Phylogenetic Affiliation of the “Endong” “Spaghetti” Variety of Eucheuma as Revealed by Molecular Data

Issue Date

3-2008

Abstract

A carrageenan-producing seaweed locally referred to as “Endong”/ “Spaghetti” and initially regarded by farmers as a variety of Kappaphycus on the basis of morphological similarity has recently been shown to be a variety of Eucheuma, as indicated by its histological features and carrageenan type. Considering its unique combination of characteristics, it is of interest to determine the phylogenetic relationship of this seaweed with Kappaphycus and Eucheuma varieties. Three genetic markers were sequenced and analyzed to ascertain its phylogenetic affiliation: RuBisCo (rbc) spacer, a portion of the cytochrome oxidase subunit I (cox1) and a small segment of the plastid genome (URP1). Two samples separately collected from two sites (referred to by farmers as “Endong” and “Spaghetti”) were used. Phylogenetic analysis of the rbc spacer sequences confirmed the affiliation of “Endong”/ “Spaghetti” with Eucheuma; their rbc spacer sequences are in fact highly similar to that of E. denticulatum. Results of the analysis of cox1 and URP1 sequences, which were found to be slightly more polymorphic than the rbc spacer, were consistent with the results of the rbc spacer sequence analysis.

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

91

Issue

1

Page

86-93

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

quarterly

Physical Description

illustrations; charts; tables; references

Language

English

Subject

‘Endong’, Eucheuma, Kappaphycus, phylogenetics, ‘Spaghetti’

En – AGROVOC descriptors

EUCHEUMA; CARRAGEENANS; KAPPAPHYCUS ALVAREZII; SEAWEEDS; PLANT MORPHOLOGY; PHYLOGENETIC ANALYSIS; PHYLOGENETICS; MOLECULAR GENETICS

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