Decomposing cyanobacteria cells are often supposed to be the key stage for releasing inhibiting compounds (Sivonen and Jones,
1999; Song et al., 2007). However, our study revealed that P. malaianus was significantly more sensitive to the exudates of M. aeruginosa than to the extracts. Therefore, compounds exuded throughout the growing period as well as those released after bloom collapse may exert inhibitory effects on at least some growth stages of aquatic macrophytes. Similar results were obtained by Suikkanen et al. (2004), showing that cell-free filtrates of exponen- tially growing Nodularia spumigena inhibited algae monocultures more than those in the stationary growth phase. Although lower than exudates, inhibiting effects of extracts in our study demon- strated that M. aeruginosa allelochemicals are synthesized in cells and then released into the aquatic environment.
Decomposing cyanobacteria cells are often supposed to be the key stage for releasing inhibiting compounds (Sivonen and Jones,1999; Song et al., 2007). However, our study revealed that P. malaianus was significantly more sensitive to the exudates of M. aeruginosa than to the extracts. Therefore, compounds exuded throughout the growing period as well as those released after bloom collapse may exert inhibitory effects on at least some growth stages of aquatic macrophytes. Similar results were obtained by Suikkanen et al. (2004), showing that cell-free filtrates of exponen- tially growing Nodularia spumigena inhibited algae monocultures more than those in the stationary growth phase. Although lower than exudates, inhibiting effects of extracts in our study demon- strated that M. aeruginosa allelochemicals are synthesized in cells and then released into the aquatic environment.
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