Semi-dwarf maize and method
First Claim
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1. 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.
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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.
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Citations
7 Claims
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1. A method of obtaining seeds of dominant semi-dwarf maize, including the steps of:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A method of converting a normal inbred line of maize plants to a semi-dwarf line including the steps of:
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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. - View Dependent Claims (7)
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Specification