Germination traits of soybean BIL population under PEG stress and assessment of their drought tolerance

A backcross inbred line population was developed from a crossing between SNWS0048,a wild soybean and cultivar Jinda73.Traits related to seed germination of this population was examined under PEC stress,major indexes and drought tolerance of soybean seedlings were analyzed by principal component analysis method and membership function method.The result showed that greater germination index of drought tolerance,higher relative germinability,relative germination rate and relative germination index were preferred characteristics of drought-tolerant varieties under PEG stress.Water absorption and root traits were indirect indexes of evaluating drought-tolerance.The analysis of principal component and comprehensive subordinate function showed that 200 lines were divided into different drought tolerant levels.Out of them,10 drought tolerant lines were screened out.