The Cerrado (Brazil) plant cytogenetics database
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2017
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Cerrado is a biodiversity hotspot that has lost ca. 50% of its original vegetation cover and hosts ca. 11,000
species belonging to 1,423 genera of phanerogams. For a fraction of those species some cytogenetic characteristics
like chromosome numbers and C-value were available in databases, while other valuable information
such as karyotype formula and banding patterns are missing. In order to integrate and share all
cytogenetic information published for Cerrado species, including frequency of cytogenetic attributes and
scientometrics aspects, Cerrado plant species were searched in bibliographic sources, including the 50
richest genera (with more than 45 taxa) and 273 genera with only one species in Cerrado. Determination
of frequencies and the database website (http://cyto.shinyapps.io/cerrado) were developed in R. Studies
were pooled by employed technique and decade, showing a rise in non-conventional cytogenetics since
2000. However, C-value estimation, heterochromatin staining and molecular cytogenetics are still not
common for any family. For the richest and best sampled families, the following modal 2n counts were
observed: Oxalidaceae 2n = 12, Lythraceae 2n = 30, Sapindaceae 2n = 24, Solanaceae 2n = 24, Cyperaceae
2n = 10, Poaceae 2n = 20, Asteraceae 2n = 18 and Fabaceae 2n = 26. Chromosome number information
is available for only 16.1% of species, while there are genome size data for only 1.25%, being lower than
the global percentages. In general, genome sizes were small, ranging from 2C = ca. 1.5 to ca. 3.5 pg. Intraspecific
2n number variation and higher 2n counts were mainly related to polyploidy, which relates to the
prevalence of even haploid numbers above the mode of 2n in most major plant clades. Several orphan
genera with almost no cytogenetic studies for Cerrado were identified. This effort represents a complete
diagnosis for cytogenetic attributes of plants of Cerrado.
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Cerrado, Shiny-R, Cytogenetics, Database, Scientometrics
Citação
ROA, Fernando; TELLES, Mariana Pires de Campos. The Cerrado (Brazil) plant cytogenetics database. Comparative Cytogenetics, Sofia, v. 11, n. 2, p. 285-297, 2017. DOI: 10.3897/CompCytogen.11(2).11395. Disponível em: https://pubmed.ncbi.nlm.nih.gov/28919965/. Acesso em: 28 jan. 2023.