杜仲叶水提取物对几种农作物的化感作用

研究农林复合系统中杜仲枯落叶水浸提液对小麦、油菜、大豆和玉米种子萌发及幼苗生长的影响.结果表明,杜仲枯落叶水浸提液使受试农作物种子发芽指数显著降低.0.1 g·mL-1浸提液处理对4种农作物的发芽率有极显著的抑制作用.油菜、大豆和玉米种子在0.1 g·mL-1时均未长成幼苗,浸提液对其苗高和苗鲜质量有高质量浓度抑制,低质量浓度促进的双重效应.同时除0.005 g·mL-1浸提液对油菜根鲜质量无影响外,对其他3种作物的根长和根鲜质量有显著抑制作用.小麦的苗高、苗鲜质量、根长和根鲜质量均明显低于对照值.4种农作物的根系活力、细胞膜透性和过氧化氢酶活性同样反映了不同程度的化感效应,同时彼此相互作用.

Allelopathy of Eucommia ulmoides Oliver Leaf Aqueous Extracts on Other Crops

Aqueous extracts of Eucommia ulmoides Oliver withered leaves were used to test their allelopathic effects on the seed germination and seedling growth of wheat, rape, soybean, and corn in agroforestry system. The results showed that the aqueous extracts of Eucommia ulmoides Oliver withered leaves significantly decreased the seed germination index of the tested plants. Germination rate of the four crops was significantly inhibited by 0.1 g·mL^-1 extract treatment. At the concentration of 0.1 g·mL^-1 the aqueous extracts, the growth of crops was inhibited significantly, and no seedlings obtained in rape, soybean and corn. The aqueous extracts showed inhibitory effect on seedling height and seedling fresh weight at higher concentrations, but stimulative effect at lower concentrations. The aqueous extracts presented a strong inhibition on the root growth and root fresh weight of the three crops, except no effects on rape at concentration 0.005 g·mL^-1. For the seedling height, seedling fresh weight, root growth and root fresh weight of wheat, the aqueous extracts showed strong inhibition. Root activity, relative conductivity, and CAT activity not only reflected the allelopathic effects, but also related to each other.