The Cytology of<i>Iochroma Tubulosa Benth</i>

Madhavadian, Philomena

doi:10.1080/00087114.1967.10796268

Cited by 5 publications

(1 citation statement)

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“…According to the rule in the family, the low asymmetry is also supported by the fact that all the examined species fall into category 2A of Stebbins' karyotype asymmetry classification (1971) for possessing mainly m chromosomes of homogeneous size, except L. glabra, which falls into category 2B for having a higher interchromosomal asymmetry. Unfortunately, there are only a few (Madhavadian 1967;Moscone 1992;Badr et al 1997;Rego et al 2009;Chiarini et al 2010), where Larnax and Deprea are currently positioned (Olmstead et al 2008;Särkinen et al 2013); hence, additional data are needed for comparative purposes.…”

Section: General Karyotype Featuresmentioning

confidence: 99%

First karyological report in Larnax and Deprea (Solanaceae)

2014

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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.

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