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TitleDisomic Inheritance, Suppressed Recombination, and Allelic Interactions Govern Apospory in Buffelgrass as Revealed by Genome Mapping
AuthorsR. W. Jessup, B. L. Burson, G. B. Burow, Y.-W. Wang, C. Chang, Z. Li, A. H. Paterson, and M. A. Hussey
PublicationCrop Sci 42(5): 1688-1694
AbstractMolecular tools have not identified the gene(s) governing apomixis nor have they been used to successfully transfer the trait to important, sexually reproducing food crops. Several molecular studies addressing apomixis in grasses have used interspecific and intergeneric hybrids. The failure to recover specific F1 genotypes from these wide crosses can be caused by unfavorable interactions between the gametes, zygote, embryo, endosperm, and/ or maternal tissue. These interactions can eliminate recombinant genotypes with valuable information towards linkage analyses of the trait. Buffelgrass [Pennisetum ciliare (L.) Link syn. Cenchrus ciliaris L.], a polymorphic species with intermaize fertile apomictic and sexual genotypes, offers an opportunity to genetically map apomixis by means of intraspecific hybrids with euploid genomes. This study reports a linkage map of the apospory region in buffelgrass. Apospory, classified by progeny testing and cytologically observing megagametophytes, mapped to a single locus in the apomictic parent

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