三七自毒与化感作用初步研究

采用生物测定方法,对三七的自毒与化感作用进行初步研究。结果表明:(1)三七种子萌发过程中的自毒作用随其播种密度不同而有一定差异,但无明显规律性。三七种子萌发过程中的分泌物对油菜生长具有化感作用,主要表现为对油菜种子发芽率、发芽指数及苗高的抑制效应;(2)三七水浸液对不同受体植物的化感作用不尽相同,对小麦主要表现为对苗鲜重、苗干重、根鲜重、苗高及须根数有不同程度的促进或抑制作用;对油菜则表现为对其种子发芽率具有抑制作用,而对苗鲜重、苗干重、根鲜重、最长根长具有促进作用;(3)三七存在明显的化感自毒作用,其自毒物质可能为影响其连作的一个重要因素。

Preliminary study on autointoxication and allelopathy of Panax notoginseng

Germination and early seedling growth bioassays were used to assess the autointoxication and allelopathy potential of Panax notoginseng which served as donors and P. notoginseng,wheat(Triticum aestivum),rape(Brassica campestris)as receptors. The results were as follows:(1)the autointoxication of P. notoginseng appeared some differences in different density,but showed no obvious regularity. The exudates from seed germination of P. notoginseng inhibited seed germination rate,germination index and seedling height of rape;(2)The allelopathic effects of water extract of P. notoginseng differed among receptors. The wheat showed different promotion or inhibition which mainly manifested in the seedling fresh weight,seedling dry weight,root fresh weight,root number of wheat growth. The water extract inhibited the germination rate,promoted the seedling fresh weight,seedling dry weight,root fresh weight,root length of rape;(3)The allelopathy and autointoxication of P. notoginseng was obvious,the substances may be an important factor affecting the continuous cropping