By A. H. , Tempest, D. W. , editors Rose
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Additional resources for Advances in Microbial Physiology, Vol. 15
Sympodial branching patterns have been observed in Ascobolus immersus colonies where parent hyphal tips are successively overtaken by their branches (Chevaugeon, 1959). The density of the hyphae at the circumference of a mature colony remains more or less constant as it increases in radius. This observation suggests that there is a periodic generation of new leading hrphae 26 A. T. BULL AND A. P. J. TRlNCl as the colony increases in diameter. Presumably these new leading hyphae arise as the result of primary branches increasing in diameter and growth rate until they assume the position and characteristics of leading hyphae (Trinci, 1973b).
BULL AND A. P. J. TRlNCl Bornefeld and Lysek, 1972. The interested reader will find the stimulating papers of Winfree (1970,1973)a valuable source offurther information and ideas. wz, and several classes of morphological mutants liave been described in which the periodicity has been disturbed. In the (01 niutaiits, for example, a partial block in pentose phosphate pathway has been implicated as a specific biochemical lesion (Brody, 1970; see also Section VIII, C; p. 70). Halaban (1975) recently has described a palch mutant that produced alternatively, o n a medium containing 5% glucose, sparse and dense aerial hyphae with a periodicity of about 50 hours but had retained the wild- type circadian rhythm of conidiation.
Nutrient Concentration The concentration of nutrients in the environment decreases progressively as colonization proceeds, but whether or not this has a direct effect upon the growth rate of the mould depends upon the original nutrient concentration and the affinity of the mould (K,value) 28 A. T. BULL AND A. P. J. TRlNCl for the particular nutrient which may eventually limit growth. Moulds, like bacteria, generally have a high affinity for essential nutrients h e . a low K,value); thus, the concentration of the limiting nutrient has to be decreased to a very low level before it causes a lowering in growth rate.
Advances in Microbial Physiology, Vol. 15 by A. H. , Tempest, D. W. , editors Rose