Studies On Some Isolates Of Malaysian Cyanophytes

Author

MD QUAMRUL AHSAN

Date

2000

Keyword

Cyanophyta, morphology, isolates, biochemical composition, toxicity evaluation, total carbohydrate

Abstract

The aim of the present study was to isolate, identify and characterise some Cyanophyta of Malaysia. Studies on the morphology, biochemical composition, growth and preliminary toxicity evaluation were carried out on ten isolates of Malaysian Cyanophyta. Among the isolates, only Synechococcus elongatus UMACC 105 is unicellular while the rest are filamentous, including Oscillatoria amphibia UMACC 106, Oscillatoria amphibia UMACC 173, Oscillatoria amphibia UMACC 179, Oscillatoria chilkensis UMACC 194, Oscillatoria rubescens UMACC 214, Oscillatoria subbrevis UMACC 171, Oscillatoria tenuis UMACC 172, Anabaena sp. UMACC 075 and Westiellopsis sp. UMACC 189. Oscillatoria amphibia (UMACC 106 and UMACC 179) showed the highest growth rates (u=0.48 d-1 and u=0.47 d-1) while Anabaena sp. UMACC 075 produced the highest biomass (600 mg L-1 dry weight) followed by Synechococcus elongatus UMACC 105 (400 mg L-1 dry weight) after 16 days' growth. The highest amount of total carbohydrate was produced by Oscillatoria rubescens UMACC 214 (31.5% of dry weight) while highest amount of protein was recorded from Anabaena sp. UMACC 075 (38.4% of dry weight). Synechococcus elongatus UMACC 105 contained the highest amount of lipid (14.6% of dry weight). Synechococcus elongatus UMACC 105 contained the highest amount of totalcarotenoids (5.1 mg g-1 dry weight) as well as the highest amount of total phycobiliproteins (34.4 mg g-1 dry weight). Preliminary toxicity testing showed that the cyanophytes were not toxic to Moina sp.