Assessment of genetic diversity within eucheumatoid cultivars in east Sabah, Malaysia

Tan, Pui-Ling and Poong, Sze-Wan and Tan, Ji and Brakel, Janina and Gachon, Claire and Brodie, Juliet and Sade, Ahemad and Lim, Phaik-Eem (2022) Assessment of genetic diversity within eucheumatoid cultivars in east Sabah, Malaysia. Journal of Applied Phycology, 34 (1). pp. 709-717. ISSN 0921-8971, DOI

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Studies have shown that cultivars of the carrageenophytes Kappaphycus and Eucheuma are clones of a limited number of strains originally domesticated from wild populations. For the development and selection of new cultivars, it is important that a comprehensive record of available variants exists. This study was conducted to provide up-to-date analysis and compilation of the current state of cultivars as the last list of cultivars was compiled nearly a decade ago. The present study analyzed the cox2-3 spacer and cox1 (1356 bp) genetic diversity of cultivars collected from 2019 to 2020 from the east coast of Sabah where the seaweed farms are concentrated. These data were compared with cultivars reported from 2010 to 2012 to assess changes, if any, to the gene pool of farmed eucheumatoid in Malaysia. Kappaphycus alvarezii, K. striatus, and K. malesianus are currently cultivated while Eucheuma denticulatum is no longer an important cultivar compared to a decade ago, probably due to its lower price. Analysis of the cox2-3 spacer revealed a new haplotype, LBT10, and, by including published GenBank data, a further four previously unnamed haplotypes were recognized from Sabah. This study confirms that there is a limited gene pool within cultivars in Malaysia and suggests the need for new or genetically diverse cultivars which can adapt to a changing environment, to ensure a more sustainable carrageenan industry.

Item Type: Article
Funders: UKRI through the GlobalSeaweed-STAR project [BB/P027806/1] [IF015-2019], GlobalSeaweedSTAR Research Fund [RF002] [IF059-2019], Ministry of Higher Education Malaysia through the Higher Institution Centre of Excellence (HICoE) project [IOES-2014H]
Uncontrolled Keywords: Kappaphycus; Eucheuma; Rhodophyta; Cultivation; Genetic variation; cox2-3 spacer; cox1
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QR Microbiology
T Technology > TP Chemical technology
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Apr 2022 07:44
Last Modified: 28 Apr 2022 07:44

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