벼 흰잎마름병 저항성 유전자 집적

Abstract

Conventional breeding method was used to pyramid three bacterial blight resistance genes, Xa1,Xa2 and Xa3. Breeding lines with two and three resistance genes were developed and tested for resistance to the bacterial blight pathogen. Homozygous F plants with two or three resistance genes were readily selected based on the F resistance phenotypes. As was expected from the parental levels, the pyramiding lines showed a combined level of resistance to the BB pathogen. The with Xa1 and Xa3 lines were highly resistant to race K and moderately resistant to races K and K. The lines with Xa2(Xa1) and Xa3 were highly resistant to races K and K, and moderately resistant to race K. Inter-allelic interactions between Xa1 and Xa3, and between Xa2 and Xa3 were detected. Xa1 for race K and Xa2 for race K, respectively showed dominant epistasis to Xa3.