Comparative mapping reveals partial conservation of synteny at the apomixis locus in Paspalum spp

In plants, gametophytic apomixis is a form of asexual reproduction that leads to the formation of seed-derived offspring that are genetically identical to the mother plant. A common set of RFLP markers, including five rice anchor markers previously shown to be linked to apomixis in Paspalum simplex,...

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Published in:Molecular genetics and genomics : MGG 2004, Vol.270 (6), p.539-548
Main Authors: Pupilli, F, Martinez, E.J, Busti, A, Calderini, O, Quarin, C.L, Arcioni, S
Format: Article
Language:English
Subjects:
apomixis
chromosome mapping
Chromosome Mapping - methods
Chromosomes
Conserved Sequence
DNA, Plant - genetics
Gene loci
Genes, Plant
Genetic Markers
Genome, Plant
loci
Oryza - genetics
Oryza sativa
Paspalum - classification
Paspalum - genetics
Paspalum malacophyllum
Paspalum notatum
Paspalum simplex
restriction fragment length polymorphism
rice
Seeds - genetics
Species Specificity
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Summary:In plants, gametophytic apomixis is a form of asexual reproduction that leads to the formation of seed-derived offspring that are genetically identical to the mother plant. A common set of RFLP markers, including five rice anchor markers previously shown to be linked to apomixis in Paspalum simplex, were used to detect linkage with apomixis in P. notatum and P. malacophyllum. A comparative map of the region around the apomixis locus was constructed for the three Paspalum species, and compared to the rice map. The locus that controls apomixis in P. simplex was almost completely conserved in the closely related species P. malacophyllum, whereas it was only partially represented in the distantly related species P. notatum. Although strong synteny of markers was noted between this locus and a portion of rice chromosome 12 in both P. simplex and P. malacophyllum, the same locus in P. notatum was localized to a hybrid chromosome which carries markers that map to rice chromosomes 2 and 12. All three Paspalum species showed recombination suppression at the apomixis locus; in the case of P. notatum, this might be due to a heterozygosity for a translocation that most probably negatively interferes with chromosomal pairing near the locus. A common set of markers that show linkage with apomixis in all three Paspalum species define a portion of the apomixis-controlling locus that is likely to contain genes critical for apomictic reproduction.
ISSN:1617-4615
1617-4623
DOI:10.1007/s00438-003-0949-5