23种紫花苜蓿不同品种及器官间化感活性差异的研究

摘要

The allelopathic activities of different organs of 23 alfalfa species were studied using seedlings of lettuce and wheat as the receiver plants.The alfalfa plant tissue was ground to a powder and mixed with agar (PPA) in the laboratory.The growth of the two species of receiver plant seedlings were inhibited differently by different organs of the 23 alfalfa species and the inhibitory effects on radicals (or seminal roots) were higher than those on hypocotyls (or coleoptiles) at 1 g/L concentration.The susceptibility of lettuce to all alfalfa species was considerably higher than that of wheat.Of all the species,WL324,Aohan,Gannong No.1 and Gan-nong No.4 showed higher total activity against lettuce,while on wheat it was Gannong No.1,Gannong No.3,Gannong No.4 and Gongnong No.1.Although the inhibitions of 3 organs on the 2 species of receiver plants were clearly different,they showed a total trend of activities in the order roots>leaves>shoots.%以生菜和小麦为受体,采用琼脂混粉法对23个紫花苜蓿品种不同器官的化感作用进行了研究.结果表明,23种紫花苜蓿的根、茎、叶3种器官在1 g/L的粉末添加浓度下均不同程度的抑制了生菜和小麦幼苗的生长,且对胚根(或种子根)的抑制作用高于对胚轴(或胚芽鞘)的抑制,受体植物间生菜的敏感性显著高于小麦.各品种对生菜的综合化感活性相对较高的有WL324、敖汉、甘农1号和甘农4号,对小麦相对较高的有甘农1号、甘农3号、甘农4号和公农1号.各器官间对2种受体植物幼苗生长的抑制作用有明显的差异,但总体上以根的活性最高,叶次之,茎最低.