外施ALA对盐胁迫下薄壳山核桃幼苗的生长发育的影响

Effects of application of ALA on growth and development of pecan seedlings under salt stress

以薄壳山核桃二年生苗为试材,研究不同浓度外源5-氨基乙酰丙酸（ALA）对盐胁迫下薄壳山核桃幼苗的生长发育影响。结果表明：25-100mg·L^-1的外源ALA处理能提高0.5%盐胁迫下薄壳山核桃幼苗的生物量、叶绿素含量和叶片抗氧化酶活性以及可溶性蛋白含量,降低相对电导率和MDA含量;其中100mg·L^-1 ALA处理0.5%盐胁迫下,幼苗各测试指标与对照（0.5%NaCl）存在显著差异,为试验中缓解盐胁迫的最佳浓度;而外施200mg·L^-1 ALA处理则抑制薄壳山核桃幼苗的生长发育。

Two year-old pecan seedlings were adopted as materials to investigate the effects of exogenous ALA on growth and development of seedlings under salt stress. Results showed that seedling biomass, leaf chlorophyll content, antioxidant enzyme activity and soluble protein content increased significantly when added 25--100 mg·L^-1 ALA, but relative electric conductivity and MDA content decreased. The growth of pecan seedling was suppressed and physiological metabolism of pecan was going worse under 0.5% salt stress. 0.5% salt solution with 100 mg·L^-1 ALA significantly alleviated the harm of salt stress to pecan seedlings. However, seedling growth was suppressed as ALA concentration further increased.