Genetic differentiation of three species of Matthiola (Brassicaceae) in the Sicilian insular system

Gianniantonio Domina, Caujapé-Castells, Sánchez

Risultato della ricerca: Article

10 Citazioni (Scopus)

Abstract

We examined the genetic variation of 12 isozyme loci in 14 populations of Matthiola (Brassicaceae) representing the geographic distribution of the species M. incana, M. fruticulosa ssp.fruticulosa and M. tricu.spidata in the Sicilian insular system and the adjacent mainland areas to estimate the levels and apportionment of genetic variation in the insular populations and to understand their population dynamics. The disparity in the distribution of polymorphism in populations of M. incana ssp. incana (low within populations but with high values of FST and GST) contrasts with the homogeneity in the inter-population distribution of the high genetic variation detected in M . tricuspidata and M. fruticulosa ssp. fruticulosa . While the low polymorphism found in M. incana ssp. incana is consistent with its origin through cultivation and the associated lack of gene flow, the Sicilian populations of the other two taxa probably derived from multiple founder events from nearby continental areas and,according to our estimates, have maintained high interpopulational gene flow. Unlike M . incana, the Sicilian populations of M. tricuspidata and M .fruticulosa ssp. Futiculosa could have survived thebglaciations in refugia. This higher antiquity, togetherbwith the maintenance of abundant gene flow, largely explains their high values of genetic variation. In contrast, M. incana ssp. pulchella and M. incana ssp. rupestris have low indices of polymorphism and they are probably neo-endemics, as their distribution areas were severely affected by the Plio-Pleistocene glaciations.
Lingua originaleEnglish
pagine (da-a)81-93
RivistaPlant Systematics and Evolution
Volume253(1-4)
Stato di pubblicazionePublished - 2005

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Matthiola
Brassicaceae
genetic differentiation
genetic variation
gene flow
polymorphism
genetic polymorphism
population distribution
refugium
Matthiola incana
homogeneity
glaciation
population dynamics
Pleistocene
refuge habitats
isozymes
geographical distribution
loci

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

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Genetic differentiation of three species of Matthiola (Brassicaceae) in the Sicilian insular system. / Domina, Gianniantonio; Caujapé-Castells; Sánchez.

In: Plant Systematics and Evolution, Vol. 253(1-4), 2005, pag. 81-93.

Risultato della ricerca: Article

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title = "Genetic differentiation of three species of Matthiola (Brassicaceae) in the Sicilian insular system",
abstract = "We examined the genetic variation of 12 isozyme loci in 14 populations of Matthiola (Brassicaceae) representing the geographic distribution of the species M. incana, M. fruticulosa ssp.fruticulosa and M. tricu.spidata in the Sicilian insular system and the adjacent mainland areas to estimate the levels and apportionment of genetic variation in the insular populations and to understand their population dynamics. The disparity in the distribution of polymorphism in populations of M. incana ssp. incana (low within populations but with high values of FST and GST) contrasts with the homogeneity in the inter-population distribution of the high genetic variation detected in M . tricuspidata and M. fruticulosa ssp. fruticulosa . While the low polymorphism found in M. incana ssp. incana is consistent with its origin through cultivation and the associated lack of gene flow, the Sicilian populations of the other two taxa probably derived from multiple founder events from nearby continental areas and,according to our estimates, have maintained high interpopulational gene flow. Unlike M . incana, the Sicilian populations of M. tricuspidata and M .fruticulosa ssp. Futiculosa could have survived thebglaciations in refugia. This higher antiquity, togetherbwith the maintenance of abundant gene flow, largely explains their high values of genetic variation. In contrast, M. incana ssp. pulchella and M. incana ssp. rupestris have low indices of polymorphism and they are probably neo-endemics, as their distribution areas were severely affected by the Plio-Pleistocene glaciations.",
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T1 - Genetic differentiation of three species of Matthiola (Brassicaceae) in the Sicilian insular system

AU - Domina, Gianniantonio

AU - Caujapé-Castells, null

AU - Sánchez, null

PY - 2005

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N2 - We examined the genetic variation of 12 isozyme loci in 14 populations of Matthiola (Brassicaceae) representing the geographic distribution of the species M. incana, M. fruticulosa ssp.fruticulosa and M. tricu.spidata in the Sicilian insular system and the adjacent mainland areas to estimate the levels and apportionment of genetic variation in the insular populations and to understand their population dynamics. The disparity in the distribution of polymorphism in populations of M. incana ssp. incana (low within populations but with high values of FST and GST) contrasts with the homogeneity in the inter-population distribution of the high genetic variation detected in M . tricuspidata and M. fruticulosa ssp. fruticulosa . While the low polymorphism found in M. incana ssp. incana is consistent with its origin through cultivation and the associated lack of gene flow, the Sicilian populations of the other two taxa probably derived from multiple founder events from nearby continental areas and,according to our estimates, have maintained high interpopulational gene flow. Unlike M . incana, the Sicilian populations of M. tricuspidata and M .fruticulosa ssp. Futiculosa could have survived thebglaciations in refugia. This higher antiquity, togetherbwith the maintenance of abundant gene flow, largely explains their high values of genetic variation. In contrast, M. incana ssp. pulchella and M. incana ssp. rupestris have low indices of polymorphism and they are probably neo-endemics, as their distribution areas were severely affected by the Plio-Pleistocene glaciations.

AB - We examined the genetic variation of 12 isozyme loci in 14 populations of Matthiola (Brassicaceae) representing the geographic distribution of the species M. incana, M. fruticulosa ssp.fruticulosa and M. tricu.spidata in the Sicilian insular system and the adjacent mainland areas to estimate the levels and apportionment of genetic variation in the insular populations and to understand their population dynamics. The disparity in the distribution of polymorphism in populations of M. incana ssp. incana (low within populations but with high values of FST and GST) contrasts with the homogeneity in the inter-population distribution of the high genetic variation detected in M . tricuspidata and M. fruticulosa ssp. fruticulosa . While the low polymorphism found in M. incana ssp. incana is consistent with its origin through cultivation and the associated lack of gene flow, the Sicilian populations of the other two taxa probably derived from multiple founder events from nearby continental areas and,according to our estimates, have maintained high interpopulational gene flow. Unlike M . incana, the Sicilian populations of M. tricuspidata and M .fruticulosa ssp. Futiculosa could have survived thebglaciations in refugia. This higher antiquity, togetherbwith the maintenance of abundant gene flow, largely explains their high values of genetic variation. In contrast, M. incana ssp. pulchella and M. incana ssp. rupestris have low indices of polymorphism and they are probably neo-endemics, as their distribution areas were severely affected by the Plio-Pleistocene glaciations.

UR - http://hdl.handle.net/10447/4364

M3 - Article

VL - 253(1-4)

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