火柴头根系分泌物的化感效应  

Allelopathic effect of Commelina benghalensis root exudates

作　　者：杨田甜[1,2] 杜海荣[1] 陈刚[1,2] 邓鹏[1] 甄伟伟[1] 

机构地区：[1]扬州大学生物科学与技术学院,江苏扬州225009 [2]扬州大学江苏省作物遗传生理重点实验室,江苏扬州225009

出　　处：《浙江农业学报》2011年第6期1078-1083,共6页Acta Agriculturae Zhejiangensis

基　　金：国家自然科学基金项目(30600073;30770344)

摘　　要：在农田生态系统中,作物晚发弱苗的部分原因是杂草向作物生长周围环境释放化感物质。本研究以疏水性根渗出液连续收集法(CRETS)收集火柴头根系分泌物,在室内采用培养皿滤纸和砂培法分别研究了火柴头根系分泌物对4种常见农作物种子萌发、幼苗生长的化感作用。结果表明:火柴头根系分泌物对高粱、玉米、绿豆和油菜具有不同程度的化感效应,化感效应响应强度由强到弱的顺序为:油菜>玉米>绿豆>高粱。对种子萌发和幼苗生长也存在明显的浓度效应,总体上呈现出低浓度(≤0.025 g·mL-1)促进,高浓度(≥0.050 g·mL-1)抑制的现象,且随着处理浓度的增加抑制作用逐渐增强。In the farmland ecosystem,one reason for the crop＇s postponed seed germination and weak seedling was attributed to the influence of allelochemicals released from the weeds.The root exudates of Commelina benghalensis were collected with a continuous trapping system.The allelopathic effects of the root exudates from Commelina benghalensis L on four crops-Sorghum vulgare,Zea mays,Vigna radiate and Brassica napus were investigated in seed germination and seedling growth with petri-dish and sand cultivation.The results showed that the root exudates from C.benghalensis had different allelopathic effects on the four crops,and varied with crop species in the descending order of Brassica napus Zea mays Vigna radiate Sorghum vulgare.Allelopathic index of seed germination and seedling growth depended on the concentration of root exudates,that is,when the concentration was lower than 0.025 g·mL-1,the germination and seedling growth of acceptors were promoted.While the concentration was over 0.050 g·mL-1,they were inhibited,and the level of inhibition was improved with the increase of the root exudates concentration.In conclusion,Brassica napus was inhibited more strongly than the other species at the same concentration.The results also indicated that the allelopathic effects of C.benghalensis to the four acceptors were not so strong in low concentration.

关 键 词：火柴头 化感效应 根系分泌物 

分 类 号：Q948.12[生物学—植物学]