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THE EFFECT OF SOME PHYSIOLOGICAL AND ENVIRONMENTAL FACTORS ON SCLEROTIAL ASPERGILLI
Author(s) -
Rudolph Emanuel D.
Publication year - 1962
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1962.tb11748.x
Subject(s) - sclerotium , mycelium , conidium , biology , sucrose , botany , spore , lactose , agar , horticulture , food science , bacteria , genetics
R udolph , E manuel D. (Ohio State U., Columbus.) The effect of some physiological and environmental factors on sclerotial Aspergilli. Amer. Jour. Bot. 49(1): 71–78. Illus. 1962.—The effect of varying conditions of carbon‐nitrogen balance, temperature, pH, and light upon the formation of sclerotia by 6 species of Aspergillus ( A. alliaceus, A. avenaceus, A. flavus, A. quercinus, A. sclerotiorum and A. wentii ) was studied. On Czapek's agar, optimal growth as well as maximum production of sclerotia and conidia took place at high sucrose and nitrate concentrations. In general, fewer sclerotia were formed with glucose than with sucrose, and very poor growth took place with lactose. Sclerotia were formed best at temperatures that were optimal or below optimal for mycelial growth. The ranges of pH through which sclerotia were formed were narrower than those through which conidia and mycelia were formed. Light had no effect upon sclerotium formation. The formation of sclerotia in A. alliaceus was found to represent the strand‐type development. A number of UV‐induced strains and a spontaneous mutant strain of A. alliaceus showing varying amounts of sclerotium and conidium production are characterized. It is suggested that the sclerotia in Aspergillus are sterile stromata.