Chromosomes studies in Orchidaceae from Argentina

DAVIÑA, J. R.; GRABIELE, M.; CERUTTI, J. C.; HOJSGAARD, D. H.; ALMADA, R. D.; INSAURRALDE, I. S.; HONFI, A. I.

GENETICS AND MOLECULAR BIOLOGY

Sociedad Brasilera de Genética

Lugar: Brasil; Año: 2009 vol. 32 p. 811 - 821

1415-4757

The center of diversity of orchids at Argentina is found at its northeast region. Chromosome numbers and karyotype features of 43 species belonging to 28 genera are presented. Five chromosome records are the first at the genus level; these taxa are Aspidogyne kuckzinskii (2n = 42), Eurystyles actinosophila (2n = 56), Skeptrostachys paraguayensis (2n = 46), Stigmatosema polyaden (2n = 40) and Zygostates alleniana (2n = 54). In addition, the first chromosome number is presented for fifteen species: Corymborkis flava (2n = 56), Cyclopogon callophyllus (2n = 28), C. oliganthus (2n = 64), Cyrtopodium hatschbachii (2n = 46), C. palmifrons (2n = 46), Galeandra beyrichii (2n = 54), Habenaria bractescens (2n = 44), Oncidium edwallii (2n = 42), O. fimbriatum (2n = 56), O. pubes (2n = 84), O. riograndense (2n = 56), Pelexia ekmanii (2n = 46), P. lindmanii (2n = 46) and Warrea warreana (2n = 48). For Oncidium longicornu (2n = 42), O. divaricatum (2n = 56) and Sarcoglottis fasciculata (2n = 46+1B?, 46+3B?) a different cytotype was found. Chromosome data support phylogenetic relationships proposed by previous cytological, morphological and molecular analysis and in all the cases cover some gaps in the Southamerican chromosome literature.