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Culture observation and molecular phylogenetic analysis on the blooming green alga Chaetomorpha valida (Cladophorales, Chlorophyta) from China |
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| Authors: | DENG Yunyan TANG Xiaorong ZHAN Zifeng TENG Linhong DING Lanping HUANG Bingxin |
| Institution: | 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China 2. Key Laboratory of Marine Genetics and Breeding(Ocean University of China), Ministry of Education, Qingdao 266003, China 3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 4. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Shantou University, Shantou 515063, China |
| Abstract: | The marine green alga Chaetomorpha valida fouls aquaculture ponds along the coastal cities of Dalian and Rongcheng, China. Unialgal cultures were observed under a microscope to determine the developmental morphological characters of C. valida. Results reveal that gametophytic filaments often produce lateral branches under laboratory culture conditions, suggesting an atypical heteromorphic life cycle of C. valida between unbranched sporophytes and branched gametophytes, which differs from typical isomorphic alternation of Chaetomorpha species. The shape of the basal attachment cell, an important taxonomic character within the genus, was found variable depending on environmental conditions. The 18S rDNA and 28S rDNA regions were used to explore the phylogenetic affinity of the taxa. Inferred trees from 18S rDNA sequences revealed a close relationship between C. valida and Chaetomorpha moniligera. These results would enrich information in general biology and morphological plasticity of C. valida and provided a basis for future identification of green tide forming algae. |
| Keywords: | blooming green algae Chaetomorpha valida branch culture observation heteromorphic life cycle molecular phylogeny |
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