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Population genetic structure of Sisyrinchium micranthum Cav. (Iridaceae) in Itapuã State Park, Southern Brazil.

Tacuatiá LO, Eggers L, Kaltchuk-Santos E, Souza-Chies TT - Genet. Mol. Biol. (2012)

Bottom Line: Molecular analysis showed that the populations are highly structured with low gene flow among them.The population with 2n = 48 was genetically less variable than and distinct from the other populations.Population genetics in relation to cytogenetic data provided new insights regarding the genetic diversification and mating system of S. micranthum.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

ABSTRACT
Sisyrinchium micranthum Cav. is a member of the family Iridaceae, which is distributed over the American continent. In Brazil, this species is found, not only in disturbed areas and coastal regions, but is also very common in urban centers, such as public parks, during the spring. Chromosome counts for North American specimens are 2n = 32 and 2n = 48, whereas in southern Brazil, there is a polyploidy series with three chromosome numbers, 2n = 16, 2n = 32, and 2n = 48. Population analyses using DNA molecular markers are inexistent for this species, in spite of its wide distribution and morphological variation. To study the genetic population structure of S. micranthum, five natural populations were accessed in a conservation park within the Atlantic Rain Forest Biome in southern Brazil. Here, the chromosome numbers 2n = 16 and 2n = 48 had already been described. Molecular analysis showed that the populations are highly structured with low gene flow among them. The population with 2n = 48 was genetically less variable than and distinct from the other populations. Population genetics in relation to cytogenetic data provided new insights regarding the genetic diversification and mating system of S. micranthum.

No MeSH data available.


Related in: MedlinePlus

Itapuã State Park (Parque Estadual de Itapuã-PEI), RS, Brazil and the five populations of Sisyrinchium micranthum studied: ESC172, ESC173, ESC174, ESC195, and ESC208.
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f1-gmb-35-1-99: Itapuã State Park (Parque Estadual de Itapuã-PEI), RS, Brazil and the five populations of Sisyrinchium micranthum studied: ESC172, ESC173, ESC174, ESC195, and ESC208.

Mentions: In 2005, five populations of S. micranthum were sampled in the PEI located in the municipality of Viamão, approximately 57 km from Porto Alegre, Rio Grande do Sul (RS), Brazil (Figure 1). The study sites consisted of a bank site, denominated Guaíba Lagoon, and sites comprising hills with granitic outcrops, viz., Praia de Fora, Pedra da Visão, Pedra da Grota and Praia da Pedreira. Four populations with light violet flowers and one with two flower colors, light violet and light yellow, were collected. Collection sites, coordinates, numbers of collected individuals, and flower colors appear in Table 1. Voucher specimens were deposited in the ICN Herbarium, Instituto de Biociências, Universidade Federal do Rio Grande do Sul.


Population genetic structure of Sisyrinchium micranthum Cav. (Iridaceae) in Itapuã State Park, Southern Brazil.

Tacuatiá LO, Eggers L, Kaltchuk-Santos E, Souza-Chies TT - Genet. Mol. Biol. (2012)

Itapuã State Park (Parque Estadual de Itapuã-PEI), RS, Brazil and the five populations of Sisyrinchium micranthum studied: ESC172, ESC173, ESC174, ESC195, and ESC208.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3313523&req=5

f1-gmb-35-1-99: Itapuã State Park (Parque Estadual de Itapuã-PEI), RS, Brazil and the five populations of Sisyrinchium micranthum studied: ESC172, ESC173, ESC174, ESC195, and ESC208.
Mentions: In 2005, five populations of S. micranthum were sampled in the PEI located in the municipality of Viamão, approximately 57 km from Porto Alegre, Rio Grande do Sul (RS), Brazil (Figure 1). The study sites consisted of a bank site, denominated Guaíba Lagoon, and sites comprising hills with granitic outcrops, viz., Praia de Fora, Pedra da Visão, Pedra da Grota and Praia da Pedreira. Four populations with light violet flowers and one with two flower colors, light violet and light yellow, were collected. Collection sites, coordinates, numbers of collected individuals, and flower colors appear in Table 1. Voucher specimens were deposited in the ICN Herbarium, Instituto de Biociências, Universidade Federal do Rio Grande do Sul.

Bottom Line: Molecular analysis showed that the populations are highly structured with low gene flow among them.The population with 2n = 48 was genetically less variable than and distinct from the other populations.Population genetics in relation to cytogenetic data provided new insights regarding the genetic diversification and mating system of S. micranthum.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Biociências, Departamento de Genética, Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

ABSTRACT
Sisyrinchium micranthum Cav. is a member of the family Iridaceae, which is distributed over the American continent. In Brazil, this species is found, not only in disturbed areas and coastal regions, but is also very common in urban centers, such as public parks, during the spring. Chromosome counts for North American specimens are 2n = 32 and 2n = 48, whereas in southern Brazil, there is a polyploidy series with three chromosome numbers, 2n = 16, 2n = 32, and 2n = 48. Population analyses using DNA molecular markers are inexistent for this species, in spite of its wide distribution and morphological variation. To study the genetic population structure of S. micranthum, five natural populations were accessed in a conservation park within the Atlantic Rain Forest Biome in southern Brazil. Here, the chromosome numbers 2n = 16 and 2n = 48 had already been described. Molecular analysis showed that the populations are highly structured with low gene flow among them. The population with 2n = 48 was genetically less variable than and distinct from the other populations. Population genetics in relation to cytogenetic data provided new insights regarding the genetic diversification and mating system of S. micranthum.

No MeSH data available.


Related in: MedlinePlus