Blast resistance identification for wild rice from Guangxi and geographical distribution of resistant resources

ObjectiveResistance of wild rice in Guangxi to blast was studied to provide new resistant materials for breeding blast resistant rice and exploring blast resistant genes.MethodIdentification method of artificial inoculation was adopted to inoculate wild rice from Guangxi with rice blast mixed strains ZA1,ZB1,ZB15 and ZC15 at seedling stage and booting stage. Resistance of different wild rice materials to leaf blast and panicle blast was investigated,resis-tant and sensitive materials were counted. Statistic analysis was carried out based on the geographic origins of resistance materials.ResultOut of the common wild rice materials,188 materials were found to be resistant to leaf blast and nine materials were resistant to panicle blast,accounting for 11.85% and 0.58% respectively of the total;73 materials were found to be resistant to leaf blast and five materials were resistant to panicle blast from medicinal wild rice,accounting for 36.68% and 2.54% respectively of the total;nine materials from common wild rice and four materials from medicinal wild rice were found to be resistant to both leaf blast and panicle blast,accounting for 0.58%and 2.03%respectively of the total. Guigang and Wuzhou were areas where the most wild rice blast resistant materials in Guangxi were found.ConclusionThere are abundant wild rice resources with resistance to leaf blast in Guangxi,but lack resources with resis-tance to panicle blast or to both leaf blast and panicle blast. So resources with resistance to panicle blast and resistance to both leaf blast and panicle blast should be further explored.