Herbicide resistant tobacco
AssigneeE. I. Du Pont de Nemours and Company
InventorsRoy S. Chaleff, Thomas B. Ray
Life of this patent
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Abstract
Tobacco varieties exhibiting agronomically useful resistance to N-(heterocyclicaminocarbonyl)arylsulfonamide herbicides are produced by tissue culture selection techniques.
Claims12
A process for producing mutant Nicotiana tabacum plants having stable, heritable resistance to herbicidally-effective N-(heterocyclicaminocarbonyl) arylsulfonamide compounds, comprising:
- (a) propagating cell cultures of Nicotiana tabacum under plant cell culture conditions;
- (b) exposing the cell cultures to a selective medium comprising a herbicidally-effective N-(heterocyclicacaminocarbonyl) arylsulfonamide compound present at a concentration inhibitory or lethal to normal cells;
- (c) isolating mutant cell lines capable of sustained growth in the selective medium;
- and
- (d) regenerating from the mutant cell lines reproductively competent plants that express resistance to said N-(heterocyclicacaminocarbonyl) arylsulfonamide compounds.
A first generation hybrid tobacco plant having resistance to a herbicidally-effective N-(heterocyclicaminocarbonyl)arylsulfonamide compound, the hybrid tobacco plant having been grown from seed from cross-pollination of parent plants, wherein at least one parent plant has gametes with nuclei which carry at least one dominant or semidominant gene conferring resistance to a herbicidally-effective sulfonamide compound.
A method of growing tobacco, comprising cultivating tobacco plants having genetic resistance to a herbicidally-effective N-(heterocyclicaminocarbonyl)arylsulfonamide compound, in the presence of a concentration of a herbicidal compound to which the tobacco plants are resistant, which concentration is sufficient to inhibit growth of substantially all undesired plants, but permit growth of the tobacco plants having genetic resistance.
A method of growing tobacco, comprising cultivating tobacco plants having genetic resistance to a hericidally-effective N-(heterocyclicaminocarbonyl)arylsulfonamide compound, and applying post-emergence a concentration of a herbicidal compound to which the tobacco plants are resistance, which concentration is sufficient to inhibit growth of substantially all undesired plants, but permit continued growth of the tobacco plants having genetic resistance.
Dependencies are inferred from the claim text.