复合盐碱胁迫对蒙古高原野韭种子萌发的影响

Effects of Salt-alkali Mixed Stresses on Seed Germination of Allium ramosum From Mongolia Plateau

以蒙古高原野韭种子为试材,模拟盐度和碱度各不相同的复杂盐碱条件,研究了混合盐碱胁迫对野韭种子萌发及幼苗生长的影响。结果表明:野韭种子萌发对低盐低碱具有一定适应性;但是随着盐碱胁迫的增强,野韭种子的发芽率、发芽势、发芽指数与对照相比均显著性下降,其中碱性盐所占的比例越大,下降程度越大;各胁迫处理均显著影响了胚轴的生长;将未萌发的种子转移至蒸馏水中复水后,高盐浓度和高pH最终发芽率是对照的44%,说明高盐高碱延缓了种子的萌发,也抑制了一些低活力种子的萌发;综合分析各胁迫处理种子萌发的各项指标,盐浓度、pH及其相互作用对野韭种子萌发有抑制作用,其中盐浓度是决定性的主导因素,pH的影响次之。

Allium ramosumfrom Mongolia Plateau was used to study effect of mixed stress（by mixing salinity and alkalinity in different molar ratios）on seeds germination and seedling growth of A.ramosum.The results showed that the low salt and low alkali environment had no significant effect on seed germination of A.ramosum.When alkaline salt proportion was larger,the degree of decline was greater.Seed germination percentage,germination potential and germination index were significantly reduced with increasing salinity and pH,which reduced more with the increasing the ratio of alkaline salt.Each stress treatment significantly affected the hypocotyl growth.Ungerminated seeds on each stress might germinate when they were transferred to distilled water.The final germination rate on high salinity and high pH was 44% of CK,indicating that high alkalinity and high salt delayed seed germination and inhibited the germinating of some low vigor seed.These germination indexes indicated salinity and alkalinity and their interaction had inhibited seed germination of A.ramosum,and the salinity was a dominant factor.