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首页> 外文期刊>Journal of genetics >Gene interactions and genetics of blast resistance and yield attributes in rice (Oryza sativa L.)
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Gene interactions and genetics of blast resistance and yield attributes in rice (Oryza sativa L.)

机译：稻瘟病抗性和产量特性的基因相互作用和遗传

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摘要

Blast disease caused by the pathogen Pyricularia oryzae is a serious threat to rice production. Six generations viz., P1, P2, F1, F2, B1 and B2 of a cross between blast susceptible high-yielding rice cultivar ADT 43 and resistant near isogenic line (NIL) CT13432-3R, carrying four blast resistance genes Pi1, Pi2, Pi33 and Pi54 in combination were used to study the nature and magnitude of gene action for disease resistance and yield attributes. The epistatic interaction model was found adequate to explain the gene action in most of the traits. The interaction was complementary for number of productive tillers, economic yield, lesion number, infected leaf area and potential disease incidence but duplicate epistasis was observed for the remaining traits. Among the genotypes tested under epiphytotic conditions, gene pyramided lines were highly resistant to blast compared to individuals with single genes indicating that the nonallelic genes have a complementary effect when present together. The information on genetics of various contributing traits of resistance will further aid plant breeders in choosing appropriate breeding strategy for blast resistance and yield enhancement in rice.
机译：由病原体稻瘟病菌引起的稻瘟病是对水稻生产的严重威胁。稻瘟病易感高产水稻品种ADT 43与抗近等基因系CT13432-3R杂交的六代，即P1，P2，F1，F2，B1和B2，带有四个抗稻瘟病基因Pi1，Pi2，结合使用Pi33和Pi54来研究抗病性和产量属性的基因作用的性质和大小。发现上位相互作用模型足以解释大多数性状中的基因作用。相互作用对生产分till的数量，经济产量，病斑数，感染叶面积和潜在疾病发生率是互补的，但其余特征观察到重复的上位性。在附生条件下测试的基因型中，与具有单个基因的个体相比，基因金字塔系对稻瘟病具有高度抗性，表明非等位基因一起存在时具有互补作用。有关抗性的各种贡献性状的遗传信息将进一步帮助植物育种者选择合适的育种策略，以提高稻瘟病抗性和增产。

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