| Abstract Detail
Breeding and Genetics Clausen, Andrea M. [1], Ispizúa, Verónica N. [1], Camadro, Elsa L. [2], Larrosa, Federico [1]. Morphological and genetic variability in wild potato species from Northwest Argentina. WILD potato species identified as S. infundibuliforme (ifd) and S. gourlayi (grl) and probably interspecific hybrids (grl-ifd; opl-ifd) were collected in a narrow gorge known as Incacuevas in Jujuy province, Argentina. Eleven populations from this area and two accessions, respectively, of S. oplocense (opl) and grl from neighboring valleys were studied analyzing 36 morphological characters in 172 genotypes, pollen fertility and 2n pollen in 76 genotypes. Chromosome numbers were determined on a variable number of genotypes. Diallel crosses were performed among selected genotypes. The morphological characters analyzed by means of ACP revealed a considerably variability, in several populations. Ifd, opl and grl like types were identified in the hybrid populations, that clustered close to the true species. The crossing results reveal the presence of genetic barriers between opl and ifd. Pollen fertility and 2n pollen production ranged, respectively from 91-57 and 6,3-4,1% in populations that may contain putative hybrids. Chromosome counts of the putative hybrids revealed that they are tetraploid, presenting some of them a strong resemblance to opl and others to grl. The variability registered in these populations in their natural habitat is the result of gene flow probably by sexual polyploidization and the establishment of hybrid populations with varying degrees of male fertility. Another likely hypothesis is that tetraploid opl grows in this area and this will be elucidated by additional sampling and DNA analysis.
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1 - Unidad integrada EEA Balcarce, INTA - FCA - UNMdP, agronomía, c. c. 276, Balcarce, Buenos Aires, 7620, Argentina
2 - Unidad integrada EEA Balcarce, INTA - FCA - UNMdP, CONICET, agronomía, c. c. 276, Balcarce, Buenos Aires, 7620, Argetnina
Keywords:
wild potato species
sexual polyploidization.
Session: Poster-29
Location: Ballroom CD/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 8:00 AM
Abstract ID:108 |
