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Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress

Wong Chiew-Yen, and Chu Wan-Loy, and Harvey Marchant, and Phang Siew-Moi, (2004) Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress. Malaysian Journal of Science, 23 (2). pp. 103-118. ISSN 13943065

Full text not available from this repository.

Official URL: http://ejum.fsktm.um.edu.my

Affiliations

University of Malaya, Faculty of Science, Inst. of Biological Sience, Kuala Lumpur, Malaysia
International Medical University, Kuala Lumpur, Malaysia
Australian Antarctic Division, Kingston, Tasmania, Australia

Abstract

The effects of ultra-violet radiation (UVR) stress on the growth, biochemical composition and fatty acid profiles of four Antarctic microalgae from the University of Malaya Algae Culture Collection (UMACC) were investigated. The microalgae studied were Chlamydomonas UMACC 229, Navicula UMACC 231, Chlorella UMACC 237 and Klebsormidium UMACC 227 which were isolated from samples collected from Casey Station, Antarctica. Three experiments were conducted. In the first experiment, the cultures were exposed to to days of high UVB (515 µWcm⁻²) + Photosynthetically Active Radiation (PAR), UVA (845 µWcm⁻²) + PAR, and PAR alone. In the second experiment, the cultures were illuminated for to days with low UVB (117 µWcm⁻²) + PAR and PAR alone. In the third experiment, the cultures were subjected to short-term (48 hours) exposure of low UVB (117 µWcm⁻²) + PAR and PAR alone. There was no marked difference amongst the four Antarctic microalgae in terms of their growth response to UVB. All the species tested did not grow well after exposure to low (117 µWcm⁻²) or high (515 µWcm⁻²) UVB for 10 days. In contrast, exposure of UVA at 845 µWcm-2 for to days did not affect the growth of the microalgae. Growth of the cultures exposed to UVA for 48 h was only slightly affected compared to those exposed to PAR alone. The effects of UVR on lipid, carbohydrate and protein content did not show consistent trends. However, exposure to UVB resulted in marked decrease of the percentage of polyunsaturated fatty acids (PUFA) in the four microalgae. Thus, fatty acid profile is a distinct biomarker for UVR stress.

Item Type:Journal
Keywords:Antarctic microalgae, biochemical composition, Chlamydomonas, Chlorella, fatty acid profiles, Klebsormidium, navicula, UV radiation
Subjects:Q Science, Computer Science
ID Code:2066

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