摘要
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。
Seeds and one-year old seedlings of wild jujube were used as materials,and the seed germina- tion and seedlings injury properties of wild jujube under different NaC1 concentrations were studied. Re- suits showed that with increasing of NaC1 concentrations, seed germination rate, germination index and rel- ative germination rate of wild jujube were decreased to different extents,its seed germination rate and ger- mination index were significantly inhibited when NaC1 concentration was 100 mmol/L,its relative salt inju- ry rate was increased; The length and growth rate of hypocotyls and radicle of wild jujube were significant- ly decreased with increasing of salt concentration, harmful effects of salt stress on the radical length were remarkably higher than that on hypocotyl length. Membrane permeability and MDA content of one-year old seedlings of wild jujube were increased with increasing of NaC1 stress. Although leaf harmful rate of seed- lings of wild jujube were increased with increasing of NaC1 concentrations,NaCl concentrations were in- creased by 300 mmol/L,its membrane permeability was less than 50% for 12 days of NaC1 stress and it was still alive under 300 mmol/L of NaC1 concentration. In a word,wild jujube seeds and one-year old seed- lings had not been injured basically under low concentration NaC1 stress, but their salt tolerance was different,among them salt tolerance of seedlings was stronger than that of seeds.
出处
《新疆农业大学学报》
CAS
2012年第4期312-316,共5页
Journal of Xinjiang Agricultural University
基金
新疆农业大学大学生创新项目(jqzyp42011031)
新疆维吾尔自治区林果实验教学示范中心项目
关键词
酸枣
耐盐性
种子萌发
wild jujube
NaC1 stress
seed germination
