2011 Fiscal Year Final Research Report

Diffusion risk of herbicide resistance gene of ryegrass

Research Project

Project/Area Number	22870002
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Ecology/Environment
Research Institution	University of Tsukuba
Principal Investigator	SHIMONO Ayako 筑波大学, 生命環境系, 助教 (30401194)
Project Period (FY)	2010 – 2011
Keywords	遺伝子流動 / 浸透交雑 / 除草剤耐性 / 外来雑草 / 適応度
Research Abstract	Persistent herbicide application to weed species across vast areas promotes the rapid evolution of herbicide resistance among them. Ryegrass (Lolium spp) is one of the most reported herbicide-resistant weeds. Because ryegrass species is major weed of wheat field of wheat-exporting countries, their seeds are introduced into Japan as contaminants in imported wheat commodity. Herbicide resistant plants were detected in surrounding area of major ports. To assess diffusion risk of herbicide resistant gene in area without herbicide use, I analyzed (1) frequency of resistant progenies, (2) gene flow and spatial genetic structure of the species, and (3) origin of the herbicide resistant gene.