Modification of barley powdery mildew resistance gene Ml-a12 by induced mutation

J. Torp, J. Jørgensen
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引用次数: 75

Abstract

Kernels from a barley line, 'Sultan-5', with powdery mildew resistance gene Ml-a12 were treated with mutagens. Among 10 381 M1 spikes progeny tested with Ml-a12 avirulent powdery mildew, 25 segregated mutants with infection types between 0–1 n and 3–4cn. The resistance of the mutants is race specific in the sense that it is expressed only with powdery mildew cultures that are Ml-a12 avirulent but not with an Ml-a12 virulent culture. Genetic analysis of 10 mutants revealed that 9 had mutant genes that were allelic to gene Ml-a12, and one had a recessive mutant gene inherited independently of Ml-a12 on which it acted as a suppressor. The high mutation frequency in gene Ml-a12 and the gradual inhibition of the expression of gene Ml-a12, by mutation or suppression, strongly supports the suggestion that the gene function is associated with incompatibility rather than with compatibility.Key words: barley, Hordeum vulgare, powdery mildew, Erysiphe graminis hordei, mutation, resistance, suppressor.
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大麦抗白粉病基因Ml-a12的诱变修饰
用诱变剂处理含有抗白粉病基因Ml-a12的大麦品系‘苏丹-5’的籽粒。在Ml-a12无毒白粉病的10 381个M1穗子代中,分离出25个侵染型在0-1 n ~ 3-4cn之间的突变体。突变体的抗性是种族特异性的,因为它只在Ml-a12无毒的白粉病培养物中表达,而不是在Ml-a12有毒的培养物中表达。对10个突变体的遗传分析表明,9个突变体具有与Ml-a12基因等位的突变基因,1个突变体具有独立于Ml-a12基因遗传的隐性突变基因,该基因在该突变体上起抑制作用。基因Ml-a12的高突变频率以及通过突变或抑制逐渐抑制基因Ml-a12的表达,有力地支持了基因功能与不亲和性而非亲和性相关的建议。关键词:大麦,普通小麦,白粉病,小麦赤霉病,突变,抗性,抑制因子。
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