黄瓜品种资源芽苗期和幼苗期耐盐性及其评价指标研究

采用NaCl水溶液人工模拟盐胁迫,以多项指标的盐害系数为依据,比较了18个黄瓜品种资源在芽苗期和幼苗期的耐盐性及其两个时期耐盐性的相关性,并对两个时期各品种资源的耐盐性通过聚类分析进行了分类。结果表明:芽苗期的总盐害系数与发芽势、发芽率、发芽指数、下胚轴长、根长、地上部鲜重、根鲜重、活力指数的盐害系数的相关性达极显著水平;幼苗期与总盐害系数相关性达极显著水平的有地上部鲜重、地下部鲜重、地下部干重、壮苗指数、根/冠,达显著相关水平的有地上部干重,叶绿素a/b和叶绿素(a b)/类胡萝卜素的盐害系数与总盐害系数相关性不显著。从两个时期的聚类分析图来看,它们的耐盐性并不相同。黄瓜品种资源耐盐性的强弱在芽苗期和幼苗期表现明显不同。在进行黄瓜芽苗期耐盐性筛选时可以将发芽势、发芽率、发芽指数、活力指数、下胚轴长、地上鲜重、根鲜重综合起来作为评价指标。在对黄瓜幼苗期耐盐性鉴定时可以用地上部和地下部鲜重、地上部和地下部干重、壮苗指标、根/冠来衡量黄瓜材料在幼苗期耐盐性的强弱。

Salt tolerance and appraise mentindices of cucumber in sprout stage and seedling stage

By artificial simulated salt stress with NaCl aqueous solution,we compared 18 cucumber varieties' salt tolerance in their sprout stage and seedling stage respectively according to salt toxicity coefficient of indices determined as well as the correlation between their salt tolerance in the two stages and classified the 18 varieties according to their salt tolerance in the two stages by cluster analysis.The correlation among total salt toxicity coefficient and germination energy,germination rate,germination index,shoot height,root length,shoot fresh weight,root fresh weight and vigor index were extremely prominent in sprout stage.The correlation among total salt toxicity coefficient and shoot fresh weight,root fresh weight,root dry weight,index of seedling growth,root/shoot ratio reached extremely prominent level in seedling stage;while correlation among shoot dry weight,chlorophyll a/b,chlorophyll(a b)/ carotenoid was not prominent.Salt tolerance in the two growth stages was different according to the two cluster analysis figures.Cucumber varieties have obviously different salt tolerance in their sprout and seedling stages.Germination energy,germination rate,germination index,vigor index,shoot height,shoot fresh weight,root fresh weight can serve as indicators to appraise salt tolerance of cucumber varieties in sprout stage comprehensively.While shoot fresh weight,root fresh weight,shoot dry weight,root dry weight,index of seedling growth and root/shoot ratio can be used to appraise salt tolerance of cucumber varieties in seedling stage.