Genetic Analysis of the Relationship between the Browning Reaction and Bacterial Blight Resistance Gene Xa3 in Rice

概要

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The relationship between bacterial blight resistance gene Xa3 and browning reaction was genetically analyzed using F_2 plants from the cross of rice cultivar Kuntulan with Kinmaze. Kuntulan harbors resistance Xa3 and developes a browning reaction to avirulent races of Xanthomonas oryzae pv.oryzae, whereas Kinmaze has a typical susceptible reaction to all known Japanese races of X.o.pv.oryzae. The F_2 plants were tested for their resistance to avirulent race II strain of X.o.pv.oryzae and the development of browning. Of 337 F_2 plants tested, 251 had resistance to the strain. In all the resistant plants, a browning reaction developed around the point of inoculation. The remaining 86 had a susceptible reaction to the strain without a browning reaction. The F_2 population of Kuntulan×Kinmaze had a clear-cut segregation ratio of 3R:1S. These facts led to the conclusion that the browning reaction is a pleiotropic effect of Xa3.
日本植物病理学会の論文
2001-08-25