盐碱地绒毛白蜡和苦楝种子抗盐萌发机理

将盐碱地和正常地上采集的绒毛白蜡(Fraxinus velutina)和苦楝(Melia azedarach)种子在不同盐浓度下做发芽实验,测定两类种子的发芽指标和幼苗的生理生化指标,比较两种种子在不同盐胁迫下的发芽情况、幼苗保护性酶活性、可溶性蛋白和丙二醛含量的差异.结果表明:绒毛白蜡比苦楝种子抗盐萌发能力强,比较适合在盐碱地上种植.正常地上采集的两类种子的各项发芽指标高于盐碱地上采集的相应种子,产自正常地的绒毛白蜡种子活力随盐胁迫的增强而逐渐增大,苦楝却相反.盐碱地上采集的两类种子形成的幼苗的保护酶活性、可溶性蛋白含量高于正常地上采集的相应种子形成的幼苗,以绒毛白蜡幼苗为最高;丙二醛含量则是产自盐碱地的幼苗低于正常地幼苗,以绒毛白蜡为最低.

Germination Characteristics of Fraxinus velutina and Melia azedarach Seeds in Saline Land

Germination tests were performed on Fraxinus velutina and Melia azedarach seeds in saline and non-saline land under different NaCl stress. The germination indexes and biochemi- cal indexes of the seedlings were measured to study the differences in germination abilities and protective enzymes. The salt resistance of F. velutina was better than that of M. azedarach seeds and the former was much fitter for cultivation in saline than the later. The germination abilities of the 2 kinds of seeds from non-saline land were better than those from saline land; the more NaCl stress, the stronger vigor of F. velutina, and vice versa with M. azedarach. But the activity of protective enzymes and content of soluble protein of seeds from saline land were higher (F. velutina seedlings had the highest activity) and the content of MDA was less (F. velutina seedlings had the lowest content) than those of seedlings from non-saline land.