First karyological report in Larnax and Deprea (Solanaceae)

DEANNA, R.; BARBOZA G. E.; SCALDAFERRO, M.

AUSTRALIAN JOURNAL OF BOTANY

CSIRO PUBLISHING

Lugar: Collingwood; Año: 2014 vol. 62 p. 251 - 261

0067-1924

Somatic chromosomes of 12 samples belonging to eight Larnax Miers species and three Deprea Raf. species are studied. Chromosome number and karyotype analysis of both genera are reported for the first time. All taxa have 2n = 24. The most frequent haploid karyotype formula (8/12) is 9 metacentric (m) + 3 submetacentric 27 (sm) chromosomes, whereas L. glabra (Standl.) N.W. Sawyer and Larnax sp. 1 display 10 m + 2 sm. Karyotypes of L. nieva S. Leiva & N.W. Sawyer and D. cuyacensis (N.W. Sawyer & S. Leiva) S. Leiva & Lezama are prominent for the highest number of sm chromosome pairs, with 7 m + 5 sm and 5 m + 7 sm, respectively, presenting the highest intrachromosomal asymmetry index (A1), whereas Larnax sp. 1 and L. glabra show the lowest A1. Most samples (9/12) examined have only one pair of chromosomes with nucleolar organizer regions (NORs), whereas L. glabra, Larnax sp. 1, and D. cuyacensis possess two pairs of NORs. Systematic considerations about the monophyly of Larnax and Deprea are provided, and some apomorphic and simplesiomorphic traits are postulated. The different karyotype parameters obtained, together with morphological characters, are discussed to single out the species.