First karyological report in Larnax and Deprea (Solanaceae)
Rocío Deanna A B D , Gloria E. Barboza A B and Marisel A. Scaldaferro A C
+ Author Affiliations
- Author Affiliations
A Instituto Multidisciplinario de Biología Vegetal (IMBIV), CONICET and Universidad Nacional de Córdoba, CC 495, CP 5000, Córdoba, Argentina.
B Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Córdoba, Argentina.
C Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN), Universidad Nacional de Córdoba, Avenue Vélez Sarsfield 299, CP 5000, Córdoba, Argentina.
D Corresponding author. Email: rociodeanna@gmail.com
Australian Journal of Botany 62(3) 251-261 https://doi.org/10.1071/BT14041
Submitted: 27 February 2014 Accepted: 7 June 2014 Published: 3 July 2014
Abstract
Somatic chromosomes of 12 samples belonging to seven 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 of 12 samples) is 9 metacentric (m) + 3 submetacentric (sm) chromosomes, whereas L. glabra (Standl.) N.W. Sawyer and Larnax sp. 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 remarkable 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. and L. glabra show the lowest A1. Most samples (9 of 12) examined have only one pair of chromosomes with nucleolar organiser regions (NOR), whereas L. glabra, Larnax sp., and D. cuyacensis possess two pairs of NOR. Systematic considerations about the monophyly of Larnax and Deprea are provided. The different karyotype parameters obtained, together with morphological characters, are discussed to single out the species.
Additional keywords: AgNOR, cytogenetics, Feulgen, monophyly, South America.
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