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草业学报  2015 

酸、铝胁迫对苜蓿种子发芽和幼苗生长的影响

DOI: 10.11686/cyxb2014362, PP. 103-109

Keywords: 苜蓿,酸胁迫,铝胁迫,种子发芽,幼苗生长

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Abstract:

本试验采用水培法,以金皇后品种的紫花苜蓿为材料,探讨了酸(pH3.0,4.5,6.0,7.5)、Al3+(0,50,100,200mg/L)胁迫处理对苜蓿种子发芽和幼苗生长的影响。结果表明,随着酸度的增加对苜蓿种子发芽和幼苗生长的抑制作用增强,微酸(pH6.0)环境下几乎没有抑制作用,甚至有促进作用。溶液铝含量在0,50mg/L时,苜蓿生长正常,发芽率、发芽势、发芽指数、茎长、根长等均明显高于其他处理(P<0.05);当铝含量在100~200mg/L时,苜蓿种子发芽和幼苗生长受到严重抑制,发芽率、发芽势、发芽指数、茎长、根长等均显著低于(P<0.05)其他处理。酸、铝共同胁迫对苜蓿种子发芽和幼苗生长的影响大于单一胁迫对它的影响,当pH<4.5、Al3+浓度达到50mg/L以上时,即可对苜蓿芽苗的生长产生明显的抑制作用。

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