BACKGROUND: Marine algae is a productive organism that is consumed as a nutritious food. However, large amounts of unused marine algae are incinerated as trash or dumped in the sea, causing pollution. Recycling algae, a major source of pollution, is important for saving resources and conserving the environment. In this study, the fucoidan which is a major carbohydrate of marine algae was tested as a sourece of fertilizer for farming.
METHODS AND RESULTS: The growth rate of the melon was examined after treating fucoidan and measured the melon growth factors, weight and length of stem. To discover the mechanism of melon growth promotion of fucoidan, bacteria that decomposing fucoidan were isolated from soil and abalone. Bacillus wiedmannii and Stenotrophomonas pavanii were isolated from terrestrial soil and Pseudomonas sp. was isolated from abalone. Among these three bacteria, Pseudomonas sp. had the highest and most specific fucoidan decomposing activity. When Pseudomonas sp. was treated with fucoidan on melon-growing soil, the growth of melon was relatively improved compared to the treatment with fucoidan alone.
CONCLUSION: We found the ability to promote melon growth of fucoidan, the main carbohydrate of marine algae. Fucoidan-decomposing microorganisms were isolated from terrestrial soil and marine organism, and we found that these bacteria stimulate the growth promoting effect of marine algae to the melon. This is the first report that confirm the fertilizer effect of marine algae and shows the use of bacteria with marine algae.