生态环境学报2016，Vol.25Issue(10)：1644-1652,9.DOI:10.16258/j.cnki.1674-5906.2016.10.008
紫云英苷在黄顶菊适生土壤中的迁移及降解
Migration and Degradation of Astragalin in the Suitable Soil forFlaveria bidentis
摘要
Abstract
The secondary metabolites of plant flavonoids have become one research hotspot on the invasion mechanism of alien plant in recent years. An exotic weed native to South America,Flaveria bidentis, is spreading in northern China where it forms dense monospecific patches threatening native aboveground biodiversity and agricultural production from 2001.F. bidentiscontains high amounts of astragalin, one flavonoid metabolite, which can inhibit seed germination and affect growth of neighboring plants, the movement and degradation of astragalin in the soil remain unclear after being released into the soil. The regular of the movement and degradation of astragalin in five soils was study. The mechanism of degradation astragalin was evaluated with soil enzyme activity and the high-throughput sequencing method. Results showed that theRf of astragalin was 0.14~0.51 with weak to moderate- mobility in five soils; The degradation of astragalin fitted well with a first-order kinetic equation, with astragalin concentrations decreasing rapidly and then maintaining relatively constant thereafter. The half-lives of astragalin in the non-sterilized soils were 2.68~18.55 h, and 111.8 h in the sterilized fluvo-aquic soil. The activities ofsoil dehydrogenase, polyphenol oxidase and β-glycosidase were all increased after adding astragalin. The high-throughput sequencing results showed that the diversity of soil microbial communities was changed and the relative abundances ofNocardioides,Sohingomonas,Novosphingobium,Pimelobacter,Aeromicrobium, Pedobacter,Lysobacter,Thermomonas,Mycoplana,Paenibacillus,Rhodococcus andMycoplasma was increased, these bacteria may be involved in the degradation of astragalin in soils.关键词
黄顶菊/紫云英苷/次生代谢物质/土壤迁移/微生物降解/高通量测序Key words
Flaveria bidentis/astragalin/secondary metabolite/soil movement/biodegradation/high-throughput sequencing分类
生物科学引用本文复制引用
张瑞海,宋振,付卫东,张婷,黄成成,朱昌雄,张国良..紫云英苷在黄顶菊适生土壤中的迁移及降解[J].生态环境学报,2016,25(10):1644-1652,9.基金项目
国家重点研发计划项目（2016YFSF03）；国家自然科学基金项目 （）
