Harmful algae bloom constitutes a major problem facing water bodies particularly fresh and marine water system. <i>Microcystis aeruginosa</i> represents a major causative organism found in the water. Light...Harmful algae bloom constitutes a major problem facing water bodies particularly fresh and marine water system. <i>Microcystis aeruginosa</i> represents a major causative organism found in the water. Light plays a major role in the growth and variation of <i>M. aeruginosa</i> in water. What is still inadequate, is the data on the effects of different light conditions on the growth of <i>Microcystis aeruginosa</i>. In this study, two strains of <i>Microcystis aeruginosa</i> PCC 7806 (toxic strain) and PCC 7005 (non-toxic strain) were exposed to varying light intensities at 0, 30, 60, 120, 300, 350 μMol photon m<sup>-2</sup>·S<sup>-1</sup> to measure their growth and pigmentation. This study observed similarities in growth and pigmentation between toxic strain (PCC 7806) and non-toxic (PCC 7005) strain. Also, at short exposure to light, Toxic strain was seen to be better tolerant of light than non-toxic strain, with non-toxic strain showing better ability to recover from light stress after twenty days of culture. These findings suggest that Toxic strain (PCC 7806) and Non-toxic strain (PCC 7005) of <i>M. aeruginosa</i> respond similarly with respect to growth but differ in their light retention capacity over time and this could be useful in predicting the possible conditions of algal bloom.展开更多
Cyanobacterial bloom, also called blue-green algae, all over the world is generating great concern due to the effect of temperature resulting from global warming. Microcystis aeruginosa is well known to be the major c...Cyanobacterial bloom, also called blue-green algae, all over the world is generating great concern due to the effect of temperature resulting from global warming. Microcystis aeruginosa is well known to be the major causative agent of algal bloom. However, there is a need for more critical detection to the relationship between temperature and the growth rate of Microcystic aeruginosa. In the present study, we cultivated the batch culture of Microcystis aeruginosa (Toxic and Non-toxic strain) at five different temperatures 5°C, 10°C, 22°C, 27°C, and 38°C to measure its specific growth rate, pigment contents and cell concentration at each temperature. Our findings indicate that non-toxic strains had higher growth rate at high temperature than the toxic strains, particularly at 22°C. Also, a minimal difference was noticed with the chlorophyll a, carotenoid contents of both strains at varying temperature. The above results indicate the significance of temperature in respect to the two strains of M. aeruginosa and could constitute a promising tool in the prediction of algal bloom.展开更多
文摘Harmful algae bloom constitutes a major problem facing water bodies particularly fresh and marine water system. <i>Microcystis aeruginosa</i> represents a major causative organism found in the water. Light plays a major role in the growth and variation of <i>M. aeruginosa</i> in water. What is still inadequate, is the data on the effects of different light conditions on the growth of <i>Microcystis aeruginosa</i>. In this study, two strains of <i>Microcystis aeruginosa</i> PCC 7806 (toxic strain) and PCC 7005 (non-toxic strain) were exposed to varying light intensities at 0, 30, 60, 120, 300, 350 μMol photon m<sup>-2</sup>·S<sup>-1</sup> to measure their growth and pigmentation. This study observed similarities in growth and pigmentation between toxic strain (PCC 7806) and non-toxic (PCC 7005) strain. Also, at short exposure to light, Toxic strain was seen to be better tolerant of light than non-toxic strain, with non-toxic strain showing better ability to recover from light stress after twenty days of culture. These findings suggest that Toxic strain (PCC 7806) and Non-toxic strain (PCC 7005) of <i>M. aeruginosa</i> respond similarly with respect to growth but differ in their light retention capacity over time and this could be useful in predicting the possible conditions of algal bloom.
文摘Cyanobacterial bloom, also called blue-green algae, all over the world is generating great concern due to the effect of temperature resulting from global warming. Microcystis aeruginosa is well known to be the major causative agent of algal bloom. However, there is a need for more critical detection to the relationship between temperature and the growth rate of Microcystic aeruginosa. In the present study, we cultivated the batch culture of Microcystis aeruginosa (Toxic and Non-toxic strain) at five different temperatures 5°C, 10°C, 22°C, 27°C, and 38°C to measure its specific growth rate, pigment contents and cell concentration at each temperature. Our findings indicate that non-toxic strains had higher growth rate at high temperature than the toxic strains, particularly at 22°C. Also, a minimal difference was noticed with the chlorophyll a, carotenoid contents of both strains at varying temperature. The above results indicate the significance of temperature in respect to the two strains of M. aeruginosa and could constitute a promising tool in the prediction of algal bloom.
