摘要
1985～1986年分析了Tetep等8个高抗稻瘟病品种对病菌小种ZB_(15)、ZC_3和ZC_(15)的抗性遗传,结果如下:Tetep、矮梅早3号、红阳矮4号、IR_(36)、IR_(9782)对每个小种的抗性都由1对显性抗性基因所控制.其中前4个品种的抗性基因都是等位的,对3个小种的抗性基因分别为基因1,4,9.IR_(9782)分别为基因2,6,12.水源300、矮脚白米仔和国际油占1号对3个小种的抗性由1对或2对显性重复抗性基因所控制.其中水源300对3个小种的抗性基因分别为基因1,4和5,9和10.矮脚白米仔分别为基因1,4和5,19和11.而国际油占1号分别为基因3,7和8,13.各抗病品种对不同小种的抗性基因间都存在着一定程度的连锁关系.抗性的表达可能受到一些修饰基因的影响,或者在同一基因位点上存在抗性程度不同的复等位基因.
Eight rice varieties, Tetep, Ai-mei-zao 3, IR 36, IR 9782, Suwon 300, Hong-yang-ai 4, Ai-jiao-bai-mi-zi and Guo-ji-you-zhan 1 were studied for inheritance of their resistance to three blast races ( Pyrtcularia oryzae Cav. ) , ZB15, ZC3, ZC15 in 1985-198G. Three dominant genes governed resistance to three blast races respectively in Tetep, Ai-mei-zao 3, Hong-yang-ai 4, IR 36, and IR 9782. Resistant genes in Tetep, Ai-mei-zao 3, Hong-yang-ai 4 and IR 36 were all allelic, and three genes in them were gene 1, 4 and 9 respectively. Three genes in IR 9782 were gene 2, 6 and 12. Resistance to each of the three races in Suwon 300, Ai-jiao-bai-mi-zi and Guo-ji-you-zhan 1 was controlled by a single dominant or two duplicate dominant genes. The resistant genes respectively were gene 1, 4 and 5, 9 and 10 in Suwon 300, gene 1, 4 and 5, 10 and 11 in Ai-jiao-bai-mi-zi and gene 3, 7 and 8, 13 in Guo-ji-you-zhan 1. Resistant genes to the three races in the cultivars were linked. Resistance expression might be affected by some modifier genes, or there might be multiple alleles with different level of resistance on the same locus.
关键词
籼稻
品种
稻瘟病
抗性
遗传
rice blast
resistant gene
allelic
linkage
