入侵植物大狼把草对2种农作物的化感作用

Allelopathic Effect of Invasive Plant Bidens frondosa on Two Crops

运用水浸提法提取入侵植物大狼把草茎叶化感物质,通过对比试验研究了不同浓度的大狼把草茎叶水浸液对大麦和小麦种子萌发以及幼苗生长发育的影响.结果表明,大狼把草浸提液对大麦种子的萌发有显著抑制作用,对小麦种子萌发抑制作用不明显.除50 g/L浸提液外,其余处理对大麦和小麦苗高和根长均有显著的抑制作用.浸提液对2种作物根的分化均有一定抑制性,其中,对小麦根的分化抑制作用较大.大狼把草浸提液对小麦及大麦化感作用的综合效应为抑制作用,对大麦的抑制力大于小麦.

Using water extraction method to extract the allelopathic substances of invasive plant Bidens frondosa leaf and stem,by contrast test,the effects of different concentrations of aqueous extract of stem and leaf of Bidens frondos on seed germination and seedling growth of wheat and barley were studied.The results showed that the extract of Bidens frondos plants had significant inhibition on the germination of barley seeds,but not on the germination of wheat seeds.Except for 50 g/L extract,the other treatments significantly inhibited seedling height and root length of barley and wheat.The extracts could inhibit the differentiation of the roots of 2 crops.Among them,the inhibition on wheat root differentiation is relatively large.The synthetic allelopathic effect of Bidens frondosa extract on wheat and barley is inhibitory and the inhibition to barley is greater than that of wheat.