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- W2023239188 abstract "The effect of white light and long- and short-wave ultraviolet light on spore germination, penetration and infection was determined for Ascochyta chrysanthemi on chrysanthemum, A. pisi and A. pinodes on pea and A. imperfecta on lucerne, by means of a detached leaf culture technique. White light and longwave ultraviolet light had no effect on these processes. Short periods of exposure to short-wave ultraviolet light resulted in increased infection, which was most marked in A. chrysanthemi and A. imperfecta , whilst longer exposures (up to 200 s) caused a progressive reduction in infection and spore viability. The increased infection by A. chrysanthemi was due to an increase in the susceptibility of the leaf tissue as a result of exposure to short-wave ultraviolet light. The response of A. chrysanthemi on irradiated leaf tissue of other plants was also altered; the susceptibility of lettuce was increased and the partial resistance of sunflower was destroyed. Spores of all four species survived the effects of short-wave ultraviolet irradiation better on leaf tissue than on agar, and only spores of A. chrysanthemi showed a stimulation in germination on leaf tissue after short periods of exposure to ultraviolet light. There was no alteration in the growth rate of colonies which had developed from spores on agar which had survived irradiation by any of the three light sources." @default.
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- W2023239188 date "1967-09-01" @default.
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- W2023239188 title "The effect of ultraviolet and visible light on infection of host leaf tissue by four species of Ascochyta" @default.
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- W2023239188 doi "https://doi.org/10.1016/s0007-1536(67)80007-x" @default.
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