不同环境因子对紫茎泽兰根系分泌物化感作用的影响?

以紫茎泽兰为供试材料，采用生测的方法，研究了不同环境条件下根系分泌物的化感作用，同时以没有处理的苗期的紫茎泽兰为对照，采用循环法和气质色谱联用技术，收集并分析了紫茎泽兰根系分泌物的组分和含量，探讨苗期紫茎泽兰不同环境条件下根系分泌物的差异。实验结果表明：自然条件和1000mg/kg浓度下，根系分泌物对旱稻的化感作用不明显，经蚜虫取食和农药处理的处理后，紫茎泽兰的化感作用会显著增强。GC-MS鉴定结果显示，物理损伤、农药处理和昆虫取食条件下，紫茎泽兰的根系分泌物主要化学物质种类组成相似，以酮类和酯类为主，主要化学物质含量具有差异性，主要化学物质含量的改变可能也是化感作用改变的原因

The Allelopathic Potential of Root Exudates from Ageratina adenophora Spreng on Different Conditions

This paper studied the allelopathy of root exudates from Ageratina adenophora Spreng seedings which grew on different conditions by bioassay. With the comparison of no treated immature Ageratina adenophora, root exudates from Ageratina adenophora on different conditions were collected by cyclic irrigation. Component content of root exudates were determined by Gas chromatography/mass spectrometry (GC/MS) to examine the difference of root exudates of Ageratina adenophora seedlings on different conditions. When the allelopathic potential of root exudates from Ageratina adenophora on the growth of upland rice were examined under indoor natural conditions and 1000 mg/kg, it indicated that the allelopathic inhibiting effect of root exudates from Ageratina adenophora were not significant. However, while the plants were treated with herbicide stress and aphid feeding, the allelopathy would be enhanced significantly. It showed after it was treated with physical damaged, herbicide stress and aphid feeding, the root exudates of Ageratina adenophora seedlings contained similar chemical compounds in which were mainly esters and ketones, and the content of primary components of root exudates from Ageratina adenophora was different by GC/MS, as well as the content of main components of root exudates maybe change the allelopathy of root exudates.