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Auteur Masayuki Maki |
Documents disponibles écrits par cet auteur (3)
Affiner la rechercheGenetic diversity in the threatened insular endemic plant Aster asa-grayi (Asteraceae) / Masayuki Maki (1999)
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] JaponMots-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 Maki, Masayuki 1999 Genetic diversity in the threatened insular endemic plant Aster asa-grayi (Asteraceae). Plant systematics and evolution, 217 : 1-9.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 8241 Maki M. Tiré à part Centre de documentation Tirés à part Consultable High genetic variability revealed by allozymic loci in the narrow endemic fern Polystichum otomasui (Dryopteridaceae) / Masayuki Maki in Heredity, 80 (5) (05/1998)
Titre : High genetic variability revealed by allozymic loci in the narrow endemic fern Polystichum otomasui (Dryopteridaceae) Type de document : Imprimé Auteurs : Masayuki Maki ; Y.J. Asada Année de publication : 1998 Article en page(s) : 604-610 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Ptéridophytes, fougères Mots-clés : Polystichum Résumé : Genetic variability was examined at 16 putative allozymic loci in the narrow endemic fern Polystichum otomasui. Although this species is distributed in only a few valleys within an approximately 10 km×6 km area on the Kyusyu Island of Japan, there are a relatively large number of individuals in this area. The percentage of polymorphic loci (P), the number of alleles per locus (A), the observed heterozygosity (HO) and the expected heterozygosity (HE) were 61.9, 1.93, 0.166 and 0.177, respectively, at the population level, and P, A and HE were 81.3, 2.69 and 0.199, respectively, at the species level, indicating that P. otomasui has extremely high allozymic variation for a fern species. The GST value among the 10 populations examined within the range was 0.108, suggesting that the interpopulation gene flow is high enough to impede genetic structuring. The mating system estimates, Wright's fixation index and the intragametophytic selfing rate, indicate that the species is outcrossing. High genetic variability, in spite of narrowness of the distribution, may have resulted from a recent rapid decline in the population and/or the large effective population size resulting from the extensive gene flow among the populations. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137527
in Heredity > 80 (5) (05/1998) . - 604-610Maki, Masayuki, Asada, Y.J. 1998 High genetic variability revealed by allozymic loci in the narrow endemic fern Polystichum otomasui (Dryopteridaceae). Heredity, 80(5): 604-610.Documents numériques
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Article (1998)Adobe Acrobat PDF
Titre : Tetrasomic segregation of allozyme markers in an endangered plant, Aster kantoensis Type de document : Tiré à part de revue Auteurs : Masayuki Maki ; M. Masuda ; Ken Inoue Année de publication : 1996 Importance : 378-380 Langues : Français (fre) Résumé : Tetrasomic inheritance was documented for four allozyme loci (Aat-2, Aco-2, Pgi-2, and 6pg-2) in a rare endangered plant, Aster kantoensis (Asteraceae). There was no evidence of chromatid segregation, and segregation ratios at the loci were in close agreement with the expectation of tetrasomic inheritance of the chromosome type. This study provides evidence for the autotetraploid origin of A. kantoensis and is one of several studies that have contributed to an increased appreciation of autotetraploidy. Lien pérenne : DOI : 10.1093/oxfordjournals.jhered.a023017 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130271 Maki, Masayuki, Masuda, M., Inoue, Ken 1996 Tetrasomic segregation of allozyme markers in an endangered plant, Aster kantoensis. The Journal of Heredity, 87(5) : 378-380.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 8242 Maki M. Tiré à part Centre de documentation Tirés à part Consultable Documents numériques
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Article (1996)URL
