NaCl胁迫对两种柳树幼苗生理特性的影响

Effect of physiological characteristics of two willows seedling under salt stress

文章以竹柳3号、苏柳172的1年生扦插苗为研究对象,测定不同浓度NaCl胁迫下幼苗的生长、根系活力、叶绿素和丙二醛含量、细胞膜透性等指标。结果表明,随着时间的延长和NaCl浓度增加,两种柳树幼苗单株鲜重、干重、成活率下降,根冠比增加,MDA含量、质膜透性增加,根系活力下降,竹柳根系活力随盐浓度的增加下降程度较苏柳小;两种柳树的叶绿素含量随盐胁迫时间的延长总体表现先增加后降低的趋势,随着胁迫浓度的增加表现出明显降低趋势,叶绿素a/b动态变化总趋势是先上升后下降。采用隶属函数法进行耐盐能力的综合评价,竹柳较苏柳耐盐能力强。

The paper studied bamboo willow 3 and Salix jiangsuensis CL J-172 to test seedling growth, root vigor, chlorophyll content, MDA content, cell membrane permeability and other index of the seedling treated by different concentrations of NaCI. The results showed that with the increasing concentration of NaCI, the fresh weight, dry weight,msurvival rate, root vigor of the two experimental materials showed a decline trend, the root cap ratio, MDA content, membrane permeability showed a rising trend; the root vigor change of bamboo willow was smaller than Salix jiangsuensis; the chlorophyll content of bamboo willow 3 and Salix jiangsuensis CL J-172 increased at the outset, then declined as the extension of salt stress; with the increasing concentration of salt, the chlorophyll content declined significantly. The content of chlorophyll a/b showed the similar trend as chlorophyll content. The evaluation of salt tolerance of the two kinds materials by subordinate function proved that bamboo willow was more tolerant to salt stressed than Salixjiangsuensis.