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OXYGEN—POSITIVE CHEMOTROPIC FACTOR FOR FUNGI?
Author(s) -
ROBINSON PETER M.
Publication year - 1973
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1973.tb02113.x
Subject(s) - spore , germ tube , biology , germination , oxygen , limiting oxygen concentration , microbiology and biotechnology , botany , chemistry , organic chemistry
SUMMARY Tropisms related to the point of emergence of germ‐tubes and to the subsequent direction of growth of germ‐tubes have been considered to be due to labile negative chemotropic factors produced by germinating spore populations. In many assay systems used to demonstrate chemotropic responses of germinating spores the oxygen concentration in the system would be the factor most likely to inhibit growth and evidence is presented which indicates that some of these responses could be caused by a positive chemotropism to oxygen. It is suggested that marked tropic responses to oxygen occur when the oxygen concentration begins to limit spore germination and extension‐growth of the emergent germ‐tubes and a hypothesis is presented to explain the mechanism of these effects.