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Effects of Daphnia ‐Associated Infochemicals on the Morphology, Polysaccharides Content and PSII‐Efficiency in Scenedesmus obliquus
Author(s) -
Yang Zhou,
Kong Fanxiang,
Shi Xiaoli,
Xing Peng,
Zhang Min
Publication year - 2007
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.200710963
Subject(s) - polysaccharide , extracellular polysaccharide , scenedesmus obliquus , biology , daphnia , botany , extracellular , extracellular polymeric substance , morphology (biology) , algae , food science , bacteria , biochemistry , biofilm , ecology , zoology , genetics , crustacean
We investigated the effects of infochemicals from Daphnia carinata on the morphology, polysaccharides yield and PSII‐efficiency in Scenedesmus obliquus . Infochemicals released from D. carinata induced colony formation in S. obliquus . The contents of soluble extracellular polysaccharides, bounded extracellular polysaccharides, and the total polysaccharides per cell in the induced colonies of S. obliquus increased significantly relative to those of the unicells, which indicated that Daphnia ‐associated infochemicals could also stimulate S. obliquus to increase the synthesis of extracellular polysaccharides. The increased extracellular polysaccharides may play an important role in cementing S. obliquus cells together to form colonies. In addition, no significant differences in growth, the maximal efficiency of PSII photochemistry (F v /F m ), and the effective quantum yields of PSII ( Φ PSII ) were detected between unicellular and induced colonial populations, which showed that the cost of induced colony formation was not reflected on these indices. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)