Metabolic bases for the differential response of 'Kwangkyo' and 'Hood' soybean (Glycine max (L.) Merr) to the herbicide paraquat

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dc.contributor.authorKim, Sanghoen
dc.contributor.committeechairHatzios, Kriton K.en
dc.contributor.committeememberCramer, Carole L.en
dc.contributor.committeememberHess, John L.en
dc.contributor.committeememberOrcutt, David M.en
dc.contributor.committeememberParrish, David J.en
dc.contributor.departmentPlant Physiology and Weed Scienceen
dc.date.accessioned2014-03-14T21:22:16Zen
dc.date.adate2005-10-26en
dc.date.available2014-03-14T21:22:16Zen
dc.date.issued1992-10-05en
dc.date.rdate2005-10-26en
dc.date.sdate2005-10-26en
dc.description.abstractThe soybean cultivars differentially sensitive to 'Kwangkyo' and 'Hood' are the bipyridylium herbicide paraquat (1,l'-dimethyl-4,4'-bipyridinium ion). This was confirmed by visible injury observations as well as by measurements of desiccation ratings, chlorophyll content, and chlorophyll fluorescence tracings of fully expanded first trifoliolate leaves of these two cultivars after exposure to a wide range of paraquat concentrations. The margin of this intraspecific differential tolerance to paraquat was narrow and the ratio of the paraquat concentrations causing 50% injury to the tolerant Kwangkyo and to the susceptible Hood (approximate tolerance factor) was found to be 10. Paraquat at 1 μM or higher inhibited rapidly the CO₂ fixation capacity of leaf mesophyll cells, isolated enzymatically from both cultivars. This result shows that the differential response does not result from any differences at the site of paraquat action in chloroplast membranes.en
dc.description.degreePh. D.en
dc.format.extentxiii, 184 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10262005-100957en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10262005-100957/en
dc.identifier.urihttp://hdl.handle.net/10919/40182en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1992.K5593.pdfen
dc.relation.isformatofOCLC# 27696922en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1992.K5593en
dc.subject.lcshParaquat -- Physiological effecten
dc.subject.lcshSoybean -- Physiologyen
dc.titleMetabolic bases for the differential response of 'Kwangkyo' and 'Hood' soybean (Glycine max (L.) Merr) to the herbicide paraquaten
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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