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9 10

22.00 h

11 12 13

Age of culture

14 15 days

Figure 11.9 Rate of spore discharge from cultures of Sordaria fimicola under alternating conditions of light (unshaded area) and dark (shaded area). Cultures were grown in continuous light until day 12, and then light periods were made to correspond with "natural" period of maximum discharge for three days. The phasing of the light periods was then shifted through 12 hours by imposing either a 24 hour-period of light (a) or darkness (b). Spore discharge was immediately entrained to the new light phase. (From Austin (1968). With permission of the publisher.)

9 10

22.00 h

11 12 13

Age of culture

14 15 days

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