Inheritance of blast resistance in rice to two Pyricularia grisea races, IB-1 and IB-9

M. C. Filippi, A. Prabhu
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引用次数: 12

Abstract

Seven sources of resistance to the two predominant races IB-1 and IB-9 of the rice blast pathogen Pyricularia grisea were selected based on leaf blast reaction in tests conducted under controlled greenhouse conditions. Crosses involving resistant and susceptible parents were made to study the inheritance of the disease reaction for different sources of resistance. The F1 and F2 progenies of all crosses, including backcrosses to resistant and susceptible parents, were tested for reaction to leaf blast. The data showed that resistance is controlled by one to three genes that segregate independently in most of the donors. Non-allelic interaction among resistance genes, including dominant epistasis, was identified.
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水稻抗稻瘟病小种IB-1和IB-9的遗传
在控制温室条件下,根据叶片爆病反应筛选出7个抗稻瘟病病菌IB-1和IB-9两个优势小种的抗性来源。对不同来源的抗病亲本和易感亲本进行杂交,研究病害反应的遗传。对所有组合的F1和F2后代(包括抗性亲本和敏感亲本回交)进行叶瘟反应试验。数据显示,耐药性是由一到三个基因控制的,这些基因在大多数供体中独立分离。抗性基因之间的非等位基因相互作用,包括显性上位性。
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