111份大豆种质资源苗期耐旱性鉴定OA

Drought is the main abiotic stress that restricts agricultural production.During the seedling stage of Glycine max,plants are extremely sensitive to water stress and drought directly affects plant growth and yield.In order to screen out excellent Glycine max germplasm resources with drought re-sistance,111 domestic and foreign Glycine max germplasm resources were used as materials.The pot weighing method was adopted to set up 2 treatment groups:normal water supply and drought stress.The drought resistance coefficients of 7 traits such as SPAD value,plant height,stem diameter,a-bove-ground fresh weight,above-ground dry weight,underground fresh weight and underground dry weight were measured.Principal component analysis,membership function method and cluster analy-sis were used for comprehensive evaluation.The results showed that all traits were significantly inhib-ited under drought stress,among which the underground fresh weight decreased the most(64.57％)and the coefficient of variation was the highest(28.95％).Through principal component analysis,the 7 related traits were reduced to 4 principal components.Among them,the load of underground fresh weight was the largest and could be used as the core indicator for screening drought-resistant Glycine max germplasm resources.The D value was calculated by membership function for comprehensive e-valuation and classified.The 111 materials were divided into 4 categories:strong drought-resistant type(4.5％),moderate drought-resistant type(47.7％),weak drought-resistant type(41.4％)and sensitive type(6.3％).Among them,numbers N82,N95,N106,N48 and N50 were strong drought-resistant germplasm.