title: 2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) and 6-methoxy-benzoxazolin-2-one (MBOA) levels in the wheat rhizosphere and their effect on the soil microbial community structure.
abstract: Despite increasing knowledge of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) and 6-methoxy-benzoxazolin-2-one (MBOA) as allelochemicals involved in the defense of wheat against pests, relatively little is known about their levels in the rhizosphere and interactions with the soil microbial community. This study quantified DIMBOA and MBOA in the wheat rhizosphere and analyzed the soil microbial community structure. MBOA rather than DIMBAO was found in the wheat rhizosphere, and its concentration varied with cultivars, plant densities, and growth conditions. Wheat could detect the presence of competing weeds and respond by increased MBOA in the rhizosphere. There was a linear positive relationship between the MBOA level in the wheat rhizosphere and soil fungi/bacteria. When DIMBOA was applied to soil, yielding MBOA increased soil fungi. There were different phospholipid fatty acid (PLFA) patterns in soil incubated with DIMBOA and MBOA. These results suggested that DIMBOA and MBOA could affect the soil microbial community structure to their advantage through the change in fungi populations.
authors.affiliation: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Ke-Jing
authors.initials: KJ
authors.lastname: Chen
authors.forename: Yong-Quan
authors.initials: YQ
authors.lastname: Zheng
authors.forename: Chui-Hua
authors.initials: CH
authors.lastname: Kong
authors.forename: Song-Zhu
authors.initials: SZ
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Xing-Gang
authors.initials: XG
authors.lastname: Liu
mesh_terms: D001419:Bacteria / Q000187:drug effects; D048588:Benzoxazines / Q000378:metabolism* / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D058441:Rhizosphere; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D014908:Triticum / Q000737:chemistry / Q000378:metabolism*
chemical_list: D048588:Benzoxazines; D012987:Soil; C050733:2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one