Two compounds from allelopathic rice accession and their inhibitory activity on weeds and fungal pathogens

文献类型： 外文期刊

第一作者： Xu, XH

作者： Xu, XH;Zhou, B;Hu, F;Zhang, CX;Zhang, MX

作者机构：

关键词： Oryza saliva;Graminae;Rice;Allelopathy;Flavone and cyclohexenone;Identification;Allelochemicals;Seedlings;Germplasm;Extracts;Example;Growth;Plants;Straw.

期刊名称：PHYTOCHEMISTRY （ 影响因子：4.072； 五年影响因子：4.132 ）

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收录情况： SCI

摘要： A flavone (5,7,4'-trihydroxy-3,5'-dimethoxyflavone), a cyclohexenone (3-isopropyl-5-acetoxycyclohexene-2-one-1) and a liquid mixture of low polarity, containing long-chain and cyclic hydrocarbons, were isolated from leaves of allelopathic rice accession PI 312777 using column chromatography. Their structures and constituents were identified by means of HR-MS, NMR and GC/MS analyses, respectively. Bioassays showed that both the flavone and cyclohexenone significantly inhibited the growth of weeds Echinochloa crus-galli, Cyperus difformis and Cypertus iris, and the spore germination of fungal pathogens Pyricularia oryzae and Rhizoctonia solani at all tested concentrations. Moreover, the combination of the inactive mixture of low polarity and the active flavone or cyclohexenone significantly enhanced the inhibitory activities on weed growth. In addition, the two compounds and the mixture of low polarity from the leaves of PI312777 did not inhibit the rice growth at the same concentrations. It was also established that both compounds could be released into the soil, and was especially induced by E. crus-galli. The results suggest that 5,7,4'-trihydroxy-3',5'-dimethoxyflavone and 3-isopropyl- 5-acetoxycyclohexene-2-one-1 may act as allelochemicals participating in the defense of rice against weeds and pathogens

分类号： Q946

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