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

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, Ch...

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Main Authors: Chiew-Yen, W., Wan-Loy, C., Marchant, H., Siew-Moi, P.
Format: Article
Published: Faculty of Science, University of Malaya 2004
Subjects:
R Medicine
Online Access:http://eprints.um.edu.my/1982/
http://myais.fsktm.um.edu.my/2066/
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spelling my.um.eprints.19822021-04-28T06:53:57Z http://eprints.um.edu.my/1982/ Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress Chiew-Yen, W. Wan-Loy, C. Marchant, H. Siew-Moi, P. R Medicine 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. Faculty of Science, University of Malaya 2004 Article PeerReviewed Chiew-Yen, W. and Wan-Loy, C. and Marchant, H. and Siew-Moi, P. (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 1394-3065 http://myais.fsktm.um.edu.my/2066/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic R Medicine
spellingShingle R Medicine
Chiew-Yen, W.
Wan-Loy, C.
Marchant, H.
Siew-Moi, P.
Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
description 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.
format Article
author Chiew-Yen, W.
Wan-Loy, C.
Marchant, H.
Siew-Moi, P.
author_facet Chiew-Yen, W.
Wan-Loy, C.
Marchant, H.
Siew-Moi, P.
author_sort Chiew-Yen, W.
title Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
title_short Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
title_full Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
title_fullStr Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
title_full_unstemmed Growth Response, Biochemical Composition and Fatty Acid Profiles of Four Antarctic Microalgae Subjected To UV Radiation Stress
title_sort growth response, biochemical composition and fatty acid profiles of four antarctic microalgae subjected to uv radiation stress
publisher Faculty of Science, University of Malaya
publishDate 2004
url http://eprints.um.edu.my/1982/
http://myais.fsktm.um.edu.my/2066/
_version_ 1698697292226232320
score 13.211869

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