Soil Degradation of Parthenin-Does it Contradict the Role of Allelopathy in the Invasive Weed Parthenium hysterophorus L.?

被引:31
|
作者
Belz, Regina G. [1 ]
van der Laan, Michael [2 ]
Reinhardt, Carl F. [2 ]
Hurle, Karl [1 ]
机构
[1] Univ Hohenheim, Dept Weed Sci, D-70593 Stuttgart, Germany
[2] Univ Pretoria, Dept Plant Prod & Soil Sci, ZA-0002 Pretoria, South Africa
基金
新加坡国家研究基金会;
关键词
Allelochemical; Soil degradation; Preconditioning; Sesquiterpene lactone; TRANSFORMATION; SORPTION; ALLELOCHEMICALS; BIODEGRADATION; (-)-CATECHIN; PESTICIDES; DESORPTION; ATRAZINE; JUGLONE; ACIDS;
D O I
10.1007/s10886-009-9698-1
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The invasive success of Parthenium hysterophorus L. is thought to be partially attributable to allelopathy mediated by the plant metabolite parthenin. To assess the ecological significance of parthenin release from plant material, its persistence and phytotoxicity in soil was studied. Results show parthenin is rapidly degraded with an average DT (50) of 59 h under standard experimental conditions. Degradation was delayed in sterilized soils, at lower soil moisture, and higher parthenin concentrations. Higher temperatures, higher CECpot/clay content of soils, soil preconditioning with parthenin, and P. hysterophorus infestation accelerated degradation. Physico-chemical and biological processes are, therefore, expected to govern the fate of parthenin in soil. Parthenin exhibited low soil phytotoxicity and did not accumulate over time. Along with the indicated reduction in bioavailability and development of hormetic effects, results suggest that for parthenin to have detrimental allelopathic effects, it requires high P. hysterophorus densities that result in high soil levels of parthenin and soil conditions that favor the persistence of parthenin. In light of this, the ecological significance of parthenin is discussed.
引用
收藏
页码:1137 / 1150
页数:14
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