Methods for producing apomictic plants
AssigneeUtah State University
InventorJohn G. Carman
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Abstract
Methods are provided for producing apomictic plants from sexual plants divergent with respect to responses to different photoperiods and schedules of megaspore and gametophyte development. A preferred system is to identify divergent lines from within a species or closely related group of species, accentuate the divergence by breeding where necessary, and produce artificial amphiploids that contain genomes from the apposing divergent lines. Apomixis results from the asynchronous expression of female developmental programs induced by combining the reproductively divergent lines. The procedures for manipulating the expression of apomixis described herein permit the development of true-breeding hybrids of various cultivated crops.
Claims26
A method of producing an apomictic plant from sexual plants, the method comprising the steps of:
- (a) selecting a first and second sexual plant from an angiospermous plant species, genus, or family, wherein the initiation time of embryo sac formation in the first plant occurs at about the same time as or before megasporogenesis in the second plant relative to the developmental maturity of the nongametophytic ovule and ovary tissues;
- (b) hybridizing the first plant and second plant;
- (c) recovering seed therefrom;
- (d) sowing the seed, and (e) selecting a hybrid plant that is apomictic.
A method of producing an apomictic plant from sexual plants, the method comprising the steps of:
- (a) screening plants within an angiospermous plant species, genus, or family for differences in the timing of initiation of megasporogenesis and embryo sac formation relative to the developmental maturity of nongametophytic ovule and ovary tissues among the plants;
- (b) selecting a first plant and a second plant, wherein the initiation time of embryo sac formation in the first plant occurs at about the same time as or before megasporogenesis in the second plant relative to the developmental maturity of nongametophytic ovule and ovary tissues;
- (c) hybridizing the first and second plants;
- (d) recovering seed therefrom;
- (e) sowing the seed, and
- (f) selecting a hybrid plant that is apomictic.
Dependencies are inferred from the claim text.