论文部分内容阅读
以酸枣种子和1a生实生苗为材料,研究不同浓度NaCl胁迫下其种子萌发及幼苗伤害特性。结果表明,随着NaCl浓度的增加,酸枣种子发芽率、发芽指数和相对发芽率均不同程度下降;NaCl浓度为100mmol/L时,NaCl胁迫对种子的发芽率、发芽指数抑制作用达到显著水平,并且其相对盐害率也显著上升;酸枣种子的胚根、胚轴长度和生长速率随着NaCl浓度的增高均呈下降趋势,NaCl胁迫对酸枣胚根长度的不良影响大于胚轴长度。1a生实生苗随NaCl胁迫的加重,各处理膜透性和丙二醛含量的变化呈增加的趋势。酸枣叶片伤害度随着NaCl浓度增加而上升,经300mmol/L NaCl处理后第12天,其膜透性达最大值为50.1%,仍然能够存活。在低浓度的NaCl胁迫下,酸枣种子和幼苗均基本上没有受到盐害,但其耐盐特性存在差异,酸枣幼苗比种子耐盐。
The jujube seeds and 1a-seedlings were used as materials to study the seed germination and seedling injury under different NaCl stress. The results showed that the seed germination rate, germination index and relative germination rate of jujube were decreased with the increase of NaCl concentration. When NaCl concentration was 100 mmol / L, NaCl inhibited the seed germination rate and germination index remarkably, And the relative salt damage rate also increased significantly. The radicle, hypocotyl length and growth rate of jujube seeds decreased with the increase of NaCl concentration. The adverse effects of NaCl stress on the length of jujube root were longer than those of hypocotyls. With the aggravation of NaCl stress, the change of membrane permeability and MDA content of all the treatments showed an increasing trend. The injury degree of jujube leaves increased with the increase of NaCl concentration, and the membrane permeability reached 50.1% at the 12th day after treatment with 300mmol / L NaCl, which still survived. Under the low concentration of NaCl stress, the jujube seeds and seedlings were basically not affected by salt, but the salt tolerance characteristics were different. The jujube seedlings were salt-tolerant than the seed.