Effect of Light on Growth and Sporulation of Aspergillus ornatus

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Abstract
A. ornatus produces conidia when grown in continuous light but few, if any, when grown in continuous darkness. A minimum of 3 h of exposure to light is needed for induction. Light inhibits growth, glucose uptake and phosphorylation but does not inhibit the uptake of lysine. A low molecular weight substance produced or accumulating in the light inhibits the phosphorylation of glucose. The inhibition of glucose uptake and phosphorylation apparently precedes conidiation, and conidiation may be the result of starvation caused by this light-induced inhibition.