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EFFECT OF LIGHT ON ASCOSPORE DISCHARGE BY FIVE FUNGI WITH BITUNICATE ASCI
Author(s) -
BROOK P. J.
Publication year - 1975
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1975.tb01342.x
Subject(s) - darkness , ascospore , venturia inaequalis , botany , biology , horticulture , spore , fungicide
Summary Experiments on ascospore discharge from naturally developed perithecia were conducted in a wind tunnel. Discharge by Venturia pirina, V. rumicis and Venturia sp. was stimulated by light, particularly by red, but also by green and blue. There was always a sharp decline in discharge rate after perithecia of these species and of V. inaequalis were plunged from light into darkness. In V. inaequalis a high rate of discharge persisted for several minutes after the change to darkness. It is postulated that in these bitunicate fungi a photoreaction is involved in the rupture of the exoascus tip. Coleroa circinans , another bitunicate species, discharged its ascospores equally readily in light and darkness.