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苜蓿在同一地块种植四、五年后常开始衰退。这是什么原因呢?植物生理学家戴维 L.Dornbos Tr 和伊利诺生物活动要素研究单位的其他研究人员,从苜蓿的根和茎中分离出了具有毒性嫌疑之一的化合物 medicarpin。这种化学物质可推迟苜蓿种子萌发4小时、幼苗生长48小时。作用72小时后,使玻璃瓶中正在生长的幼苗高度比正常的降低40%。同时,在这段时间里苜蓿幼苗除去了多数 medicarpin,在48小时当 medicarpin 的量降低85%
Alfalfa in the same plot four or five years after planting often began to decline. What is the reason? Plant physiologist David D. Dornbos Tr and other researchers at the Illinois Department of Biological Activity Research have isolated medicarpin, one of the compounds suspected of being toxic, from roots and stems of alfalfa. This chemical can delay germination of alfalfa seeds for 4 hours and seedlings for 48 hours. After 72 hours, reduce the height of growing seedlings in glass bottles by 40% below normal. At the same time, alfalfa seedlings removed most of the medicarpin during this period, when the amount of medicarpin was reduced by 85% at 48 hours