Ultrastructural and structural characterization of zygotes and embryos during development in Sargassum cymosum (Phaeophyceae, Fucales)

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• 作者：Ticiane Rover ; Carmen Simioni ; Whitney Hable ; Zenilda L. Bouzon
• 关键词：Cell polarity ; Sargassum cymosum ; Zygote ; Ultrastructure ; Structure
• 刊名：Protoplasma
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：252
• 期：2
• 页码：505-518
• 全文大小：3,530 KB
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• 作者单位：Ticiane Rover (1)
  Carmen Simioni (1)
  Whitney Hable (2)
  Zenilda L. Bouzon (1)
  
  1. Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina (UFSC), Trindade, 88040-900, Florianópolis, Santa Catarina, Brazil
  2. University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA, 02747-2300, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Plant Sciences
  Zoology
  
• 出版者：Springer Wien
• ISSN：1615-6102

文摘

This study investigates the pattern and performance of cellular structures during the early development of zygotes and embryos of Sargassum cymosum. The early development S. cymosum germlings has already been characterized and compared with the pattern of development established for all fucoid algae, in which the zygote remains attached to the receptacle by mucilage during the establishment of polarity and early cell division. As in the algae Fucus and Silvetia, the first division is transverse across the longer axis of the zygote of S. cymosum. However, the cell that will give rise to the rhizoids is not determined in the first division; rather, the formation of this cell occurs with the second division, forming a small cell in the embryo shaded site. Stabilizing polarity during the process of forming a multicellular embryo occurs rapidly. During development, significant cytoplasmic alterations take place. Initially, the cytoplasm shows large clusters of phenolic compounds located in specific parts, but later, in the course of development, these compounds are dispersed in the cytoplasm, although a significant amount remains confined to the nucleus. Moreover, to produce more zygotes and higher growth rates for the germlings, the best conditions found for the species S. cymosum were 22 and 26?°C, respectively.