US4051629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid seed production
Assignee: Research Corp
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Filing: 1976-04-12
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Granted: 1977-10-04
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Expires: 1996-04-12
Abstract
Abstract The use of alien chromosomes from Tripsacum to mask the expression of undesirable recessive traits in the production of hybrid corn seed is disclosed. When an alien addition monosome is used as a parent in a hybrid cross, the low transmission rate of the alien chromosome results in the expression of desirable traits in the progeny which were masked with the undesirable traits.
Inventors
- 👤 Walton C. Galinat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:19
CPC Classifications
A; A01; A01H; A01H1/00; A01H1/02; Y; Y10; Y10S; Y10S47/00; Y10S47/01
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
85 words
A method for masking the expression of an undesirable recessive trait in the production of hybrid corn comprising the steps of: selecting a corn which is homozygous for said trait; incorporating into said corn a Tripsacum chromosome which has the dominant allele for said trait and which also has the capability of genetically interacting with said corn to produce, upon selfing, an endosperm phenotype sufficiently recognizable to determine whether said endosperm carries said chromosome; and selfing said corn to increase said endosperm carrying said chromosome.
Claim 2
Independent Claim
85 words
A method for masking the expression of an undesirable recessive trait in the production of hybrid corn comprising the steps of: selecting a corn which is homozygous for said trait; incorporating into said corn a Tripsacum chromosome which has the dominant allele for said trait and which also has the capability of genetically interacting with said corn to produce, upon selfing, an endosperm phenotype sufficiently recognizable to determine whether said endosperm carries said chromosome; and selfing said corn to increase said endosperm carrying said chromosome.
Claim 3
Independent Claim
107 words
A method for producing hybrid corn seed comprising the steps of: selecting a first corn having a homozygous recessive gene system which results in the expression of a desirable trait and an undesirable trait; incorporating into said first corn a Tripsacum chromosome having the capability of masking said undesirable trait; crossing said first corn as either parent with a second corn having a gene system capable of interacting with the gene system of said first corn to produce corn seed which does not carry said chromosome and which either has said desirable trait or will produce some offspring having said desirable trait; and harvesting said corn seed.
Claim 4
Independent Claim
107 words
A method for producing hybrid corn seed comprising the steps of: selecting a first corn having a homozygous recessive gene system which results in the expression of a desirable trait and an undesirable trait; incorporating into said first corn a Tripsacum chromosome having the capability of masking said undesirable trait; crossing said first corn as either parent with a second corn having a gene system capable of interacting with the gene system of said first corn to produce corn seed which does not carry said chromosome and which either has said desirable trait or will produce some offspring having said desirable trait; and harvesting said corn seed.
Claim 5
Independent Claim
98 words
A method for producing hybrid corn seed comprising the steps of: selecting a first corn having a homozygous recessive gene system which results in the expression of a desirable trait and an undesirable trait; obtaining an alien addition monosomic version of said first corn containing a Tripsacum chromosome capable of inhibiting the expression of said undesirable trait; crossing said alien addition monosomic version as either parent with a second corn to produce corn seed at least a portion of which does not carry said chromosome and either has or will produce some offspring which have said desirable trait.
Claim 6
Independent Claim
98 words
A method for producing hybrid corn seed comprising the steps of: selecting a first corn having a homozygous recessive gene system which results in the expression of a desirable trait and an undesirable trait; obtaining an alien addition monosomic version of said first corn containing a Tripsacum chromosome capable of inhibiting the expression of said undesirable trait; crossing said alien addition monosomic version as either parent with a second corn to produce corn seed at least a portion of which does not carry said chromosome and either has or will produce some offspring which have said desirable trait.
Claim 7
Dependent Claim
38 words
The method of claim 3 wherein said alien addition monosomic version is obtained by line crossing an alien addition disomic version of said corn having a pair of said Tripsacum chromosomes with said first corn as either parent.
Claim 8
Dependent Claim
35 words
The method of claim 3 including the further step of maintaining the alien addition monosomic version by selfing and selecting from the progeny for further use the endosperm which reflects transmission of said Tripsacum chromosome.
Claim 9
Independent Claim
74 words
A method for producing hybrid sweet corn seed comprising the steps of: selecting a first corn which is homozygous for the recessive combination sugary-shrunken 2 (genotype su sh2); incorporating into said corn the seventh chromosome of Tripsacum to obtain an alien addition monosome corn (genotype su sh2: Tr7(1)); crossing said alien addition monosome corn as either parent with a sweet corn (genotype su Sh2) to obtain hybrid sweet corn seed; and harvesting said seed.
Claim 10
Independent Claim
74 words
A method for producing hybrid sweet corn seed comprising the steps of: selecting a first corn which is homozygous for the recessive combination sugary-shrunken 2 (genotype su sh2); incorporating into said corn the seventh chromosome of Tripsacum to obtain an alien addition monosome corn (genotype su sh2: Tr7(1)); crossing said alien addition monosome corn as either parent with a sweet corn (genotype su Sh2) to obtain hybrid sweet corn seed; and harvesting said seed.
Claim 11
Dependent Claim
29 words
The method of claim 6 including the further step of removing from the harvested seed that proportion of the endosperm which reflects transmission of the seventh chromosome of Tripsacum.
Claim 12
Dependent Claim
37 words
The method of claim 6 including the further step of maintaining the alien addition monosome corn by selfing and selecting from the progeny for further use the endosperm which reflects transmission of the seventh chromosome of Tripsacum.
Claim 13
Dependent Claim
36 words
The method of claim 6 wherein said alien addition monosome corn is obtained by line crossing an alien addition disome corn of genotype su sh2: Tr7(2) as either parent with said first corn (genotype su sh2).
Claim 14
Dependent Claim
21 words
The method of claim 9 wherein said alien addition disome corn is employed as the female parent in said line cross.
Claim 15
Dependent Claim
24 words
The method of claim 6 wherein said alien addition monosome corn is employed as the male parent in the cross with said sweet corn.
Claim 16
Independent Claim
66 words
A method for producing hybrid sweet corn seed comprising the steps of: selecting a first corn which is homozygous for the recessive combination su shl wx c; incorporating into said corn the fifth chromosome of Tripsacum to obtain an alien addition monosomic version thereof; crossing said alien addition monosomic version with a sweet corn of genotype su Shl Wx C; and harvesting the progeny as seed.
Claim 17
Independent Claim
66 words
A method for producing hybrid sweet corn seed comprising the steps of: selecting a first corn which is homozygous for the recessive combination su shl wx c; incorporating into said corn the fifth chromosome of Tripsacum to obtain an alien addition monosomic version thereof; crossing said alien addition monosomic version with a sweet corn of genotype su Shl Wx C; and harvesting the progeny as seed.
Claim 18
Dependent Claim
30 words
The method of claim 12 including the further step of removing from the harvested progeny those seeds which exhibit, by aleurone color, the presence of said fifth chromosome of Tripsacum.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |