EFFECTS OF IAA ON THE PHYSIOLOGICAL AND TOXIN-PRODUCING CHARACTERISTICS OF MICROCYSTIS AERUGINOSA
In order to investigate the effects of indole-3-acetic acid (IAA) on physiological characteristics of Micro-cystis aeruginosa (M. aeruginosa), the growth, photosynthetic pigment content, chlorophyll fluorescence, lipid oxida-tion, and microcystin biosynthesis characteristics were studied. The achieved results showed that there was no signifi-cant variation in cell density, chlorophyll content, chlorophyll fluorescence characteristics, and microcystin contents at low concentrations of IAA (e.g., 0.04 and 0.2 mg/L). However the contents of phycocyanin, allophycocyanin, and malondialdehyde (MDA) decreased in comparison with the control group. High concentrations of IAA (0.04 and 0.2 mg/L) accelerate the algal growth and increased chlorophyll content, while that inhibited the contents of phycocyan-in and allophycocyanin and reduced the peroxidation of membrane lipid peroxidation as well as synthetization of intra-cellular algal toxins. The findings also demonstrated that low concentrations of IAA have no clear influence on the growth and photosynthesis of M. aeruginosa CHAB-6301. However, high concentrations of IAA can promote the growth and photosynthesis of this alga, which may increase the possibility of formation of Microcystis-based water blooms.
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万方数据
维普
