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?
Monday, April 19, 2004
Posted 9:10 PM by Luigi
Important taro publication
Characterisation of taro (Colocasia esculenta (L.) Schott) genetic resources in Southeast Asia and Oceania
Lebot V.; Prana M.S.; Kreike N.; van Heck H.; Pardales J.; Okpul T.; Gendua T.; Thongjiem M.; Hue H.; Viet N.; Yap T.C.
Genetic Resources and Crop Evolution, June 2004, vol. 51, iss. 4, pp. 381-392(12)
Kluwer Academic Publishers
Abstract Morphological characterisation of 2,298 accessions collected in Indonesia, Malaysia, Thailand, Vietnam, the Philippines, Papua New Guinea and Vanuatu was conducted with 23 standardised descriptors and data bases were developed. More than 2,000 cultivars were electrophoresed on starch gels and six enzyme systems were revealed successfully (MDH, PGI, ICD, PGD, ME, SKDH). Each country selected a core sample for sharing composed of elite cultivars representing approximately 10% of the total number of accessions. Ploidy levels were determined using flow cytometry. AFLP fingerprinting was conducted on all cultivars included in the core sample. Meristems were excised and these genotypes were tissue cultured, indexed for DMVand distributed to participating countries. InVanuatu, 378 cultivars were grown in a common plot, planted and harvested the same day, and their corms were boiled and submitted to a blind panel test composed of ten participants. Their eating quality was scored on a scale from 1 to 6 (excellent). The physico-chemical characteristics of 31 cultivars, representing different morphotypes and including excellent and poor cultivars, were analysed to assess the extent of variation existing for traits related to corm quality (dry matter content, minerals, lipids, proteins, gelatinisation temperature, amylose, glucose, fructose, saccharose, maltose and starch content). The results of these studies indicate that the genetic base of the cultivars is narrow. Only six zymotypes represent more than 51% of the total number of accessions electrophoresed and only 21 zymotypes represent more than the two thirds (70%) of the total number of accessions. AFLP analysis confirm the isozymes results and two distinct genepools are revealed, one in S.E. Asia and the other in the Pacific. It implies that crosses between accessions originating from only one country are not desirable and it is appropriate to cross cultivars from both genepools. Except for the temperature of gelatinisation, all physicochemical characteristics are variable. Good taste is correlated with high dry matter, starch and amylose contents.
* Comments:Post a Comment
Agrobiodiversity Weblog: For discussions of conservation and sustainable use of the genetic resources of crops, livestock and their wild relatives.