Virginia Tech
Metabolic bases for the differential response of 'Kwangkyo' and 'Hood' soybean (Glycine max (L.) Merr) to the herbicide paraquat
Abstract
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.
Degree
thesis:*- Name thesis:degree_name
- Ph. D.
- Level thesis:degree_level
- doctoral
- Discipline thesis:degree_discipline
- Plant Physiology and Weed Science
- Department dc:contributor.department
- Plant Physiology and Weed Science
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1992
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Kim, Sangho
- Chair dc:contributor.committeechair
-
- Hatzios, Kriton K.
- Committee members dc:contributor.committeemember
-
- Cramer, Carole L.
- Hess, John L.
- Orcutt, David M.
- Parrish, David J.
Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-10262005-100957
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/40182