镉对紫花苜蓿种子萌发与幼苗生长的影响研究

Effects of cadmium on seed germination and growth of alfalfa

  • 摘要: 试验研究Cd胁迫对紫花苜蓿种子萌发与幼苗生长的影响结果表明,Cd2+浓度为0~10mg/kg时对种子发芽率的影响不显著,但对发芽势的影响较明显;当浓度达30mg/kg后对发芽的抑制作用表现非常明显,发芽势和发芽率均急剧下降。不同浓度Cd2+对芽和幼根的生长均有明显抑制作用,且对根抑制作用大于芽,同时对活力指数的影响也表现显著;随Cd2+浓度的增加,其抑制作用不断增强,活力指数也随之下降;当浓度达到50mg/kg后幼苗生长几乎完全被抑制。

     

    Abstract: Effects of cadmium on alfalfa seed germination and growth were studied.The results show that the effects of cadmium on the germination rate of seeds are not significant when Cd2+ concentration ranges from 0mg/kg to 10mg/kg,but the effects on the germinating energy are significant.Once Cd2+ concentration is up to 30mg/kg,the germination of seeds is evidently inhibited with significantly decreased germinating energy and rate.Cd2+ with different concentrations all can inhibit the growth of buds and roots significantly,and has stronger inhibition on root than on plumule.Basically,with the increase of Cd2+ concentration,the inhibiting effect is enforced,and the index of seed vigor is decreased.The growth of seedlings is almost inhibited completely while Cd2+ concentration is up to 50mg/kg.

     

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