A blog maintained by Tevita Kete, PGR Officer
Secretariat of the Pacific Community (SPC), Suva, Fiji Islands
This weblog documents the activities of Pacific Agricultural Genetic Resources Network (PAPGREN), along with other information on plant genetic resources (PGR) in the Pacific.
The myriad varieties found within cultivated plants are fundamental to the present and future productivity of agriculture. PAPGREN, which is coordinated by the Land Resources Division of the Secretariat of the Pacific Community (SPC), helps Pacific countries and territories to conserve their crop genetic diversity sustainably, with technical assistance from the Bioversity International (BI) and support from NZAID and ACIAR.
SPC also hosts the Centre of Pacific Crops and Trees (CEPaCT). The CEPaCT maintains regional in vitro collections of crops important to the Pacific and carries out research on tissue culture technology. The CEPaCT Adviser is Dr Mary Taylor (MaryT@spc.int), the CEPaCT Curator is Ms Valerie Tuia (ValerieT@spc.int).
PAPGREN coordination and support
Mr William Wigmore
Mr Adelino S. Lorens
Dr Lois Englberger
Mr Apisai Ucuboi
Dr Maurice Wong
Mr Tianeti Beenna Ioane
Mr Frederick Muller
Mr Herman Francisco
Ms Rosa Kambuou
Ms Laisene Samuelu
Mr Jimi Saelea
Mr Tony Jansen
Mr Finao Pole
Mr Frazer Bule Lehi
Interested in GIS?
Thursday, November 03, 2005
Posted 5:30 PM by Luigi
Sandalwood in New Caledonia
From Jacques Tassin, IAC, New Caledonia.
Genetic diversity and population structure of an insular tree, Santalum austrocaledonicum, in New Caledonian archipelago
Molecular Ecology (2005) 14, 1979–1989
L. Bottin *
D. Verhaegen *
J. Tassin *†
I. Olivieri ‡
A. Vaillant *
and J . M. Bouvet *
* CIRAD, Département Forêt, Unité de Recherche ‘Diversité Génétique et Amélioration des Espèces Forestières’, campus de Baillarguet TA 10C, 34398, Montpellier cedex 5, France
† IAC, Institut Agronomique Néo-Calédonien B.P. 73, 98890, Païta, Nouvelle-Calédonie
‡ Université Montpellier 2, cc065, Institut des Sciences de l’Evolution de Montpellier, Place Eugène Bataillon, 34095 Montpellier cedex 05, France
Abstract : We present a study of the genetic diversity and structure of a tropical tree in an insular system. Santalum austrocaledonicum is endemic to the archipelago of New Caledonia and is exploited for oil extraction from heartwood. A total of 431 individuals over 17 populations were analysed for eight polymorphic microsatellite loci. The number of alleles per locus ranged from 3 to 33 and the observed heterozygosity per population ranged from 0.01 in Maré to 0.74 in Ile des Pins. The genetic diversity was lowest in the most recent islands, the Loyautés, and highest in the oldest island, Grande Terre, as well as the nearby small Ile des Pins. Significant departures from panmixia were observed for some loci–population combinations (per population FIS= 0–0.03 on Grande-Terre and Ile des Pins, and 0–0.67 on Loyautés). A strong genetic differentiation among all islands was observed (FST= 0.22), and the amount of differentiation increased with geographic distance in Iles Loyauté and in Grande Terre. At both population and island levels, island age and isolation seem to be the main factors influencing the amount of genetic diversity. In particular, populations from recent islands had large average FIS that could not be entirely explained by null alleles or a Wahlund effect. This result suggests that, at least in some populations, selfing occurred extensively. Conclusively, our results indicate a strong influence of insularity on the genetic diversity and structure of
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