Study on Salt Tolerance of Gamma Ray Induced Mutants in 032 Soybean Cultivar in Greenhouse Condition

Study on salt tolerance of 35 lines derived gamma ray irradiation on 032 soybeancultivar (M2 generation) were conducted. Seeds of selected M1 lines were sown ingreenhouse with 3 levels of sodium chloride (30, 60 and 90 mM) in sandy culture infactorial experiment on the basis of randomized complete block design with 3 replicationsin 2008. After 60 days salinity treatment, the traits of stem length, root length, root nodenumber, plant fresh weight, dry weight of aerial part of plant, root dry weight and plantbiomass were recorded. Analysis of variance indicated that there were significantdifferences between salinity, lines and interaction between salinity and lines. Also resultsshowed significant differences in morphological traits. The observations showed the mostextensive variation range was belong to 320 Gy dose of gamma ray. In this study, 10 lineswere selected and they were tolerant to all salinity levels. These promising lines can beused as new germplasms to obtain new salt tolerance varieties in near future.