Tendências da literatura científica sobre genética de populações de plantas do Cerrado

Souza, Ueric José Borges de; Telles, Mariana Pires de Campos; Diniz‐Filho, José Alexandre Felizola

doi:10.1590/2236-8906-06/2016

Cited by 7 publications

(7 citation statements)

References 82 publications

(58 reference statements)

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“…To remove the effects of the general tendency for the number of papers to increase over time, the number of papers obtained in each year was divided by the total number of papers found in the Thomson-ISI database, and this value was multiplied by 10 6 , following the approach of Souza et al [26]. The growth in the number of publications was evaluated using linear regression models, as well as the residuals of these models, to analyze the number of papers published per year as a function of time.…”

Section: Scientometric Datamentioning

confidence: 99%

“…The advent and evolution of these techniques has led to an increase in the number of publications, and a progressive expansion in related areas, in particular those with an ecological perspective. Some studies, such as that of Souza et al [26], have evaluated the tendencies in the scientific literature on plant population genetics, although, in this specific case, the study focused only on species from the Brazilian Cerrado savanna. Given this, we decided to test the hypothesis that the popularization of molecular techniques has supported a general tendency for an increasing number of publications that use cpDNA sequences to obtain estimates of genetic diversity in plants.…”

Section: Introductionmentioning

confidence: 99%

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Recent Trends in Research on the Genetic Diversity of Plants: Implications for Conservation

et al. 2019

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Genetic diversity and its distribution, both within and between populations, may be determined by micro-evolutionary processes, such as the demographic history of populations, natural selection, and gene flow. In plants, indices of genetic diversity (e.g., k, h and π) and structure (e.g., FST) are typically inferred from sequences of chloroplast markers. Given the recent advances and popularization of molecular techniques for research in population genetics, phylogenetics, phylogeography, and ecology, we adopted a scientometric approach to compile evidence on the recent trends in the use of cpDNA sequences as markers for the analysis of genetic diversity in botanical studies, over the years. We also used phylogenetic modeling to assess the relative contribution of relatedness or ecological and reproductive characters to the genetic diversity of plants. We postulated that genetic diversity could be defined not only by microevolutionary factors and life history traits, but also by relatedness, so that species more closely related phylogenetically would have similar genetic diversities. We found a clear tendency for an increase in the number of studies over time, confirming the hypothesis that the advances in the area of molecular genetics have supported the accumulation of data on the genetic diversity of plants. However, we found that the vast majority of these data have been produced by Chinese authors, and refer specifically to populations of Chinese plants. Most of the data on genetic diversity have been obtained for species in the International Union for Conservation of Nature (IUCN) category NE (Not Evaluated), which indicates a relative lack of attention on threatened species. In general, we observed very high FST values in the groups analyzed and, as we focused primarily on species that have not been evaluated by the IUCN, the number of plant species that are threatened with extinction may be much greater than that indicated by the listing of this organization. We also found that the number of haplotypes (k) was influenced by the type of geographic distribution of the plant, while haplotype diversity (h) was affected by the type of flower, and the fixation index (FST), by the type of habitat. The plant species most closely-related phylogenetically have similar levels of genetic diversity. Overall, then, it will important to consider phylogenetic dependence in future studies that evaluate the effects of life-history traits on plant genetic diversity.

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Section: Scientometric Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Trends in Research on the Genetic Diversity of Plants: Implications for Conservation

et al. 2019

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“…There is strong interest for genomics and genetics of Cerrado species (Souza et al 2016). Knowledge of basic data as chromosome number, ploidy level and genome size is critical for the selection of model species (Kelly et al 2012).…”

Section: Discussionmentioning

confidence: 99%

The Cerrado (Brazil) plant cytogenetics database

Roa¹,

Telles²

2017

CCG

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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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“…There is strong interest for genomics and genetics of Cerrado species ( Souza et al 2016 ). Knowledge of basic data as chromosome number, ploidy level and genome size is critical for the selection of model species ( Kelly et al 2012 ).…”

Section: Discussionmentioning

confidence: 99%

The Cerrado (Brazil) plant cytogenetics database

Roa¹,

Telles²

2017

CCG

Self Cite

View full text Add to dashboard Cite

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. Intra-specific 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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Tendências da literatura científica sobre genética de populações de plantas do Cerrado

Cited by 7 publications

References 82 publications

Recent Trends in Research on the Genetic Diversity of Plants: Implications for Conservation

Recent Trends in Research on the Genetic Diversity of Plants: Implications for Conservation

The Cerrado (Brazil) plant cytogenetics database

The Cerrado (Brazil) plant cytogenetics database

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