镉对紫花苜蓿种子萌发与幼苗生长的影响研究

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。

Effects of cadmium on seed germination and growth of alfalfa

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 Cd~(2 ) concentration ranges from 0mg/kg to 10(mg/kg),but the effects on the germinating energy are significant.Once Cd~(2 ) concentration is up to 30mg/kg,the germination of seeds is evidently inhibited with significantly decreased germinating energy and rate.Cd~(2 ) 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 Cd~(2 ) concentration,the inhibiting effect is enforced,and the index of seed vigor is decreased.The growth of seedlings is almost inhibited completely while Cd~(2 ) concentration is up to 50mg/kg.