Advances in Microbial Physiology, Vol. 15 by A. H. , Tempest, D. W. , editors Rose

By A. H. , Tempest, D. W. , editors Rose

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Leopold (1971) concluded that monopodial branching is the most economical in terms of branch length for the efficient exposure of the leaves of trees to light and drainage of river basins by streams. e. it ensures efficient cover of the substrate by the mould at the expense of a minimum production of biomass. The leading hyphae of colonies of Allomyces sp. (Emerson, 1955)and Geotrichum cundidum (Trinci, 1970) branch dichotomously as well as laterally, whilst those of Aspergillus niduluns branch sup-apically producing two or more branches per tip (Trinci, 1970).

It is possible that there is a direct relationship between hyphal growth unit length and peripheral growth zone width (Trinci, 1973b). Certainly Morrison and Righelato (1974) have also come to this conclusion. D. e. the ratio KJp is a constant). It follows from Equation 3 that colony radial growth rate will only be directly related to the specific growth rate when the width of the peripheral growth zone of the colony remains constant. 1 . Eflect of Temperature The width of the peripheral growth zone of a colony remains more or less constant when its rate of expansion is altered by temperature (Trinci, 197 1).

P. J. TRlNCl 2. Effect o f Growth Inhibitors Inhibitors such as qdoheximide apparently do not alter peripheral growth zone width (Trinci and Gull, 1970) at least at comparatively low concentrations. Under these circumstances, colony radial growth rate is a reliable parameter of growth (K,/c( is a constant). Several workers have shown that colony radial growth rate decreases with the logarithm of the inhibitor concentration in the medium (Trinci and Gull, 1970; Fevre, 1972; Bret, 1972). The basis for this relationship is not known.

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