Molecular Plant-Microbe Interactions >Qualitative and Quantitative Late Blight Resistance in the Potato Cultivar Sarpo Mira Is Determined by the Perception of Five Distinct RXLR Effectors
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Qualitative and Quantitative Late Blight Resistance in the Potato Cultivar Sarpo Mira Is Determined by the Perception of Five Distinct RXLR Effectors

机译：定性和定量晚疫病抗性在马铃薯品种Sarpo Mira中的确定是由五个不同的RXLR效应子的感知决定的。

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摘要

Potato defends against Phytophthora infestans infection by resistance (R)-gene-based qualitative resistance as well as a quantitative field resistance. R genes are renowned to be rapidly overcome by this oomycete, and potato cultivars with a decent and durable resistance to current P. infestans populations are hardly available. However, potato cultivar Sarpo Mira has retained resistance in the field over several years. We dissected the resistance of ‘Sarpo Mira’ in a segregating population by matching the responses to P. infestans RXLR effectors with race-specific resistance to differential strains. The resistance is based on the combination of four pyramided qualitative R genes and a quantitative R gene that was associated with field resistance. The qualitative R genes include R3a, R3b, R4, and the newly identified Rpi-Smira1. The qualitative resistances matched responses to avirulence (AVR)3a, AVR3b, AVR4, and AVRSmira1 RXLR effectors and were overcome by particular P. infestans strains. The quantitative resistance was determined to be conferred by a novel gene, Rpi-Smira2. It was only detected under field conditions and was associated with responses to the RXLR effector AvrSmira2. We foresee that effector-based resistance breeding will facilitate selecting and combining qualitative and quantitative resistances that may lead to a more durable resistance to late blight.
机译：马铃薯通过基于抗性（R）基因的定性抗性和定量田间抗性防御马铃薯疫霉菌感染。众所周知，R基因可以被这种卵菌菌迅速克服，并且几乎没有马铃薯品种对当前的致病疫霉菌种群具有体面和持久的抗性。但是，马铃薯品种Sarpo Mira在田间保留了数年的抗药性。我们通过将对致病疫霉RXLR效应子的反应与对不同菌株的种族特异性抗性进行匹配，剖析了隔离种群中“ Sarpo Mira”的抗性。抗性是基于四个金字塔定性R基因和与田间抗性相关的定量R基因的组合。定性的R基因包括R3a，R3b，R4和新近鉴定的Rpi-Smira1。定性抗性与对无毒力（AVR）3a，AVR3b，AVR4和AVRSmira1 RXLR效应物的反应相匹配，并被特定的致病疫霉菌株克服。确定了定量抗性是由新基因Rpi-Smira2赋予的。它仅在野外条件下检测到，并与对RXLR效应器AvrSmira2的反应相关。我们预见基于效应子的抗性育种将有助于选择和组合定性和定量抗性，这可能导致对晚疫病的更持久的抗性。

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