不同苜蓿品种种子萌发期耐盐性的研究

用0(CK),0.2%,0.4%,0.6%,0.8%和1.0%溶液分别对15个苜蓿品种种子进行处理,通过发芽势、发芽率、幼根长和幼苗高对各品种种子萌发期耐盐性进行了研究,其品种间存在显著性差异(P0.05,P0.01)。结果表明:用0.6%,0.8%或1.0%NaCl溶液进行苜蓿种子萌发期耐盐性鉴定较为合理。1.0%NaCl溶液处理苜蓿种子,其幼根长及其幼苗高可作为苜蓿品种种子耐盐性鉴定的指标。对15个苜蓿品种种子的发芽率、幼根长、幼苗高、半致死浓度和耐盐极限浓度5个鉴定指标进行综合分析,结果表明:宁苜1号、龙牧801号、WL-525耐盐性最强,其次是龙牧803号,耐盐性最弱的为MagnumV-wet。

Study on Salt Tolerance of Different Alfalfa Varieties in Germinating Period

Salt to tolerance of 15 alfalfa varieties in geminating period was studied by measuring the germinating energy, germination rate, seedling height and root length under the treatments with 0(CK),0.2%,0.4%,0.6%,0.8% and 1.0% NaCl solution.There were significant differences in characteristics of growth and development(P＜0.05,P＜0.01). The results showed that 0.6%, 0.8% and 1.0% NaCl solutions were appropriate to identify the salt tolerance of alfalfa in geminating period. The root length and seedling height were regarded as two adaptive salt tolerant indexes under the treatment with 10% NaCl solution. By comprehensive analysis of germinating energy, seedling height, root length, medial lethal dose and medial lethal dose,the result showed that salt tolerance degrees of 15 alfalfa varieties were:‘Ningxia No1’,‘Longmu No801’ and‘WL-525’were strong,‘Longmu No803’was medium, and MagnumV-wet was weak.