INVESTIGADORES
MARTINEZ eric Javier
artículos
Título:
Comparative mapping reveals partial conservation of synteny at the apomixis locus in Paspalum spp.
Autor/es:
PUPILLI, FULVIO; MARTÍNEZ, ERIC J.; CALDERINI, ORNELLA; BUSTI, ALEXANDRA; QUARIN, CAMILO L.; ARCIONI, SERGIO
Revista:
MOLECULAR GENETICS AND GENOMICS
Editorial:
Springer Berlin / Heidelberg
Referencias:
Año: 2004 vol. 270 p. 539 - 548
ISSN:
1617-4615
Resumen:
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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.
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
