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Microscopic observations of the early development of Pleurotus pulmonarius fruit bodies

     Laboratory of Biotechnology, Research Center for Biological Sciences, Universidad Autónoma de Tlaxcala, Apartado postal 129, Tlaxcala, Tlax., CP 90000, México

David Moore

     Faculty of Life Sciences, The University of Manchester, Manchester, United Kingdom

Gerardo Díaz-Godínez

     Laboratory of Biotechnology, Research Center for Biological Sciences, Universidad Autónoma de Tlaxcala, Apartado postal 129, Tlaxcala, Tlax., CP 90000, México

From observations made by light microscopy, transmission electron microscopy, environmental-scanning and cryoscanning electron microscopy we conclude that the expansion of the young fruit body of Pleurotus pulmonarius involves considerable vacuolation of hyphae but no marked inflation of cell dimensions. There is evidence for an extensive extracellular matrix (ECM), the components of which must be under the control of the hyphae which the ECM surrounds. However the ECM in these fruit bodies is a dilute material. It is easily lost during specimen preparation and is evident only when certain techniques are used to preserve the fluid surface of the hyphae. Observations of the hyphal and fruit body structures with a range of conventional microscopic techniques are crucial to complement the information obtained through physiological and molecular studies for understanding the cellular changes that occur during mushroom development.

Key words: basidiomycetes, electron microscopy techniques, extracellular matrix, hyphal ultrastructure