水稻细菌性条斑病和白叶枯病抗性遗传研究

分析了Ｈａｓｈｉｋａｌｍｉ，Ｄｕｌａｒ和９０ＩＲＢＢＮ４４三个抗源品种对水稻细菌性条斑病Ｓ－１０３菌株和白叶枯病Ｐ１菌系的抗性遗传。结果表明，Ｈａｓｈｉｋａｌｍｉ和Ｄｕｌａｒ对Ｓ－１０３的抗性均由２对隐性基因所控制，９０ＩＲＢＢＮ４４则带有１对隐性抗性基因。经等位性测定表明，Ｈａｓｈｉｋａｌｍｉ和Ｄｕｌａｒ的２对基因中至少有１对是等位的，但它们与９０ＩＲＢＢＮ４４的１对基因均不等位。３个抗源品种对Ｐ１的抗性都受１对隐性基因控制，该基因与ｘａ－５等位。连锁遗传分析表明，Ｈａｓｈｉｋａｌｍｉ和Ｄｕｌａｒ对Ｓ－１０３的２对抗细条病基因中的１对与ｘａ－５相连锁，而９０ＩＲＢＢＮ４４的１对抗性基因与ｘａ－５呈独立遗传。本文还就开展水稻抗细菌性条斑病育种进行了讨论。

Studies on the Inheritance of the Resistance of Rice to BacterialLeaf Streak and Bacterial Leaf Blight

The inheritance of the resistance of three resistant rice varieties, Hashikalmi , Dular and 90IRBBN44, to S- 103 isolate of bacterial leaf streak and P1 strain of bacterial leaf blight was analysed. The results indicated that Hashikalmi and Dular had two recessive resistant genes to S- 1 03, and 90IRBBN44 had one recessive gene. According to allelism test , at least one of the two genes of Hashikalmi and Dular was allelic,but they were nonallelic to that of 90IRBBN44. All three resistant varieties possessed a recessive resistant gene to P1 , which was allelic to xa-5. One of the two genes of Hashikalmi and Dular resistant to S-1 03 was link to xa-5, but the gene of 90IRBBN44 was independent of xa-5. Breeding for resistance to bacterial leaf streak in rice was discussed.