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Diurnal Cycle of Ascus Maturation of Taphrina deformans
C. E. Yarwood
American Journal of Botany
Vol. 28, No. 5 (May, 1941), pp. 355-357
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2436810
Page Count: 3
You can always find the topics here!Topics: Ascospores, Biological rhythms, Spore discharge, Asci, Epidermal cells, Plant cells, Leaves, Spores, Plant morphology, Trees
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Periodic observations of the asci and the use of spore trap slides have revealed a diurnal cycle of the peach leaf curl fungus (Taphrina deformans) on peach trees in a natural environment. Asci start growth from the ascogenous cells in the evening, nuclear divisions occur at night, and spores mature the following day. Ascospores are naturally discharged in greatest numbers in the evening with the maximum at about 8 P.M. which is several hours after they appear morphologically mature. Ascospore discharge is stimulated by the vapors of formalinacetic-alcohol acid fixative, but even under this stimulus they are not subject to discharge until after they are apparently morphologically mature.
American Journal of Botany © 1941 Botanical Society of America, Inc.