Antonio Krapovickas
Instituto de Botánica del Nordeste
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Featured researches published by Antonio Krapovickas.
American Journal of Botany | 2004
J. Guillermo Seijo; Graciela I. Lavia; Aveliano Fernández; Antonio Krapovickas; Daniel A. Ducasse; Eduardo A. Moscone
The 5S and the 18S-25S rRNA genes were physically mapped by fluorescent in situ hybridization (FISH) in all botanical varieties of cultivated peanut Arachis hypogaea (2n = 4x = 40), in the wild tetraploid A. monticola, and in seven wild diploid species considered as putative ancestors of the tetraploids. A detailed karyotype analysis including the FISH signals and the heterochromatic bands was carried out. Molecular cytogenetic landmarks are provided for the construction of a FISH-based karyotype in Arachis species. The size, number, and chromosome position of FISH signals and heterochromatic bands are similar in all A. hypogaea varieties and A. monticola, but vary among the diploid species. Genome constitution of the species is discussed and several chromosome homeologies are established. The bulk of the chromosome markers mapped, together with data on geographical distribution of the taxa, suggest that peanut originated upon domestication of A. monticola and evidence that the diploids A. duranensis and A. ipaensis are the most probable ancestors of both tetraploid species. Allopolyploidy could have arisen by a single event or, if by multiple events, always from the same diploid species.
American Journal of Botany | 2007
Guillermo Seijo; Graciela I. Lavia; Aveliano Fernández; Antonio Krapovickas; Daniel A. Ducasse; David J. Bertioli; Eduardo A. Moscone
Arachis hypogaea is a natural, well-established allotetraploid (AABB) with 2n = 40. However, researchers disagree on the diploid genome donor species and on whether peanut originated by a single or multiple events of polyploidization. Here we provide evidence on the genetic origin of peanut and on the involved wild relatives using double GISH (genomic in situ hybridization). Seven wild diploid species (2n = 20), harboring either the A or B genome, were tested. Of all genomic DNA probe combinations assayed, A. duranensis (A genome) and A. ipaensis (B genome) appeared to be the best candidates for the genome donors because they yielded the most intense and uniform hybridization pattern when tested against the corresponding chromosome subsets of A. hypogaea. A similar GISH pattern was observed for all varieties of the cultigen and also for A. monticola. These results suggest that all presently known subspecies and varieties of A. hypogaea have arisen from a unique allotetraploid plant population, or alternatively, from different allotetraploid populations that originated from the same two diploid species. Furthermore, the bulk of the data demonstrated a close genomic relationship between both tetraploids and strongly supports the hypothesis that A. monticola is the immediate wild antecessor of A. hypogaea.
Bonplandia | 2010
Antonio Krapovickas; Walton C. Gregory
Bonplandia (suppl.) | 2007
Antonio Krapovickas; Walton C. Gregory
Bonplandia | 2008
Antonio Krapovickas; Guillermo Seijo
Bonplandia | 2007
Antonio Krapovickas; Walton C. Gregory
Bonplandia | 2009
Antonio Krapovickas; Ricardo O. Vanni; José R Pietrarelli; De Williams; Charles E. Simpson
Bonplandia | 2003
Aveliano Fernández; Antonio Krapovickas; Graciela I. Lavia; Guillermo Seijo
Bonplandia | 2009
Antonio Krapovickas
Boletim de Botânica | 2009
Gerleni Lopes Esteves; Antonio Krapovickas