Occurrence of Cellulose Activities in Planktonic Crustaceans Inhabiting Mangrove Areas in Malaysia

DOI Web Site 2 Citations 8 References
  • LIU Wen
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • TANIMURA Aya
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • YAMADA Kyohei
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • TOYOHARA Haruhiko
    Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University
  • CHEW Lilee
    Institute of Ocean and Earth Sciences, University of Malaya
  • HANAMURA Yukio
    Japan International Research Center for Agricultural Sciences National Research Institute of Fisheries Science, Fisheries Research Agency
  • OKUTSU Tomoyuki
    Japan International Research Center for Agricultural Sciences
  • TANAKA Katsuhisa
    Japan International Research Center for Agricultural Sciences National Research Institute of Far Seas Fisheries, Fisheries Research Agency

Abstract

We assessed cellulase activity in several crustaceans of different taxonomic groups inhabiting the mangrove areas of Malaysia to clarify whether these animals could digest cellulose derived from mangrove trees. We investigated four Copepod species, two Mysida species, and ten Decapoda species. Three copepod species demonstrated multiple cellulase active bands that differed among species in a zymographic assay, suggesting that these animals were equipped with distinct cellulases. Interestingly, the way the cellulase were expressed in the zymographic assay differed, even among members of the same species collected at different locations, suggesting that cellulase expression patterns of copepod species are regulated by environmental factors. Although no significant cellulase activity was detected in two of the Mysida species, widespread distribution of cellulases was also detected in decapod species. Multiple common active bands in the various organs of decapod species were detected by the zymographic assay, while remarkable activity was detected in the hepatopancreas in the reducing sugar assay. The above findings suggested that cellulases are synthesized in the hepatopancreas and then secreted into digestive tracts such as the stomach and intestine. The present study shows that various crustaceans comprising most of the biotic resources in mangrove areas may be there because of their ability to digest cellulose.

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