Type of Document	Dissertation
Author	Kim, Sangho
URN	etd-10262005-100957
Title	Metabolic bases for the differential response of 'Kwangkyo' and 'Hood' soybean (Glycine max (L.) Merr) to the herbicide paraquat
Degree	PhD
Department	Plant Physiology and Weed Science
Advisory Committee	Advisor Name Title Hatzios, Kriton K. Committee Chair Cramer, Carole L. Committee Member Hess, John L. Committee Member Orcutt, David M. Committee Member Parrish, David J. Committee Member
Keywords	Paraquat Physiological effect. Soybean Physiology.
Date of Defense	1992-10-05
Availability	restricted
Abstract The 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.
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