ISSN:
1432-072X
Keywords:
Neurospora crassa
;
Colonial temperature sensitive mutant
;
Growth of fungi
;
Branching of fungi
;
Hyphal growth unit
;
Extension zone
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Growth of a temperature sensitive colonial mutant (cot 1) of Neurospora crassa was compared with a wild type strain. The hyphal growth unit (the ratio between mycelial length and number of branches) of the wild type was not appreciably altered by temperature and there was a direct relationship between the specific growth rate (α) of these mycelia and their mean hyphal extension rate (E). The specific growth rate of cot 1 increased by about the same relative amount as the wild type between 15° and 30°C. Cot 1 grew and branched normally at 15° and 25°C but at 30°C the hyphal growth unit and mean hyphal extension rate of the mutant mycelia were reduced. Thus, between 15–30°C the ratio, E/α was constant for the wild type but not for cot 1. The effect of temperature and temperature shifts on extension zone length (Z), extension zone expansion time (Z i ) and branching of leading hyphae of mature colonies were also studies. It is suggested that branching is governed by a mechanism which regulates the linear growth rate of hyphae; the cot 1 mutation may have a direct effect on wall extension or affect linear growth rate indirectly due to an influence on the transport of precursors to the tip.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00428578
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