Inheritance of Resistance of Rice Varieties Kogyoku and Java 14 to Bacterial Group V of Xanthomonas oryzae

Abstract

The inheritance of the resistance of rice varieties Kogyoku and Java 14 to bacterial group V of Xanthomonas oryzae was studied.
From F₂ data of five hybrids, Kinmaze×Kogyoku, Kinmaze×Java 14, Java 14×Kogyoku, Wase Aikoku 3×Kogyoku and Wase Aikoku 3×Java 14, it was revealed that the resistance of Kogyoku to bacterial group V was governed by one dominant gene, which was designated as Xa-kg, and that the resistance of Java 14 to the group V was also governed by Xa-kg or another dominant gene allelic to Xa-kg or linked very closely with it.
Evidence from allele tests with the known genes, Xa-1 and Xa-w, for resistance to X. oryzae indicated that Xa-kg was independent of Xa-w and closely linked with Xa-1, and the recombination value between Xa-1 and Xa-kg was calculated at about 2%.
It was further revealed that the resistance of Java 14 to X. oryzae was controlled by three dominant genes, Xa-1, Xa-w and Xa-kg, or other three genes allelic to these genes of linked very closely with them.