Mechanisms of action and selectivity of the cyclohexen-one herbicide cycloxydim (BAS 517)

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dc.contributor.authorLi, Hwei-Yiingen
dc.contributor.committeechairFoy, Chester L.en
dc.contributor.committeememberDerr, Jeffrey F.en
dc.contributor.committeememberHatzios, Kriton K.en
dc.contributor.committeememberParrish, Daviden
dc.contributor.committeememberYoung, Roderick W.en
dc.contributor.departmentPlant Physiology and Weed Scienceen
dc.date.accessioned2014-03-14T21:21:34Zen
dc.date.adate2005-10-19en
dc.date.available2014-03-14T21:21:34Zen
dc.date.issued1990-09-27en
dc.date.rdate2005-10-19en
dc.date.sdate2005-10-19en
dc.description.abstractThe activity and the selectivity of cycloxydim {2-[1-(ethoxyimino)butylJ-3-hydroxy- 5-(2H-tetrahydrothiopyran-3-yl)-2-cyclohexen-l-one}, code designation BAS 517, were examined flIst with etiolated seedlings of com (Zea mays L.) and soybean [Glycine max (L.) Merr.]. Etiolated soybean seedlings were not affected by cycloxydim. The degree of growth inhibition of com varied with concentration of cycloxydim and incubation time. Compared to mesocotyls and coleoptiles, radicles of corn were the most sensitive to cycloxydim. Meristematic tissues appeared to be the site of action of cycloxydim as root meristems were the first to show symptoms. A band of reddening tissue developed at meristematic tips followed by the complete cessation of root growth. In a study comparing activities of technical grade and formulated cycloxydim and sethoxydim, {2-[ l-(ethoxyimino )butyl}- 5-[2-(ethylthio )propy11-3-hydroxy-2-cyclohexen-l-one}, formulated compounds were more potent than the technical grade chemicals without formulation additives. Technical sethoxydim was more potent than technical cycloxydim. Root tips excised from com and soybean seedlings were used subsequently for cycloxydim treatments. The activity and selectivity of cycloxydim expressed at the isolated root tip level were similar to those of cycloxydim bioassayed with whole seedlings. However, root tips appeared to be more sensitive than the whole seedlings. Injury at the tissue and cell levels of the 2-mm root tips that were treated with various concentrations of cycloxydim was examined after 24 hours incubation. Concentrations of 0.1, 1, and 10 μM cycloxydim caused severe cell vacuolization. A gradient of decreasing injury from epidermal cells toward the center of roots was observed. This pattern of injury appeared to reflect the penetration of cycloxydim into roots along a concentration gradient.en
dc.description.degreePh. D.en
dc.format.extentxiii, 122 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10192005-113329en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10192005-113329/en
dc.identifier.urihttp://hdl.handle.net/10919/39985en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1990.L51.pdfen
dc.relation.isformatofOCLC# 23716350en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1990.L51en
dc.subject.lcshHerbicide resistanceen
dc.subject.lcshHerbicides -- Researchen
dc.titleMechanisms of action and selectivity of the cyclohexen-one herbicide cycloxydim (BAS 517)en
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplinePlant Physiology and Weed Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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