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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Intrachromosomal karyotype asymmetry in Orchidaceae

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Author(s):
Enoque Medeiros-Neto [1] ; Felipe Nollet [2] ; Ana Paula Moraes ; Leonardo P. Felix [4]
Total Authors: 4
Affiliation:
[1] Universidade Federal da Paraíba. Centro de Ciências Agrárias. Departamento de Ciências Biológicas, Laboratório de Citogenética Vegetal - Brasil
[2] Universidade Federal da Paraíba. Centro de Ciências Agrárias. Departamento de Ciências Biológicas, Laboratório de Citogenética Vegetal - Brasil
[4] Universidade Federal da Paraíba. Centro de Ciências Agrárias. Departamento de Ciências Biológicas, Laboratório de Citogenética Vegetal - Brasil
Total Affiliations: 4
Document type: Journal article
Source: GENETICS AND MOLECULAR BIOLOGY; v. 40, n. 3, p. 610-619, 2017-06-22.
Abstract

Abstract The asymmetry indexes have helped cytotaxonomists to interpret and classify plant karyotypes for species delimitation efforts. However, there is no consensus about the best method to calculate the intrachromosomal asymmetry. The present study aimed to compare different intrachromosomal asymmetry indexes in order to indicate which are more efficient for the estimation of asymmetry in different groups of orchids. Besides, we aimed to compare our results with the Orchidaceae phylogenetic proposal to test the hypothesis of Stebbins (1971). Through a literature review, karyotypes were selected and analyzed comparatively with ideal karyotypes in a cluster analysis. All karyotypes showed some level of interchromosomal asymmetry, ranging from slightly asymmetric to moderately asymmetric. The five tested intrachromosomal asymmetry indexes indicated Sarcoglottis grandiflora as the species with the most symmetrical karyotype and Christensonella pachyphylla with the most asymmetrical karyotype. In the cluster analysis, the largest number of species were grouped with the intermediary ideal karyotypes B or C. Considering our results, we recommend the combined use of at least two indexes, especially Ask% or A1 with Syi, for cytotaxonomic analysis in groups of orchids. In an evolutionary perspective, our results support Stebbins’ hypothesis that asymmetric karyotypes derive from a symmetric karyotypes. (AU)

FAPESP's process: 11/22215-3 - Plant genome responses to environmental variation: what Orchidaceae have to tell?
Grantee:Ana Paula de Moraes
Support Opportunities: Research Grants - Young Investigators Grants