Genetic diversity within and between sulfonylurea‐resistant and susceptible populations of Schoenoplectus juncoides in Japan. (23rd May 2013)

• Record Type: Journal Article
• Authors: Imaizumi, T; Kataoka, Y; Ogata, S; Uchino, A; Neve, Paul
• Is Part Of: Weed research. Volume 53:Number 4(2013:Aug.)
• Page Start: 290
• Page End: 298
• Publication Date: 2013-05-23
• Subjects: Weeds -- Control -- Periodicals; Herbicides -- Periodicals; 632.5
• DOI: 10.1111/wre.12027
• Languages: English
• ISSNs: 0043-1737

Abstract

<abstract abstract-type="main" id="wre12027-abs-0001"> <title>Summary</title> <p>To reveal the effects of herbicide selection on genetic diversity in the outcrossing weed species <italic>Schoenoplectus juncoides</italic>, six sulfonylurea‐resistant (SU‐R) and eight sulfonylurea‐susceptible (SU‐S) populations were analysed using 40 polymorphic inter‐simple sequence repeat loci. The plants were collected from three widely separated regions: the Tohoku, Kanto and Kyushu districts of Japan. Genetic diversity values (Nei's gene diversity, <italic>h</italic>) within each SU‐S population ranged from <italic>h </italic>=<italic> </italic>0.125 to <italic>h = </italic>0.235. The average genetic diversity within the SU‐S populations was H<sub>S</sub> = 0.161, and the total genetic diversity was H<sub>T</sub> = 0.271. Although the H<sub>S</sub> of the SU‐R populations (0.051) was lower than that of the SU‐S populations, the H<sub>T</sub> of the SU‐R populations (0.202) was comparable with that of the SU‐S populations. Most of the genetic variation was found within the region for both the SU‐S and SU‐R populations (88% of the genetic variation respectively). Two of the SU‐R populations showed relatively high genetic diversity (<italic>h </italic>=<italic> </italic>0.117 and 0.161), which were comparable with those of the SU‐S populations. In contrast, the genetic diversity within four SU‐R populations was much lower (from <italic>h = </italic>0 to 0.018) than in the SU‐S populations. The results suggest that selection by sulfonylurea herbicides has decreased genetic diversity within some SU‐R populations of <italic>S. juncoides</italic>. The different level of genetic diversity in the SU‐R populations is most likely due to different levels of inbreeding in the populations.</p> </abstract>