INVESTIGADORES
SEIJO Jose Guillermo
artículos
Título:
Genetic and geographic origin of domesticated peanut as evidenced by 5S rDNA and chloroplast DNA sequences.
Autor/es:
GRABIELE MARINA; CHALUP, L.; ROBLEDO, G; J. G. SEIJO
Revista:
PLANT SYSTEMATICS AND EVOLUTION
Editorial:
SPRINGER WIEN
Referencias:
Lugar: Viena; Año: 2012 vol. 298 p. 1151 - 1165
ISSN:
0378-2697
Resumen:
The history of the cultivated peanut involves
natural evolution and human domestication. Despite the
economic importance of peanuts and the many studies
carried out on their cytology and genetic variability, current
knowledge on the origin of the cultigen is still very
limited compared with other major crops. In this context,
we analyzed the polymorphisms of some non-coding
cpDNA regions and the non-transcribed spacer of the
nuclear 5S rDNA of the six botanical varieties of the two
subspecies of the cultigen, of the wild tetraploid A. monticola,
and of the nine diploid species so far proposed as the
most probable relatives of the peanut, to gain more insight
into the genetic and geographic origin of this legume crop.
The analysis showed complete homology in the sequences
of all the peanut and A. monticola samples. These results
strongly suggest that the six botanical varieties of the
cultigen have a single genetic origin and that A. monticola
should be regarded as the immediate tetraploid ancestor
from which A. hypogaea has arisen upon domestication.
Here we provide results from the first sequence-based
analysis in which the maternal (A. duranensis) and paternal
(A. ipae¨nsis) wild diploid species of the AABB tetraploids
of Arachis were unequivocally identified. Not only that, but
the combination of cpDNA and NTS 5S rDNA identified
the population of A. duranensis from Rý´o Seco, Salta,
Argentina, and the only known population of A. ipae¨nsis
from Villa Montes, Tarija, Bolivia, as those to which the
genome donors of the peanut could have belonged.