铝胁迫对菊苣种子萌发特性的影响

Effect of Aluminum on Germination of Chicory

以菊苣(Cichorium intybus L.)为试验材料,研究了铝胁迫对菊苣种子萌发特性的影响,结果表明:随铝离子浓度增加菊苣种子发芽率和发芽势均有所降低,降幅分别为2.05%~10.24%和3.43%~12.03%;在铝浓度大于50mg/L的处理中,菊苣发芽势虽有下降,但处理间差异不显著;在铝胁迫下,菊苣种子根生长受严重抑制,且变粗、易断、颜色加深,铝浓度达到200mg/L时,根停止生长;随着铝离子浓度的增加,种子根的耐受指数呈指数型下降趋势(y=239.26e^(-0.827x),R^2=0.942 3),苗长与种子根长呈显著正相关关系(R=0.900 8,p<0.05)。由此可见,铝胁迫对菊苣种子萌发及幼苗生长抑制作用明显,即菊苣对环境中铝的耐受性较差,因此,在酸铝土壤地区应该通过育种途径筛选出耐铝品种。

The germination characters of chicory （Cichorium intybus L.）seeds were observed in this study.The result showed that with increase of aluminum ions contention, the germination rate and germination potential of chicory seeds have declined 2.05%- 10.24% and 3.43%- 12.03% respectively compared with the controls.The seminal roots was inhibited under aluminum ions treatments,and the seminal roots has stop growing when the aluminum ions contention increased to 200 mg/L.The root resistance index was declined exponentially （y=239.26 e^-0.827x,R^2 =0.942 3） with the aluminum ions contention increasing,the seminal seedling and seminal roots were positive correlation （R= 0.900 8, p〈0.05）.The result indicated that the chicory has poorer tolerance to aluminum stress,so that aluminum-tolerance cuhivar should be selected in production of acid soil region with high aluminum.