竹叶对萝卜幼苗生长的影响

采用琼脂混粉法研究了22属83种竹叶对萝卜幼苗生长的影响,结果表明:在2g·L^-1的添加浓度下,供试竹叶对萝卜幼苗表现出不同程度的抑制作用,且对根生长的抑制作用大于对胚轴生长和鲜重的抑制作用。刚竹属、簕竹属、大明竹属、牡竹属中,对根长的抑制率在50%以上的竹种分别占70.83%、71.43%、62.50%、85.71%;其它竹属的30种竹叶,有73.33%的竹种对萝卜幼苗根长的抑制率超过50%。淡竹、桂竹、孝顺竹、宜兴苦竹、长叶苦竹、甜龙竹、铺地竹和铁竹等8种竹叶对萝卜幼苗的抑制作用显著,对萝卜根的抑制率均在80%以上。结果对于竹类植物化感作用研究具有参考作用,对拓展竹叶资源的化学利用途径具有一定的指导意义。

Effect of bamboo leaves on the growth of radish (Raphanus sativus L.) seedlings

The effect of the bamboo leaves from 83 species in 22 genuses on the growth of radish seedlings was evaluated through the method of grinded plant tissue powder mixed with agar (PPA). The results showed that most of the tested bamboo leaves showed inhibitory effect under the concentration of 2 g·L^-1, and the inhibitory effect was higher on root than on hypocotyl and fresh weight. Of the 38 species bamboo leaves from Phyllostachys and Bambusa, 27 species inhibited root length by 50%. Tested species from Pleioblastus and Dendrocalamus showed strong inhibitory activity on radish root growth. Twenty-two of the 30 species bamboo leaves from the other genuses also had strong inhibitory activity on root. Eight species of bamboo, namely Phyllostachys glauca, Phyllostachys bambusoides, Bambus multiplex, Pleioblastus yixingensis, Pleioblastus china, Dendrocalamus brandisii, Sasa argenteastriatus and Ferrocalamus strictus, demonstrated strong herbicidal activity. The results have significance in the research of allelopathic effect of bamboo, and is also helpful to extend the chemical utilization of bamboo resources.