Title page for ETD etd-10262005-100957
|Type of Document
||Metabolic bases for the differential response of 'Kwangkyo' and 'Hood' soybean (Glycine max (L.) Merr) to the herbicide paraquat
||Plant Physiology and Weed Science
|Hatzios, Kriton K.
|Cramer, Carole L.
|Hess, John L.
|Orcutt, David M.
|Parrish, David J.
- Paraquat Physiological effect.
- Soybean Physiology.
|Date of Defense
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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