胜红蓟根系分泌物土壤浸提液在石榴枯萎病生物防治中的作用初探

为进一步明确胜红蓟根系分泌物在提高枯草芽孢杆菌控制石榴枯萎病的作用途径，以胜红蓟土壤提取液为研究对象，利用室内试验检测不同浓度胜红蓟土壤浸提液对生防菌枯草芽孢杆菌和石榴枯萎病菌生长的作用。结果表明，胜红蓟土壤浸提液对生防菌枯草芽孢杆菌的生长具有促进作用，而对石榴枯萎病菌没有明显的作用。以上结果说明，胜红蓟促进枯草芽孢杆菌控制石榴枯萎病防治效果主要是通过促进生防菌的生长而起作用，而对病原菌石榴枯萎病菌没有明显的直接抑制作用

Primary Study on Soil Extraction of Ageratum conyzoides Root Exudates on Disease of Pomegranate Wilt Biological Control

To clarity the mode of Ageratum conyzoides root exudates in promoting the biocontrol effect on pomegranate wilt, a laboratory experiment was conducted to examine soil solution of A. conyzoides root exudates on growth of the strain of Bacillus subtilis and the pathogen of Ceratocystis fimbriata. It was showed that soil solution of A. conyzoides root exudates promoted proliferation of B. subtilis. However, no obvious role was observed for root exudates of A. conyzoides in hypha growth of C. fimbriata. The results suggested that the effect of A. conyzoides on controlling pomegranate wilt relied on promoting the growth of B. subtilis, not by influencing the growth of C. fimbriata directly.