NaCl胁迫对热研2号柱花草种子萌发的影响

Impacts of salt stress on germination of Stylosanthes guianensis cv.Reyan No.2

以热研2号柱花草种子为试验材料,采用0%、0.2%、0.6%、1.0%、1.4%、1.8%共6个浓度的NaCl模拟盐胁迫,研究盐胁迫对热研2号柱花草种子发芽及幼苗生长的影响。结果表明:1.8%的NaCl能显著抑制热研2号柱花草的发芽率,其他浓度NaCl对柱花草发芽率影响不显著。不同浓度的NaCl对柱花草发芽势、发芽指数、活力指数、幼苗鲜重有促进和抑制作用,一定浓度促进,高浓度则起抑制作用。幼苗的根、下胚轴对盐胁迫较为敏感,0.6%的NaCl能显著抑制幼苗的根长和下胚轴长。

Stylosanthes guianensis cv.Reyan No.2was used to study the impacts of salt stress on seed germination and seedling growth treated with different concentrations of NaCl solution（0%,0.2%,0.6%,1.0%,1.4%and 1.8%）.The results showed that the germination rate decreased significantly under 1.8% NaCl solution stress,no significant influence was found under the rest concentrations.NaCl stress had both promoting and inhibitory impacts on germination potential,germination index,vigor index,seedling fresh weights,there were promoting impact under certain concentration and inhibitory impact under higher concentration.The lengths of roots and hypocotyls were more susceptible to NaCl stress and were significantly inhibited while the concentration reached 0.6%.