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Harmful algal blooms: mechanisms, monitoring, and prevention in a rapidly changing world
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The physiological, biochemical characteristics and mechanism of the diatoms Chaetoceros muelleri resting spores formation
P-B1-06
Jun-Rong Liang* , School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China
Qian-Qian Huang, School of Life Sciences, Xiamen University, Xiamen 361102, China
Peng-Yu Ji, School of Life Sciences, Xiamen University, Xiamen 361102, China
Shan-Shan Zhuang, School of Life Sciences, Xiamen University, Xiamen 361102, China
Qin Liu, School of Life Sciences, Xiamen University, Xiamen 361102, China
Fang Han, School of Life Sciences, Xiamen University, Xiamen 361102, China
Chang-Ping Chen, School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China
Ya-Hui Gao, School of Life Sciences, Xiamen University, Xiamen 361102, China
State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, China
Corresponding author: gaoyh@xmu.edu.cn
Presenter Email: sunljr@163.com |
| Except the major contribution to marine carbon fixation, diatoms also account for big proportion of annual POC export fluxes due to diatom resting spore export as a carbon vector out of the mixed layer. The diatom resting spore is a special life stage of some bloom-forming species in response to the collapse of the bloom or environmental stresses, which playing a key role inthe persistence of the diatom's own population. However, little is known about the physiological and biochemical characteristics of diatoms during their resting spores formation. In the present study, the physiological and biochemical characteristics and changes in the resting spores formation of the bloom-forming diatom Chaetoceros muelleri were investigated, including cell morphology, photosynthetic characteristics, cell viability, absorption of nutrients, biological macromolecule content, etc. The comparative analysis of proteins in cell wall and organelle between resting stage cells and vegetative cells of the diatoms provided strong molecular biological evidence for changes in physiological and biochemical characteristics of the resting spores. The RNA-seq technology was also used to investigate the strategy of the diatom self-protection. The findings improved our understanding of the resting spores formation mechanism and their important roles in bloom succession.
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