【作者】 陈志新； 李广鲁； 胡增辉； 冷平生；

【Author】 CHEN Zhi-xin;LI Guang-lu;HU Zeng-hui;LENG Ping-sheng;Garden Institute,Beijing University of Agriculture;

【机构】 北京农学院园林学院；

【摘要】 以冰叶日中花为试材,探讨了不同程度盐胁迫及外源钙离子对冰叶日中花种子萌发的影响。结果显示:轻度盐胁迫促进冰叶日中花种子的萌发,可以提高种子发芽指数、活力指数、胚根长和幼苗长,但对最终萌发率无显著影响;随着盐浓度的增加,种子萌发受到明显抑制,5项萌发指标均显著下降。加入低浓度的外源CaCl₂则不同程度缓解盐胁迫对冰叶日中花种子萌发的伤害,提高了种子的抗盐能力,但浓度过高会对冰叶日中花种子形成二次胁迫伤害,其中10mmol/L CaCl₂溶液对盐胁迫下种子的缓解效果最佳。更多还原

【Abstract】 Selecting ice plants as experimental materials,it aimed to study the effects of salt stress at different levels and exogenous calcium on the seed germination.The results showed that salt stress at lower levels could accelerate seed germination,enhancing germination index,vigor index,radicle length and seedling length but having no significant effect on the final germination rates.With the increase of salt levels,seed germination was obviously inhibited and the five germination indexes mentioned above declined significantly.Addition of exogenous CaCl₂ at lower levels could alleviate salt stress damage on the seed germination to different degrees,and improve salt tolerance of these seeds.However,exogenous CaCl₂ at higher levels could also bring a second salt tress damage on these seeds.It is found that 10 mmol/L CaCl₂ had the best effect on the alleviation of salt stress damage on ice plant seeds.更多还原