Karyological studies in Brazilian species of Lippia L. (Verbenaceae)

Sousa, Saulo Marçal de; Torres, Giovana Augusta; Viccini, Lyderson Facio

doi:10.1590/s0001-37652012005000068

Cited by 10 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The cytotype of Lippia alba with 30 chromosomes described as a diploid by Bose and Choudhury (1960) may itself have a polyploid origin and could in fact be a diploid‐like cytotype, which originated by ancient whole genome duplication events, later acquiring disomic behavior. This hypothesis is supported by different authors who hypothesized the basic chromosome number for Lippia as x = 5 (Sanders, 2001; Viccini et al, 2006; Campos et al, 2011; Sousa et al, 2012, 2013) and reinforce the view that polyploidy has played an important role in the evolution of the genus. The fact that we have found a 2 n = 38 cytotype, intermediate between a 2 n = 30 diploid and a 2 n = 45 triploid, that produces some viable pollen is suggestive of a chromosomal base number of below n = 15.…”

Section: Discussionsupporting

confidence: 55%

“…Seven sections are recognized in the genus Lippia (Troncoso, 1974), with section Zapania being the most complex. Considering the data available so far, this section has both the lowest and the highest chromosome number and DNA content recorded (2 n = 20 from L. rubella and 2 n = 56 from L. rotundifolia and L. lacunosa ) including at least three species with high chromosome numbers suggestive of polyploidy: L. lacunosa (2 n = 56), L. rotundifolia (2 n = 56) and L. diamantinensis (2 n = 52) (Viccini et al, 2006; Campos et al, 2011; Sousa et al, 2012, 2013). Lippia alba (Mill.)…”

mentioning

confidence: 98%

See 1 more Smart Citation

Lippia alba (Verbenaceae): A new tropical autopolyploid complex?

Reis

Sousa

Vale

et al. 2014

American J of Botany

Self Cite

View full text Add to dashboard Cite

• Premise of the study: Tropical regions have high species diversity, and polyploidization is a major mechanism of speciation in plants. However, few cases of natural polyploidy have been reported in tropical regions. Lippia alba, is a tropical, aromatic shrub with a wide distribution, extensive morphological plasticity, and several chemotypes. The species has long been recognized as a diploid with 2n = 30 chromosomes. Recently, two variations in chromosome number (2n = 60; 2n = 12-60) have been reported, suggesting the occurrence of polyploidy within the species.• Methods: Flow cytometry was used to investigate the genome size in 106 accessions from 14 Brazilian States. Conventional and molecular cytogenetic techniques and pollen viability analysis were employed to characterize each chromosome number observed.• Key results: The DNA 1C-value varied from 1.17 to 3.45 pg, showing a large variation in genome size. Five distinct chromosome numbers were observed (2n = 30, 38, 45, 60, 90); three are cytogenetically described here for the first time. The 5S rDNA signals varied proportionally according to each chromosome number, but 45S rDNA sites did not. High rates of meiotic irregularity were observed, mainly in cytotypes with higher chromosome numbers.• Conclusions: The data provide new support for the occurrence of a polyploid series in Lippia alba. We provide a hypothesis for how this complex may have arisen. Other cryptic polyploid complexes may remain undiscovered in tropical regions.

show abstract

Section: Discussionsupporting

confidence: 55%

mentioning

confidence: 98%

Lippia alba (Verbenaceae): A new tropical autopolyploid complex?

Reis

Sousa

Vale

et al. 2014

American J of Botany

Self Cite

View full text Add to dashboard Cite

show abstract

“…Estudos citogenéticos recentes com os quimiotipos citral, carvona e linalol de L. alba mostram que o número cromossômico é maior do que se esperava e que os quimiótipos apresentam diferentes padrões cromossômicos. Isto mostra que existe uma estreita relação entre a identidade citogenética da L. alba e o quimiótipo produzido (VICCINI et al, 2006;SOUSA, 2006, PIERRE et al 2011SOUSA et al 2012).…”

Section: Recursos Genéticos E Melhoramento Genéticounclassified

MELHORAMENTO GENÉTICO E ASPECTOS FITOTÉCNICOS DE ERVA-CIDREIRA-BRASILEIRA [Lippia alba (Mill) N.E.Br.]

Amaral¹,

Santos²

2014

Agrarian Academy

View full text Add to dashboard Cite

RESUMO A oferta de produtos naturais oriundos de sistemas de produção agrícola sustentáveis ainda é inversamente proporcional à demanda. A ausência de áreas produtivas com espécies medicinais e aromáticas no cenário agrícola nacional é um exemplo disto. A cultura da erva-cidreira-brasileira [Lippia alba (Mill) N.E.Br.] é uma espécie nativa da América do Sul, amplamente utilizada como medicinal e aromática em diferentes regiões do mundo. Apesar da variabilidade genética desta espécie e a versatilidade das plantas no ambiente, faz-se necessário à conservação da espécie no ambiente natural, e, paralelamente, o melhoramento genético. Assim, o conhecimento integrado entre os aspectos genéticos e agronômicos são imprescindíveis, principalmente, quando se pretende aumentar a produção de óleos essenciais e minimizar a sazonalidade para a indústria. Neste sentido, esta revisão tem por objetivo apresentar e discutir informações a respeito desta espécie com ênfase nos aspectos genéticos e produtivos, destacando novas tecnologias e sistemas de produção utilizados no Brasil e no mundo. Desta maneira, novos estudos poderão ser conduzidos a fim de avaliar o potencial agronômico da L. alba e atrair o interesse das empresas na produção e comercialização de produtos naturais a partir desta espécie. PALAVRAS-CHAVE: Óleos essenciais. Plantas medicinais. Quimiotipos. Terpenóides. BREEDING AND ASPECTS PHYTOTECHNICAL LEMONGRASS-BRAZILIAN[Lippia alba (Mill) N.E.Br.] ABSTRACT The supply of natural products derived from sustainable agricultural system is still inversely proportional to demand. The absence of productive areas with medicinal and aromatic species in the national agricultural scenario is an example of this. The culture of lemongrass-brazilian [Lippia alba (Mill) N.E.Br.] is a species native to South America, widely used as medicinal and aromatic in different regions of the world.

show abstract

“…In spite of intensive pharmacological studies, few studies have been done about biological aspects of the species. Considering the medicinal importance of Plectranthus barbatus and a large number of synonyms reported, basic information such as karyotypic traits are very important, helping the correct plant identification and also the production of commercial varieties in breeding programs ( Sousa et al 2009 , Ferreira et al 2010 , Sousa et al 2010 , Pierre et al 2011 , Sousa et al 2012 , Sousa et al 2013 , Reis et al 2014 , Viccini et al 2014 ). Regarding cytogenetic studies, only the chromosome number and meiosis behavior were reported so far ( De Wet 1958 , Morton 1962 ).…”

Section: Introductionmentioning

confidence: 99%

Contributions to cytogenetics of Plectranthus barbatus Andr. (Lamiaceae): a medicinal plant

Reis¹,

Viccini²,

Sousa³

2015

CCG

View full text Add to dashboard Cite

Accessions of Plectranthus barbatus (Lamiaceae), a medicinal plant, were investigated using a cytogenetic approach and flow cytometry (FCM). Here, we describe for the first time details of the karyotype including chromosome morphology, physical mapping of GC rich bands (CMA3 banding), as well as the mapping of 45S and 5S rDNA sites. All accessions studied showed karyotypes with 2n = 30 small metacentric and submetacentric chromosomes. The CMA3 banding and fluorescent in situ hybridization techniques revealed coincidence between CMA3 bands and 45S rDNA sites (6 terminal marks) while for the 5S rDNA were observed 4 subterminal marks no coincident with CMA3 marks. For nuclear genome size measurement, the FCM procedure provided histograms with G0/G1 peaks exhibiting CV between 2.0–4.9 and the mean values obtained for the species was 2C = 2.78 pg, with AT% = 61.08 and GC% = 38.92. The cytogenetic data obtained here present new and important information which enables the characterization of Plectranthus barbatus.

show abstract

Karyological studies in Brazilian species of Lippia L. (Verbenaceae)

Cited by 10 publications

References 23 publications

Lippia alba (Verbenaceae): A new tropical autopolyploid complex?

Lippia alba (Verbenaceae): A new tropical autopolyploid complex?

MELHORAMENTO GENÉTICO E ASPECTOS FITOTÉCNICOS DE ERVA-CIDREIRA-BRASILEIRA [Lippia alba (Mill) N.E.Br.]

Contributions to cytogenetics of Plectranthus barbatus Andr. (Lamiaceae): a medicinal plant

Contact Info

Product

Resources

About