盐胁迫对不同品种苜蓿种子发芽性状的影响

Effects of Salt Stress on Seed Germination Traits of Different Alfalfa Varieties

为了有效开展苜蓿品种耐盐性评价及耐盐材料筛选,以5个国外苜蓿品种和4个国内苜蓿品种为材料,采用不同质量浓度NaCl处理(2、4、6、8、10g/L),探讨了盐胁迫对苜蓿种子主要发芽性状(发芽率、苗长、根长、苗质量、根质量)的影响。结果表明,盐胁迫对苜蓿种子发芽性状均有较大影响,随着NaCl质量浓度的提高,苜蓿种子发芽率降低,苗长和根长明显缩短,苗质量和根质量逐步下降,而且,高质量浓度盐胁迫对苜蓿种子发芽性状的影响尤为显著。不同苜蓿品种对盐胁迫的响应差异较大,对9个苜蓿品种种子5个发芽性状耐盐性的综合分析表明,三得利的种子耐盐性最强,而伊犁苜蓿的耐盐性最弱。

In order to carry out the salt tolerance evaluation of alfalfa varieties and select the salt-tolerant alfalfa varieties,the effect of different concentrations of NaCI（2,4,6,8,10 g/L） on the main seed germination traits including germination rate, seedling length, root length, seedling weight and root weight was studied for five foreign alfalfa varieties and four internal alfalfa varieties. Results showed that the main seed germination traits were greatly affected by NaCl stress. With the increase of NaC1 concentration,the seed germination rate decreased significantly, the seedling length and root length shortened greatly,and the seedling weight and root weight also reduced gradually. The influence of high concentration of NaCl on seed germination traits was particularly noticeable. There was great difference among the alfalfa varieties in the response to NaCl stress. The comprehensive analysis of five seed germination traits was also carried out for nine alfalfa varieties, and the result showed that Sandeli had the strongest salt tolerance, while Yili alfalfa had the weakest salt tolerance.