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THE PLANT CELL, Vol 3, Issue 8 793-799, Copyright © 1991 by American Society of Plant Biologists
Hydrophobin Genes Involved in Formation of Aerial Hyphae and Fruit Bodies in Schizophyllum
JGH. Wessels, OMH. de Vries, S. A. Asgeirsdottir and FHJ. Schuren
Department of Plant Biology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands
Fungi typically grow by apical extension of hyphae that penetrate moist
substrates. After establishing a branched feeding mycelium, the hyphae
differentiate and grow away from the substrate into the air where they form
various structures such as aerial hyphae and mushrooms. In the
basidiomycete species Schizophyllum commune, we previously identified a
family of homologous genes that code for small cysteine-rich hydrophobic
proteins. We now report that the encoded hydrophobins are excreted in
abundance into the culture medium by submerged feeding hyphae but form
highly insoluble complexes in the walls of emerging hyphae. The Sc3 gene
encodes a hydrophobin present in walls of aerial hyphae. The homologous Sc1
and Sc4 genes, which are regulated by the mating-type genes, encode
hydrophobins present in walls of fruit body hyphae. The hydrophobins are
probably instrumental in the emergence of these aerial structures.
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