US4368592A
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Semi-dwarf maize and method
Assignee: DeKalb Genetics Corp
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Filing: 1981-07-27
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Granted: 1983-01-18
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Expires: 2001-07-27
Abstract
Abstract Methods for use of genic dominant semi-dwarfism in the production of commercial hybrid maize including producing and maintaining seed stocks substantially of a homozygous semi-dwarf genotype and stocks substantially of a heterozygous, semi-dwarf allele and a non-semi-dwarf allele, genotype, which provide a semi-dwarf phenotype.
Inventors
- 👤 Vern A. Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:32
CPC Classifications
A; A01; A01H; A01H6/00; A01H6/46; A01H6/4684; Y; Y10; Y10S; Y10S47/00; Y10S47/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
209 words
A method of obtaining seeds of dominant semi-dwarf maize, including the steps of: growing a first generation maize plant from first generation seed which includes a dominant semi-dwarf height allele; self-pollinating the first generation maize plant to produce second generation seed; growing a second generation of maize plants from the second generation seed; eliminating the normal height maize plants, if any, from the second generation plants; self-pollinating the remaining second generation plants to produce third generation seed; isolating the third generation seed from each plant as a set from the seed of the remaining second generation plants; growing third generation plants on a segregated basis from seed from each set of isolated third generation seed; self-pollinating the third generation plants in the isolated sets which are of semi-dwarf height to produce fourth generation seeds; collecting the fourth generation seed from the sets of isolated seed whose segregated third generation sample plants are all of semi-dwarf height; and thereafter cyclically growing additional generation of plants from the thus collected fourth generation seed, self-pollinating such plants to produce additional seed from which additional plant generations are grown and self-pollinated to produce additional seed, etc. on a cyclical basis a sufficient number of times to produce final semi-dwarf seed of satisfactory homozygosity.
Claim 2
Independent Claim
209 words
A method of obtaining seeds of dominant semi-dwarf maize, including the steps of: growing a first generation maize plant from first generation seed which includes a dominant semi-dwarf height allele; self-pollinating the first generation maize plant to produce second generation seed; growing a second generation of maize plants from the second generation seed; eliminating the normal height maize plants, if any, from the second generation plants; self-pollinating the remaining second generation plants to produce third generation seed; isolating the third generation seed from each plant as a set from the seed of the remaining second generation plants; growing third generation plants on a segregated basis from seed from each set of isolated third generation seed; self-pollinating the third generation plants in the isolated sets which are of semi-dwarf height to produce fourth generation seeds; collecting the fourth generation seed from the sets of isolated seed whose segregated third generation sample plants are all of semi-dwarf height; and thereafter cyclically growing additional generation of plants from the thus collected fourth generation seed, self-pollinating such plants to produce additional seed from which additional plant generations are grown and self-pollinated to produce additional seed, etc. on a cyclical basis a sufficient number of times to produce final semi-dwarf seed of satisfactory homozygosity.
Claim 3
Dependent Claim
31 words
The method of claim 1 further characterized by and including the step of eliminating all of the third generation sources in the isolated sets which have any normal height plants therein.
Claim 4
Dependent Claim
169 words
The method of claim 1 further characterized by and including the steps of also self-pollinating the third generation plants of semi-dwarf height in the isolated sets which have both semi-dwarf and normal height plants therein to produce separate fourth generation seeds; growing separate fourth generation plants from such fourth generation seed; self-pollinating such fourth generation plants to produce fifth generation seed; isolating the fifth generation seeds from each plant as a set from the fourth generation plants; growing fifth generation plants on a segregated basis from a representative sample of seed from each set of isolated fifth generation seed; collecting the fifth generation seed whose fifth generation sample plants are all of semi-dwarf height; and thereafter cyclically growing additional generations of plants from the thus collected fifth generation seed, self-pollinating such plants to produce additional seed from which additional plant generations are grown to be self-pollinated to produce additional seed, etc. all on a cyclical basis a sufficient number of times to produce final semi-dwarf seed of satisfactory homozygosity.
Claim 5
Dependent Claim
51 words
The method of claim 1 further characterized by and including the step of using seed from the source identified as DEKALB Semi-Dwarf Corn Ser. No. 90494, Laboratory No. 2M-2447, U.S. Department of Agriculture, Agricultural Research Service, Western Region, Colorado State University, Fort Collins, Colo., 80523 as the first generation semi-dwarf seed.
Claim 6
Dependent Claim
34 words
The method of claim 1 in which the first generation seed is homozygous as to the dominant semi-dwarf height allele, and no normal height maize plants are produced in the second generation maize plants.
Claim 7
Independent Claim
259 words
A method of converting a normal inbred line of maize plants to a semi-dwarf line including the steps of: growing a first generation maize plant from first generation seed which includes a dominant semi-dwarf height allele, growing a first generation of maize plants from seed of a normal inbred line; causing pollination of one such first generation plant with the other to produce second generation seed; growing a second generation of maize plant from the second generation seed; crossing the second generation of maize plants with the first generation normal inbred line maize plants to produce third generation seed; growing third generation maize plants from the third generation seeds; eliminating the normal height maize plants from the third generation plants; self-pollinating the remaining third generation plants to produce fourth generation seeds; isolating the fourth generation seeds from each plant as a set from the remaining third generation plants; growing fourth generation plants on a segregated basis from seed from each set of isolated fourth generation seed; self-pollinating the fourth generation plants in the isolated sets which are of semi-dwarf height to produce fifth generation seeds; collecting the fifth generation seed from the sets of isolated seed whose segregated fourth generation plants are all of semi-dwarf height; and thereafter cyclically growing additional generation of plants from the thus collected fifth generation seed, self-pollinating such plants to produce additional seed from which additional plant generations are grown and self-pollinated to produce additional seed, etc. on a cyclical basis a sufficient number of times to produce final semi-dwarf seed of satisfactory homozygosity.
Claim 8
Independent Claim
259 words
A method of converting a normal inbred line of maize plants to a semi-dwarf line including the steps of: growing a first generation maize plant from first generation seed which includes a dominant semi-dwarf height allele, growing a first generation of maize plants from seed of a normal inbred line; causing pollination of one such first generation plant with the other to produce second generation seed; growing a second generation of maize plant from the second generation seed; crossing the second generation of maize plants with the first generation normal inbred line maize plants to produce third generation seed; growing third generation maize plants from the third generation seeds; eliminating the normal height maize plants from the third generation plants; self-pollinating the remaining third generation plants to produce fourth generation seeds; isolating the fourth generation seeds from each plant as a set from the remaining third generation plants; growing fourth generation plants on a segregated basis from seed from each set of isolated fourth generation seed; self-pollinating the fourth generation plants in the isolated sets which are of semi-dwarf height to produce fifth generation seeds; collecting the fifth generation seed from the sets of isolated seed whose segregated fourth generation plants are all of semi-dwarf height; and thereafter cyclically growing additional generation of plants from the thus collected fifth generation seed, self-pollinating such plants to produce additional seed from which additional plant generations are grown and self-pollinated to produce additional seed, etc. on a cyclical basis a sufficient number of times to produce final semi-dwarf seed of satisfactory homozygosity.
Claim 9
Dependent Claim
51 words
The method of claim 6 further characterized by and including the step of using seed from the source identified as DEKALB Semi-Dwarf Corn Ser. No. 90494, Laboratory No. 2M-2447, U.S. Department of Agriculture, Agricultural Research Service, Western Region, Colorado State University, Fort Collins, Colo., 80523 as the first generation semi-dwarf seed.
References Cited (Backward Citations)
US3710511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |