Apomictic maize
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsBryan K. Kindiger, Victor Sokolov
Life of this patent
Estimating the term…
Abstract
Apomictic maize/Tripsacum hybrids having a ratio of maize chromosomes: Tripsacum chromosomes of at least 30:9 have been developed. These hybrids are useful for introgressing diplosporous apomictic reproduction into a maize background toward the ultimate goal of establishing immortalized commercial lines of apomictic maize having stably inherited characteristics without the need for continuously producing hybrid seed by repeated crossings of selected parental lines. DNA primers for use in assaying maize/Tripsacum hybrids for apomictic reproduction behavior are provided.
Claims28
Apomictic maize having at least one dominant gene N for controlling nonreduction of the egg and at least one dominant gene A for controlling apomictic development of the egg.
An apomictic maize/Tripsacum hybrid having a karyotype wherein the ratio of maize chromosomes:
- Tripsacum chromosomes is at least 30:9, and wherein said hybrid has at least one dominant gene N for controlling nonreduction of the egg and at least one dominant gene A for controlling apomictic development of the egg.
A method of increasing the complement of maize chromosomes in a maize/Tripsacum hybrid comprising backcrossing the hybrid with a sexually reproducing maize line and selecting for a B.sub.III -derived hybrid, wherein said maize/Tripsacum hybrid has a ratio of maize chromosomes:
- Tripsacum chromosomes of at least 30:9.
A method of increasing the complement of maize chromosomes in a maize/Tripsacum hybrid comprising backcrossing the hybrid with a sexually reproducing maize line, selecting for an individual having a Mz6-Tr16 translocation, backcrossing that individual with a sexually reproducing maize line and selecting for a B.sub.III -derived hybrid.
A method of introgressing apomixis into a maize that reproduces sexually comprising transferring into said maize both the dominant allele N responsible for non-reduction and the dominant allele A responsible for apomictic development of an unreduced egg.
An isolated region of the long arm of Tripsacum dactyloides chromosome 14 comprising the dominant allele N responsible for non-reduction and the dominant allele A responsible for apomictic development of an unreduced egg.
Dependencies are inferred from the claim text.