Effect of blue light on indoor seedling culture of Saccharina japonica (Phaeophyta)

Saccharina japonica is a brown alga that has been commercially cultured on a large scale in China. Integrating the light condition under seawater and the adaptation of Saccharina to this condition, it is expected that blue light would be beneficial to Saccharina culture system. Consequently, the det...

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Bibliographic Details
Published in:Journal of applied phycology 2010-12, Vol.22 (6), p.737-744
Main Authors: Wang, Wen-Jun, Sun, Xiu-Tao, Wang, Guang-Ce, Xu, Pu, Wang, Xiang-Yu, Lin, Zhe-Long, Wang, Fei-Jiu
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Chlorophyll fluorescence
Ecology
Freshwater & Marine Ecology
gametophytes
Life Sciences
Phaeophyta
photosynthesis
Plant Physiology
Plant Sciences
sporophytes
zoospores
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Summary:Saccharina japonica is a brown alga that has been commercially cultured on a large scale in China. Integrating the light condition under seawater and the adaptation of Saccharina to this condition, it is expected that blue light would be beneficial to Saccharina culture system. Consequently, the detailed effect of blue light on the key stages during indoor seedling culture of S. japonica was investigated in this study. Irradiances and light qualities had little effect on zoospore attachment and germination. Egg formation occurred sooner under blue light than white light. Under optimum irradiances, 95 ± 4% female gametophytes gave rise to eggs in 6 d under blue light, while it took 12 d for over 90% formation of eggs under white light. Over a culture period of 3 weeks, mean sporeling length and width under blue light was 1.39 and 1.56 times of that under white light, respectively, while the mean sporeling size obtained under red light was only 25% of that under white light. The higher growth rate under blue light was largely due to higher photosynthetic efficiency, as indicated by chlorophyll fluorescence of photosystem II. In addition, the mean ratio of sporeling width to length under blue light was significantly higher than that under white light. These results suggest that blue light would be superior to white light for indoor seedling culture of S. japonica. Based on these findings, an improved S. japonica seedling culture system is discussed.
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-010-9514-x