Non-Mendelian transmission of apomixis in maize - Tripsacum hybrids caused by a transmission ratio distortion

Article Abstract:

Non-Mendelian transmission of apomixis, an asexual type of reproduction, in maize, or corn, is discussed with the information that Tripsacum hybrids are the result of a transmission ratio distortion. Various generations of maize-Tripsacum hybrids and backcross derivatives were analyzed for the phenotypical expression of the apomictic mode of reproduction and for the transmission of the chromosomal segment carrying the apomictic gene(s), as revealed by specific molecular markers. It appears from the study that a gene or genes controlling apomixis is not inherited through haploid gametes.

Heredity, Hybridization, Reproduction, Asexual, Asexual reproduction

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Mapping diplosporous apomixis in tetraploid Tripsacum: one gene or several genes?

Article Abstract:

Whether one gene or several genes are involved in mapping diplosporous apomixis, an asexual type of reproduction, in tetraploid Tripsacum, a wild relative of maize, is discussed as are implications for transfer of apomixis into cultivated crops. Diplosporous apomixis is related to the failure of meiosis and the parthenogenetic development of the unreduced gametes, so the offspring are exactly like the mother plant genetically. A new approach for studying genetics of apomixis is proposed and is based on comparative mapping.

Methods, Chromosome mapping

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Reproductive behavior in maize-Tripsacum polyhaploid plants: implications for the transfer of apomixis into maize

Article Abstract:

Diploid crops, such as maize, appear to reproduce apomictically. Apomictic reproduction in polyhalpoids that exhibit a chromosomal complement resembling a diploid indicates that diplosporous apomixis and polyploid are unlinked. The process of transfer of apomixis from diplosporous tetraploid Tripsacum into maize via backcrosses produces polyhaploid plants. The plants have one set of chromosomes from each genus, and are completely male sterile. Viable seeds are, however, formed apomictically during pollination with maize.

Polyploidy

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