盐胁迫对金牌美达丽和猎狗种子萌发的影响

用不同浓度的NaCl、KCl、MgSO4和 3种盐的复合溶液胁迫金牌美达丽和猎狗种子 ,观察其发芽率和萌发后子叶及胚根生长情况 ,对其进行生态阈限分析。结果表明 :金牌美达丽和猎狗种子萌发对盐生境的适应性均很强。低浓度NaCl、KCl及复合盐溶液对猎狗种子萌发有促进作用。随盐胁迫强度上升 ,发芽率呈逐渐下降趋势 ,高浓度盐明显延缓种子的初始萌发时间 ,抑制幼苗正常生长。高浓度盐显著降低种子发芽率 ,但不同盐分对种子发芽率影响不显著。MgSO4溶液对种子发芽率没有显著抑制现象 ,但对金牌美达丽胚根的生长有明显抑制作用

EFFECT OF SALT STRESS ON SEED GERMINATION OF LOLIUM PERENNE L.AND FESTUCA ELATA KENG.

Two kinds of turf grasses, Lolium perenne L. and Festuca elata Keng., were treated with different concentration of NaCl, KCl, MgSO 4 and the mixture of the three salts above for 15 days. Their relative germination percentage, growth status of their roots and leaves and ecological limit analysis were determined .The results showed that stronger adaptation of Lolium perenne L. and Festuca elata Keng. to the saline environment were approved. Lower concentrations of NaCl, KCl, MgSO 4 and their mixture promote seed germination of Festuca elata Keng.. However germination percentage decreased prominently with increasing of NaCl, KCl and the mixture concentration, different salts affected the seed germination percentage unsignificantiy. Higher concentration of the salts delayed the seed primary germination time and inhibited the seedling normal growth. MgSO 4 had no prominent inhabitation to the germination percentage of Lolium perenne L. and Festuca elata Keng., but roots growth of Lolium perenne L. was inhibited significantly.