Activity and allelopathy of soil of flavone O-glycosides from rice

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	Activity and allelopathy of soil of flavone O-glycosides from rice
	Kong, CH; Zhao, H; Xu, XH; Wang, P; Gu, Y; Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
刊名	JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
	2007
卷号	55 期号:15 页码:6007-6012
关键词	Oryza Sativa L. Allelopathy Flavone O-glycosides Bioactivity Soil Tlc Soil Dynamics
ISSN号	0021-8561
英文摘要	Two flavone O-glycosides were isolated from allelopathic rice seedlings and have been identified as 5,4'-dihydroxy-3',5'-dimethoxy-7-O-beta-glucopyranosylflavone and 7,4'-dihydroxy-3',5'-dimethoxy-5-O-beta-glucopyranosylflavone. Considerable levels of these glycosides could be found in allelopathic rice tissues. They could not be detected in the soils growing these allelopathic rice seedlings. Only their aglycone, 5,7,4'-trihydroxy-3',5'-dimethoxyflavone, could be found in the soil. Further experiments showed that two flavone O-glycosides were exuded from allelopathic rice roots to the rihzosphere and then transformed into their aglycone form, that is, 5,7,4'-trihydroxy-3',5'-dimethoxyflavone, with a great diversity of biological activities on associated weeds and microbes by soil interactions once released. The glycosides degraded rapidly (t(1/2) < 2 h), whereas their aglycone was more resistant toward degradation in paddy soils, in which the half-life (t(1/2)) at low (25 mu g/g) and high (200 mu g/g) doses reached 19.86 +/- 3.64 h (r (2) = 0.97) and 28.78 +/- 3.72 h (r (2) = 0.98), respectively. Furthermore, the mobility of both glycosides and their aglycone in paddy soil was evaluated by soil TLC with bioassay. The mobility of the glycosides (R-f = 0.418 +/- 0.069, n = 18) is higher than that of the aglycone (R-f = 0.361 +/- 0.048, n = 18). The results suggested that two flavone O-glycosides are formed in rice biosynthesis and that storage of the allelochemicals and their aglycone 5,7,4'-trihydroxy-3',5'-dimethoxyflavone is the agent of alleloapthic rice which interferes with weeds or microbes in paddy soil.
学科主题	Agriculture, Multidisciplinary ; Chemistry, Applied ; Food Science & Technology
语种	英语
WOS记录号	WOS:000248085300017
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54657]
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 110016, Peoples R China
推荐引用方式 GB/T 7714	Kong, CH,Zhao, H,Xu, XH,et al. Activity and allelopathy of soil of flavone O-glycosides from rice[J]. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,2007,55(15):6007-6012.
APA	Kong, CH,Zhao, H,Xu, XH,Wang, P,Gu, Y,&Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China.(2007).Activity and allelopathy of soil of flavone O-glycosides from rice.JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,55(15),6007-6012.
MLA	Kong, CH,et al."Activity and allelopathy of soil of flavone O-glycosides from rice".JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 55.15(2007):6007-6012.