种子萌发期38份偃麦草种质耐盐性评价

为评价偃麦草(Elytrigia repens)种子萌发期耐盐性强弱，采用常规纸上发芽法，以1.2%氯化钠和硫酸钠（质量比为1∶1）模拟盐胁迫，对38份偃麦草的发芽率、发芽势、胚芽长、胚根长、活力指数、萌发耐盐指数、萌发胁迫指数等进行测定。结果表明，盐胁迫降低了偃麦草种子的发芽率、发芽势、发芽指数、活力指数，抑制了其胚芽和胚根的生长，降低了偃麦草萌发性能；根据综合评价值，38份偃麦草材料的耐盐性由强到弱依次为E03、E31、E16、E17、E42、E26、E04、E25、E12、E38、E15、E36、E13、E32、E09、E21、E07、E08、E01、E29、E10、E18、E24、E28、E30、E23、E11、E39、E02、E34、E19、E35、E06、E40、E33、E41、E37、E27。

Evaluation on the salt tolerance of 38 germplasm resources of Elytrigria repens at seed germination stage

Based on simulation salt stress with mixture of 1.2% of NaCl∶Na2SO4(1∶1),the routine paper bed culture was used to estimate the salt tolerance of 38 germplasm resources of Elytrigria repens at the seed germination stage by measuring the germination rate,germination energy,germ length,embryonic root length,vitality index,germination salt tolerance index and germination stress index.The results of this study showed that the salt stress decreased the germination rate,germination energy,germination Index and vitality index of E.repens,inhibited the growth of E.repens germ and radical,and also decreased the germination characteristic of E.repens.According to the comprehensive evaluation value,the salt tolerance sequence of 38 E.repens accessions from high to low was E03,E31,E16,E17,E42,E26,E04,E25,E12,E38,E15,E36,E13,E32,E09,E21,E07,E08,E01,E29,E10,E18,E24,E28,E30,E23,E11,E39,E02,E34,E19,E35,E06,E40,E33,E41,E37,E27.