异龄苜蓿水浸液对其种子萌发的自毒效应  

Autotoxicity Effects of Aqueous Extracts of Different Aged Alfalfa on Seeds Germination

作　　者：王希[1] 沈禹颖[1] 高崇岳[1] 韩方虎[1] 周少平[1] 

机构地区：[1]农业部草地农业生态系统学重点实验室,兰州大学草地农业科技学院,兰州730020

出　　处：《草地学报》2008年第6期609-612,共4页Acta Agrestia Sinica

基　　金：国家重点基础研究发展规划项目(2007CB106804)

摘　　要：以甘肃庆阳、定西异龄陇东苜蓿(Medicago sativa L.cv.Longdong)植株为材料,用纸上发芽法,研究不同生长部位水浸液对其种子萌发的影响。结果表明:植株各部位水浸液对其种子萌发存在自毒作用,其中以花的水浸液抑制作用最强;庆阳4—6龄苜蓿水浸液的自毒作用最强,10龄后则有所减弱;在干旱条件下苜蓿胚根比胚芽对其水浸物更敏感,水浸液对其胚芽、胚根的抑制效应强于发芽率,建议4-6龄苜蓿应通过轮作克服其自毒作用。Alfalfa（Medicago sativa L.） plants of different aged stands were collected from Qingyang and Dingxi,Gansu Province on the Loess Plateau.The effects of aqueous extracts from different plant parts on alfalfa seed germination were investigated using filter paper method.The results showed that the aqueous extracts from alfalfa plant had inhibitive effects on seed germination and seedling growth,and extract from alfalfa flowers had the strongest inhibitory effect.Aqueous extract from Qingyang 4-6 year stand had the strongest inhibitory effect to hypocotyl length in comparison with the aqueous extract from Qingyang 10 year stand.Radical length was relatively more sensitive than hypocotyl length to autotoxic alleochemicals.Hypocotyl and radical elongation of alfalfa were inhibited more by alfalfa extracted solution than the germination.For 4-6 year stand alfalfa,rotation should be adopted to overcome the autotoxicity effects.

关 键 词：紫花苜蓿 水浸液 自毒作用 种子萌发 幼苗生长 

分 类 号：Q541[生物学—生物化学]