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National Committee on Marine Sciences (NCMS)

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    Quantification and characterization of nuclear genomes in commercial red seaweeds (Gracilariales) from the Philippines
    Kapraun, Donald F.; Lopez-Bautista, Juan; Trono, Gavino; Bird, Kimon T. (Springer, 1996-03)
    Eight species of Gracilariaceae from the Philippines, representing the genera Gracilaria, Gracilariopsis and Hydropuntia, were investigated to quantify and characterize their nuclear genomes. DNA reassociation kinetics were used to determine nuclear genome organization and complexity in six of these species. Results indicate the presence of three second order components corresponding to fast, intermediate and slow fractions. Repetitive sequences varied from 13–74% and unique DNA ranged from 26–84%. Microspectrophotometry with the DNA-localizing fluorochrome DAPI was used to quantify nuclear DNA contents. Comparisons of mean nuclear DNA (I f ) values to chicken erythrocytes (RBC) resulted in an estimate of 0.38–0.43 pg/2 C genomes for seven of the species investigated. Preliminary analyses of agar content and quality confirm the economic potential of Gracilaria firma, Gracilaria sp. 2 from Sorsogon and Gracilariopsis bailinae. Nuclear genome profiles developed from data for genome size, organization and complexity are compared with data for agar quantity and quality. Gel quality and quantity do not appear to be correlated with either large repetitive fraction DNA or a high degree of genome complexity.
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    Zamboanga stakes claim as RP’s top seaweed producer
    (Philippine Star Printing Co., Inc., 2008-03-23)
    In the face of declining seaweed harvests in the country’s traditional major seaweed production centers, the regional office of the Bureau of Fisheries and Aquatic Resources (BFAR) in Region IX has taken bold steps to intensify seaweed culture in the whole Zamboanga Peninsula. “The objectives,” says BFAR Region IX director Virgilio Alforque, “are to help stabilize seaweed supply in the country, enable seaweed processors to operate at higher capacity and, most importantly, make it possible for Zamboanga’s seaweed farmers to take advantage of prevailing high prices.” Fortunately, a new research by SEAFDEC researchers Anicia Hurtado and Renato Agbayani has shown that deep water (more than 10 meters deep) farming of the seaweeds Kappaphycus is possible and very profitable just like the other methods in shallower waters. This method in deeper waters is commonly called alul.