伴生杂草播娘蒿对小麦的化感效应  

Allelopathic effects of companion weed Descurainia sophia on wheat.

作　　者：杨超[1] 慕小倩 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨凌712100

出　　处：《应用生态学报》2006年第12期2389-2393,共5页Chinese Journal of Applied Ecology

基　　金：国家"十五"科技攻关重点资助项目(2002BA516A04).

摘　　要：用室内生物测定方法,对播娘蒿浸提液处理过的不同品系小麦的萌发率、发芽指数、活力指数、根长、苗高、干重、鲜重以及综合效应进行了统计,对作用效果较明显的5个品系进行了丙二醛含量、叶绿素a和叶绿素b比值、胡萝卜素含量的测定以及有丝分裂指数的统计.结果表明,播娘蒿浸提液对所有供试小麦均具有一定的化感效应,但化感效应的强度在不同品系的小麦中存在差异.对效果较明显的5种供试小麦生理指标的测定结果表明,播娘蒿中化感物质的作用位点可能是小麦细胞膜.此外,试验结果还表明,播娘蒿浸提液对小麦的有丝分裂有抑制作用.By using the techniques of laboratory bioassay, this paper studied the effects of Descurainia sophia extract on the germination rate, germination index, vigor index, root length, shoot height, fresh weight, and dry weight of wheat, and measured the contents of MDA, Chla/Chlb and carotene as well as the karyokinesis index of 5 more sensitive wheat strains. The results showed that D. sophia extract had allelopathic effects on all test wheat strains, though the responses of the strains were significantly different. The test 3 physiological indices of 5 more sensitive wheat strains suggested that the action spot of the allelopathic substances of D. sophia might be the cell membrane of wheat, and the measurement of karyokinesis index indicated that D. sophia extract had inhibitory effects on wheat karyokinesis.

关 键 词：杂草 播娘蒿 小麦 化感效应 品系 

分 类 号：S451[农业科学—植物保护]