13 research outputs found
Chromosome studies in Orchidaceae from Argentina
The center of diversity of Argentinean orchids is in the northeast region of the country. Chromosome numbers and karyotype features of 43 species belonging to 28 genera are presented here. Five chromosome records are the first ones 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, a chromosome number is presented for the first time for 15 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 new cytotype was found. Chromosome data support phylogenetic relationships proposed by previous cytological, morphologic and molecular analyses, and in all the cases cover some gaps in the South American literature on orchid chromosomes
Karyotype Analysis in the F<sub>1</sub> Hybrids of Cristate and Normal Forms of <i>Rumex acetosa</i>
Citogen茅tica de Angiospermas coletadas em Pernambuco: V Cytogenetics of Angiosperms collected in the State of Pernambuco: V
Foram analisadas 33 esp茅cies, entre nativas e introduzidas, pertencentes a 20 fam铆lias de angiospermas ocorrentes no Estado de Pernambuco. A caracteriza莽茫o cariot铆pica da maioria das esp茅cies foi baseada no n煤mero e morfologia cromoss么mica, padr茫o de condensa莽茫o de cromossomos prof谩sicos e estrutura de n煤cleo interf谩sico. Cinco esp茅cies tiveram seus n煤meros cromoss么micos determinados pela primeira vez, sendo elas: Cereus jamacaru (2n=22), Clitoria fairchildiana (2n=22), Eugenia luschnathiana (2n=22), Licania tomentosa (2n=22) e Spondias tuberosa (n=16). No caso de Licania tomentosa esta 茅 a primeira cita莽茫o de n煤mero cromoss么mico para o g锚nero. Das outras 28 esp茅cies, tr锚s (Cecropia cf. palmata, 2n=26; Crinum erubescens, 2n=70; e Schinus terebentifolius, 2n=28) apresentaram n煤meros cromoss么micos diferentes dos registrados previamente na literatura.<br>Thirty three native and introduced species from 20 families of angiosperms collected in the State of Pernambuco were analysed. The karyotype description of the majority of the species was based on chromosome number and morphology, condensation pattern of prophase chromosomes as well as interphase nuclear structure. In five species (Cereus jamacaru, 2n=22; Clitoria fairchildiana, 2n=22; Eugenia luschnathiana, 2n=22; Licania tomentosa, 2n=22; and Spondias tuberosa, n=16) the chromosome number is reported here for the first time. In the case of Licania tomentosa, this is also the first report for the genus. Among the other 28 species, three (Cecropia cf. palmata, 2n=26; Crinum erubescens, 2n=70; and Schinus terebentifolius, 2n=28) showed chromosome numbers different from what has previously been reported