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ABSTRACT: Background
Pyropia haitanensis thalli, which are made of a single layer of polygonal cells, are a perfect model for studying the morphogenesis of multi-celled organisms because their cell proliferation process is an excellent example of the manner in which cells control their geometry to create a two-dimensional plane.Methods
Cellular geometries of thalli at different stages of growth revealed by light microscope analysis.Results
This study showed the cell division transect the middle of the selected paired-sides to divide the cell into two equal portions, thus resulting in cell sides ≥4 and keeping the average number of cell sides at approximately six even as the thallus continued to grow, such that more than 90% of the cells in thalli longer than 0.08 cm had 5-7 sides. However, cell division could not fully explain the distributions of intracellular angles. Results showed that cell-division-associated fast reorientation of cell sides and cell divisions together caused 60% of the inner angles of cells from longer thalli to range from 100-140°. These results indicate that cells prefer to form regular polygons.Conclusions
This study suggests that appropriate cell-packing geometries maintained by cell division and reorientation of cell walls can keep the cells bordering each other closely, without gaps.
SUBMITTER: Xu K
PROVIDER: S-EPMC5429738 | biostudies-literature | 2017
REPOSITORIES: biostudies-literature
PeerJ 20170511
<h4>Background</h4><i>Pyropia haitanensis</i> thalli, which are made of a single layer of polygonal cells, are a perfect model for studying the morphogenesis of multi-celled organisms because their cell proliferation process is an excellent example of the manner in which cells control their geometry to create a two-dimensional plane.<h4>Methods</h4>Cellular geometries of thalli at different stages of growth revealed by light microscope analysis.<h4>Results</h4>This study showed the cell division ...[more]