角茴香根和地上部水浸液对杂草反枝苋的化感作用

Allelopathy of the Aqueous Extracts from the Root and Aerial Part of Hypecoum erectum L.on Amaranthus retroflexus L.

以常见杂草反枝苋为受体植物,采用培养皿滤纸法,通过测定角茴香根水浸液和地上部水浸液对杂草反枝苋的种子萌发和幼苗生长的影响。结果表明:不同浓度的角茴香根和地上部水浸液均对反枝苋种子的萌发和幼苗的根长产生了明显的抑制作用,且随着浓度的增加抑制作用增强,当各水浸液的浓度大于0.030 g.mL-1时,即可对反枝苋种子72 h萌发的抑制率达到50%以上;当各水浸液处理浓度大于0.010 g.mL-1时,反枝苋幼苗的根长便低于对照的50%。角茴香根水浸液对反枝苋幼苗的下胚轴产生低促高抑的浓度双重效应,当根水浸液浓度小于0.030 g.mL-1时,促进反枝苋下胚轴的生长;当根水浸液浓度大于0.030 g.mL-1时,抑制反枝苋下胚轴的生长。研究发现,角茴香根和地上部水浸液均对反枝苋表现出明显的化感作用。

The allelopathy of the aqueous extracts from the root and aerial part of Hypecourn erectum L. on seed germination and seedling growth of Amaranthus retroflexus L. were studied by adopting petridish bioassay. The primary results showed that the aqueous extracts from the root and aerial part of Hypecoum erectum L. with different concentrations inhibited the seed germination and root length of A. retroflexus L. , and the suppression increased with the increase of the concentration of aqueous extracts. Furthermore, there were dual effects on hypocotyl length of A. retroflexus L. As the concentration of aqueous extracts from the root of H. erectum was lower than 0. 030 g·mL-1, the growth of hypocotyls was promoted, while higher than 0. 030g·mL-1 could restrain the growth.