Molecular differentiation of two morphological variants of gracilaria salicornia

Lim, Phaik Eem and Thong, Kwai Lin and Phang, Siew Moi (2001) Molecular differentiation of two morphological variants of gracilaria salicornia. Journal of Applied Phycology, 13. pp. 335-342. ISSN 0921-8971, DOI https://doi.org/10.1023/a:1017532624398.

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Abstract

Xia in 1986 combined Gracilaria salicornia, G. canaliculata (G. crassa), G. cacalia and G. minor into one species: G. salicornia. Two morphological variants of G. salicornia were collected from different localities in Malaysia. Variant A collected from Morib, Selangor grew on the roots of Avicennia. The samples showed absence of main axis; segmented constrictions throughout; cylindrical or slightly compressed thalli. Variant B was collected from the mudflats of Tanjung Tuan, growing on rocks, coral or forming mats on the mud. Plants showed absence of main axis; segments were not constricted throughout the plant (if present only slightly articulated at the upper part), branching was dichotomous or irregular; cylindrical or slightly compressed thalli. The technique of Random Amplified Polymorphic DNA analysis (RAPD) was used to investigate molecular characteristics of the two variants. Out of sixty Operon primers that were screened, four primers, OPA 1, OPA 10, OPA 11 and OPK 7 were able to give polymorphism. The fingerprints generated were stable and reproducible on repeated analysis. The DNA fingerprints generated were visually analysed and clustering analysis was carried out using GelCompar 4.0. The matrix of similarities was based on the Dice coefficients (SD) and the cluster analysis was carried out using the unweighted pair group method using arithmetic averages (UPGMA). DNA analysis showed that two primers (OPA 01, CAGGCCCTTC and OPK 07, AGCGAGCAAG) were able to differentiate the two variants.

Item Type:	Article
Funders:	UNSPECIFIED
Uncontrolled Keywords:	Gracilaria salicornia; molecular taxonomy; random amplified polymorphic DNA (RAPD)
Subjects:	Q Science > QR Microbiology
Divisions:	Faculty of Science > Institute of Biological Sciences
Depositing User:	Prof. Dr Kwai Lin Thong
Date Deposited:	29 Dec 2015 00:27
Last Modified:	29 Dec 2021 01:13
URI:	http://eprints.um.edu.my/id/eprint/15364

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