Abstract
There are several apparent developmental stages in the life cycle of Nostoc sphaeroides Kützing, an edible cyanobacterium found mainly in paddy fields in central China. The cytochemical changes in developmental stages such as hormogonia, aseriate stage, filamentous stage and colony in N. sphaeroides were examined using fluorescent staining and colorimetric methods. The staining of acidic and sulfated polysaccharides increased with development when hormogonia were used as the starting point. Acidic polysaccharides (AP) were most abundant at the aseriate stage and then decreased, while the sulfated polysaccharides (SP) were highest at the colony stage. Quantitatively, along the developmental process from hormogonia to colony, total carbohydrates first increased, then became stable, and then reached their highest level at the colony stage, while reducing sugars were highest at the hormogonia stage and then decreased sharply once development began. SP were not detectable in the hot water soluble polysaccharides (HWSP), and hormogonia had the lowest content of AP, while old colonies had the highest. The AP content of the aseriate stage, filamentous stage and young colony stage were very similar. The evolutionary relationships reflected in the developmental stages of N. sphaeroides are discussed.
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Acknowledgments
The authors are grateful to Dr. Zebo Huang from Wuhan University and Dr. Renhui Li from the Institute of Hydrobiology, CAS for their efforts in improving the manuscript. This research was financially supported by an innovation project of CAS (KZCX2-YW-426) and a National Basic Research program of China (2002CB412306).
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Li, D., Xing, W., Li, G. et al. Cytochemical changes in the developmental process of Nostoc sphaeroides (cyanobacterium). J Appl Phycol 21, 119–125 (2009). https://doi.org/10.1007/s10811-008-9340-6
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DOI: https://doi.org/10.1007/s10811-008-9340-6