Impact of allelochemical exuded from allelopathic rice on soil microbial community

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	Impact of allelochemical exuded from allelopathic rice on soil microbial community
	Kong, CH; Wang, P; Zhao, H; Xu, XH; Zhu, YD; Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2008
卷号	40 期号:7 页码:1862-1869
关键词	Oryza Sativa L. Allelopathy Flavone O-glycoside Root Exudates Microbial Community Rhizosphere
ISSN号	0038-0717
英文摘要	Allelopathic rice releases allelochemicals from its roots to paddy soils at early growth stages to inhibit neighboring weeds. However, little is currently known about the effects of allelochemicals on soil microbes. In this study, we show that allelopathic rice can have great impact on the population and community structure of soil microbes. Allelopathic rice P1312777 seedlings reduced the culturable microbial population and total PLFA when compared to non-allelopathic rice Liaojing-9. Similar results were observed when, instead of growing seedlings, soils were incubated with plant root exudates. This result demonstrates that the composition of root exudates from the rice varieties tested contributes to the soil microbial community. Further experiments showed that the microbial community was affected by the allelochemical 5,4'-dihydroxy-3',5'-dimethoxy-7-O-beta-glucopyranosylflavone exuded from allelopathic rice roots, through immediately hydrolyzing glucose with stimulation on soil bacteria and aglycone (5,7,4'-trihydroxy-3',5'-dimethoxyflavone) with inhibition on soil fungi. This result indicates that the flavone O-glycoside can provide carbon and interact with soil microbes. PC analysis of the fatty acid data clearly separated the allelopathic P1312777 and the non-allelopathic Liaojing-9 variety (PC1 = 46.4%, PC2 = 20.3%). Similarly, the first principal component (PC1 = 37.4%) together with the second principal component (PC2 = 17.3%) explained 54.7% of the variation between the allelopathic and non-allelopathic root exudates. Furthermore, the canonical correlation between allelopathic root exudates and the flavone O-glycoside was statistically significant (Canonical R = 0.889, chi(2) (25) = 69.72, p = 0.0041). Although the data generated in this study were not completely consistent between culturable microbes and PLFA profile, it is a fact that variation in soil microbial populations and community structures could be distinguished by the allelopathic and non-allelopathic rice varieties tested. Our results suggest that individual components of rice root exudates, such as allelochemicals from allelopathic rice, can modify the soil microbial community. (C) 2008 Elsevier Ltd. All rights reserved.
学科主题	Soil Science
语种	英语
WOS记录号	WOS:000257616100036
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54417]
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, Wenhua Rd 72, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Kong, CH,Wang, P,Zhao, H,et al. Impact of allelochemical exuded from allelopathic rice on soil microbial community[J]. SOIL BIOLOGY & BIOCHEMISTRY,2008,40(7):1862-1869.
APA	Kong, CH,Wang, P,Zhao, H,Xu, XH,Zhu, YD,&Kong, CH, Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd 72, Shenyang 110016, Peoples R China.(2008).Impact of allelochemical exuded from allelopathic rice on soil microbial community.SOIL BIOLOGY & BIOCHEMISTRY,40(7),1862-1869.
MLA	Kong, CH,et al."Impact of allelochemical exuded from allelopathic rice on soil microbial community".SOIL BIOLOGY & BIOCHEMISTRY 40.7(2008):1862-1869.