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THE PLANT CELL, Vol 3, Issue 2 191-201, Copyright © 1991 by American Society of Plant Biologists

RESEARCH ARTICLES

Hormogonium Differentiation in the Cyanobacterium Calothrix: A Photoregulated Developmental Process

T. Damerval, G. Guglielmi, J. Houmard and N. T. de Marsac
Unite de Physiologie Microbienne, Centre National de la Recherche Scientifique, Unite de Recherche Associee 1129, Institut Pasteur, 28 rue du Docteur Roux, 75724 Paris Cedex 15, France

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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Copyright © 1991 by the American Society of Plant Biologists