Hormogonium Differentiation in the Cyanobacterium Calothrix: A Photoregulated Developmental Process

Hormogonium differentiation is part of the developmental cycle in many heterocystous cyanobacteria. Hormogonia are involved in the dispersal and survival of the species in its natural habitat. The formation of these differentiated filaments has been shown to depend on several environmental condition...

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Bibliographic Details
Published inThe Plant cell Vol. 3; no. 2; pp. 191 - 201
Main Authors Damerval, Thierry, Guglielmi, Gérard, Houmard, Jean, de Marsac, Nicole Tandeau
Format Journal Article
LanguageEnglish
Published United States American Society of Plant Physiologists 01.02.1991
Subjects
Cell growth
Cellular differentiation
Cultured cells
Cyanobacteria
Genes
Light
Plant cells
RNA
Somatic cells
Trichomes
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Summary:Hormogonium differentiation is part of the developmental cycle in many heterocystous cyanobacteria. Hormogonia are involved in the dispersal and survival of the species in its natural habitat. The formation of these differentiated filaments has been shown to depend on several environmental conditions, including spectral light quality. We report here morphological and ultrastructural changes associated with the formation of hormogonia, as well as optimal light conditions required for their differentiation in the cyanobacterium Calothrix sp PCC 7601. The action spectrum for hormogonium differentiation is similar to that which triggers complementary chromatic adaptation because red and green radiation display antagonistic effects in both cases. However, these two photoregulated processes also show major differences. Transcription analyses of genes that are specifically expressed during hormogonium differentiation, as well as of genes encoding phycobiliproteins, suggest that two different photoregulatory pathways may exist in this cyanobacterium.
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ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.3.2.191