Morphogenesis of blue-green algae. I. filament development in gloeotrichia
1987
Aziz, A. | Braian, A.W. (Durham Univ. (UK). Dept. of Botany)
Morphogenesis of the axenic blue-green alga Gloeotrichia D613 was studied in batch culture. Hormogonia, juvenile, developing and mature filaments are the stages of filament development. In a developing or a mature filament groups of cells were found giving segmented appearance of a trichome. By following the growth of every cell of hormogonia and their development into mature filaments it has been identified that: i. each group of cells was formed by repeated divisions of a single cell of a juvenile filament; ii. each of these groups was the future hormogonium; iii. for the release of a group the lowermost cell divided and the lower daughter sacrificed; iv. the basal youngest cell of the new hormogonium differentiated into a heterocyst. The groups of daughter cells, the presence of groups even upto the heterocyst and the release of most of these groups as hormogonia are suggestive of the absence of meristematic zone in this alga.
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