INVESTIGADORES
SEIJO Jose Guillermo
artículos
Título:
DNA content in South American endemic species of Lathyrus
Autor/es:
CHALUP, L.; GRABIELE M.; SOLÍS NEFFA, V.G.; SEIJO, J.G
Revista:
JOURNAL OF PLANT RESEARCH
Editorial:
SPRINGER TOKYO
Referencias:
Lugar: Tokyo; Año: 2014 p. 1 - 12
ISSN:
0918-9440
Resumen:
The genome size was surveyed in 13 Notolathyrus
species endemic to South America by flow cytometry
and analyzed in an evolutionary and biogeographic
context. A DNA content variation of 1.7-fold was registered,
and four groups of species with different DNA
content were determined. Although, the 2C values were
correlated with the total chromosome length and intrachromosomal
asymmetry index (A1), the karyotype formula
remained almost constant. The conservation of the
karyotype formula is in agreement with proportional
changes of DNA in the chromosome arms. Species with
annual life cycle and shorter generation time had the lowest
DNA content and the data suggest that changes in DNA
content involved reductions of genome size in the perennial
to annual transitions. The variation of 2C values was correlated
with precipitation of the coldest quarter and, to
some extent, with altitude. Additional correlations with
other variables were observed when the species were
analyzed separately according to the biogeographic
regions. In general, the species with higher DNA content
were found in more stable environments. The bulk of
evidence suggests that changes on genome size would have
been one of the most important mechanisms that drove or
accompanied the diversification of Notolathyrus species.