Allelochemicals and their transformations in the Ageratum conyzoides intercropped citrus orchard soils

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	Allelochemicals and their transformations in the Ageratum conyzoides intercropped citrus orchard soils
	Kong, CH; Liang, WJ; Hu, F; Xu, XH; Wang, P; Jiang, Y; Xing, BS; Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Shenyang Expt Stn Ecol, Shenyang 110016, Peoples R China
刊名	PLANT AND SOIL
	2004
卷号	264 期号:1-2 页码:149-157
关键词	Ageratochromene Ageratum Conyzoides Biological Action Citrus Orchard Soil Dimerization Flavones Intercropping Remonomerisation Weed And Pathogenic Fungi
ISSN号	0032-079X
英文摘要	Intercropping Ageratum conyzoides in citrus orchards may effectively suppress weeds and control other pests. Investigations showed that the inhibition of major weeds and soil pathogenic fungi in citrus orchards was significantly correlated with the allelochemicals released into the soil by intercropped A. conyzoides. Three flavones, ageratochromene, and its two dimers were isolated and identified from the A. conyzoides intercropped citrus orchard soil. These allelochemicals had different biological actions on major weeds and soil pathogenic fungi in the citrus orchard. Three flavones and ageratochromene could significantly inhibit the growth of weeds Bidens pilosa, Digitaria sanguinalis and Cyperus difformis, and spores germination of soil pathogenic fungi Phytophthora citrophthora, Pythium aphanidermatum and Fusarium solani. However, two dimers of ageratochromene had no inhibitory actions on them. The presence of these allelochemicals in soils suggests that they may be able to make a major contribution to control some weeds and diseases in citrus orchards. Further studies revealed that dynamic transformation between ageratochromene and its two dimers in the A. conyzoides intercropped citrus orchard soil was reversible, that is, ageratochromene released from ground A. conyzoides plants was transformed into its dimers, and the dimers can be remonomerized in the soils. However, this dynamic transformation did not occur in the soil with low organic matter and fertility. The dimerization was not correlated with microorganisms in the soil, but the biodegradation of both ageratochromene and its two dimers may have occurred, particularly in the soil with low organic matter and fertility. Our results strongly suggest that the reversible transformation between ageratochromene and its dimers in the A. conyzoides intercropped citrus orchard soil can be an important mechanism maintaining bioactive allelochemicals at an effective concentration, thus, sustaining the inhibition of weeds and pathogenic fungi in soil.
学科主题	Agronomy ; Plant Sciences ; Soil Science
语种	英语
WOS记录号	WOS:000226001200013
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/55211]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Shenyang Expt Stn Ecol, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Kong, CH,Liang, WJ,Hu, F,et al. Allelochemicals and their transformations in the Ageratum conyzoides intercropped citrus orchard soils[J]. PLANT AND SOIL,2004,264(1-2):149-157.
APA	Kong, CH.,Liang, WJ.,Hu, F.,Xu, XH.,Wang, P.,...&Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Shenyang Expt Stn Ecol, Shenyang 110016, Peoples R China.(2004).Allelochemicals and their transformations in the Ageratum conyzoides intercropped citrus orchard soils.PLANT AND SOIL,264(1-2),149-157.
MLA	Kong, CH,et al."Allelochemicals and their transformations in the Ageratum conyzoides intercropped citrus orchard soils".PLANT AND SOIL 264.1-2(2004):149-157.