期刊
BREEDING SCIENCE
卷 66, 期 4, 页码 636-645出版社
JAPANESE SOC BREEDING
DOI: 10.1270/jsbbs.16062
关键词
Oryza sativa; Xanthomonas oryzae pv. oryzae; mutation; DNA marker; resistance by a recessive gene
Bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) is a chief factor limiting rice productivity worldwide. XM14, a rice mutant line resistant to Xoo, has been obtained by treating IR24, which is susceptible to six Philippine Xoo races and six Japanese Xoo races, with N-methyl-N-nitrosourea. XM14 showed resistance to six Japanese Xoo races. The F-2 population from XM14 x IR24 clearly showed 1 resistant : 3 susceptible segregation, suggesting control of resistance by a recessive gene. The approximate chromosomal location of the resistance gene was determined using 10 plants with shortest lesion length in the F-2 population from XM14 x Koshihikari, which is susceptible to Japanese Xoo races. DNA marker-assisted analysis revealed that the gene was located on chromosome 3. IAS16 line carries IR24 genetic background with a Japonica cultivar Asominori segment of chromosome 3, on which the resistance gene locus was thought to be located. The F-2 population from IAS16 x XM14 showed a discrete distribution. Linkage analysis indicated that the gene is located around the centromeric region. The resistance gene in XM14 was a new gene, named X2142. This gene is expected to be useful for resistance breeding programs and for genetic analysis of Xoo resistance.
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