茭白种质资源收集及不同茭白品种对茭白胡麻斑病的抗性评价OA

To investigate key traits such as maturity,type,and resistance to leaf spot disease in different cultivars of water bamboo(Zizania latifolia),this study collected 116 water bamboo varieties from 13 provinces(municipali-ties)in China.Systematic investigations were conducted on the maturity and fleshy stem morphology of each variety,alongside the isolation and morphological identification of their endophytic Ustilago esculenta.Furthermore,resist-ance to water bamboo leaf spot(Bipolaris oryzae)was evaluated through artificial inoculation with physiological race LY-H1 and subsequent disease index rating.The results indicated that among the collected germplasm,there were 53 double-harvest varieties and 63 single-harvest varieties.Mid-maturing types were predominant in both groups.Doub-le-harvest varieties primarily exhibited conical stems,whereas single-harvest varieties were mostly elongated.Mean-while,103 endophytic U.esculenta strains were successfully isolated,with colony morphologies primarily classified into dense mycelium-type and spore-type.The dense mycelium-type exhibited three morphologies:curly growth type,adherent growth type,and elevated growth type,while the spore-type exhibited two morphologies:granular type and wrinkled type.Additionally,single-harvest varieties generally demonstrated stronger resistance to B.oryzae than double-harvest varieties.This study provides valuable germplasm materials and a scientific foundation for the collec-tion,conservation,evaluation,and disease-resistant breeding of water bamboo resources.