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Titre :	Genetic diversity in the threatened insular endemic plant Aster asa-grayi (Asteraceae)
Type de document :	Tiré à part de revue
Auteurs :	Masayuki Maki
Année de publication :	1999
Importance :	1-9
Langues :	Anglais (eng)
Catégories :	[CBNPMP-Thématique] Distribution de la diversité génétique [CBNPMP-Thématique] Flux de gènes [CBNPMP-Thématique] Variabilité en protéines, polymorphisme enzymatique [CBNPMP-Géographique] Japon
Mots-clés :	Aster asa-grayi
Résumé :	Genetic diversity in an insular endemic plantAster asa-grayi was examined using enzyme electrophoresis. Distribution ofA. asa-grayi is restricted to only four subtropical islands of Japan, and this species is listed as ‘vulnerable to extinction’ in the Red Data Book of Japanese wild plants. A total of 161 individuals were sampled from five populations on four islands. Genetic diversity values at the population level were very low, compared to other plant species with a similar life history. Genetic variability at the species level is comparable to the mean value of endemic species. Genetic differentiation among populations is extremely high (GST= 0.71), indicating that the gene flow among populations is highly impeded, and pollen and seed dispersal is limited due to the pollinators and the seed morphology. This is because the four islands are geographically isolated. Fixation indices suggested that most populations do not randomly cross. To conserve the genetic diversity of the species, artificial crossings among different island populations are necessary.
Lien pérenne :	DOI : 10.1007/BF00984918
Permalink :	https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130270

Genetic diversity in the threatened insular endemic plant Aster asa-grayi (Asteraceae) [Tiré à part de revue] / Masayuki Maki . - 1999 . - 1-9.
Langues : Anglais (eng)

Catégories :	[CBNPMP-Thématique] Distribution de la diversité génétique [CBNPMP-Thématique] Flux de gènes [CBNPMP-Thématique] Variabilité en protéines, polymorphisme enzymatique [CBNPMP-Géographique] Japon
Mots-clés :	Aster asa-grayi
Résumé :	Genetic diversity in an insular endemic plantAster asa-grayi was examined using enzyme electrophoresis. Distribution ofA. asa-grayi is restricted to only four subtropical islands of Japan, and this species is listed as ‘vulnerable to extinction’ in the Red Data Book of Japanese wild plants. A total of 161 individuals were sampled from five populations on four islands. Genetic diversity values at the population level were very low, compared to other plant species with a similar life history. Genetic variability at the species level is comparable to the mean value of endemic species. Genetic differentiation among populations is extremely high (GST= 0.71), indicating that the gene flow among populations is highly impeded, and pollen and seed dispersal is limited due to the pollinators and the seed morphology. This is because the four islands are geographically isolated. Fixation indices suggested that most populations do not randomly cross. To conserve the genetic diversity of the species, artificial crossings among different island populations are necessary.
Lien pérenne :	DOI : 10.1007/BF00984918
Permalink :	https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130270