ABSTRACT
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Subject(s)
Humans , Female , Child , Dermatitis, Contact/diagnosis , Dermatitis, Contact/drug therapy , Blister/complications , Blister/drug therapy , Dermatitis, Phototoxic/complications , Dermatitis, Phototoxic/drug therapy , Exanthema/complications , Anti-Infective Agents, Local/therapeutic use , Adrenal Cortex Hormones/therapeutic use , Histamine Antagonists/therapeutic use , Plants/adverse effects , Dermatitis, Phototoxic/physiopathology , Furocoumarins/adverse effects , Solar Radiation/adverse effects , Skin Diseases, Vesiculobullous/complications , Skin Diseases, Vesiculobullous/diagnosis , Skin Diseases, Vesiculobullous/drug therapyABSTRACT
Abstract The development and physiology of cord-forming saprotrophic basidiomycetes, which form extensive and persistent mycelial networks in woodland ecosystems, can be conveniently studied on non-sterile soil in laboratory microcosms mimicking field conditions. Morphological responses of Phanerochaete velutina mycelial systems to resource encounters, and decay partitioning following encounters, varied according to whether simulated woody litter was unsterile or autoclaved and on whether encounter took place at the mycelial foraging front or behind the margin (simulating litter fall onto established systems in the field). Results show that encounter of discrete resources by P. velutina is rapidly communicated to the entire mycelial system; that resource capture takes high priority at the expense of continued system extension and decay-derived carbon reallocation; and that polarized growth toward newly encountered resources, previously considered to occur infrequently with this species, may be readily detected using image analysis techniques. Potential advantages of polarized development of P. velutina are discussed.
