Canadian Journal of Botany - Revue Canadienne de Botanique (1998) 76, 2093-2099

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Antonia Fourtouni, Yiannis Manetas and Christos Christias (1998)
Effects of UV-B radiation on growth, pigmentation, and spore production in the phytopathogenic fungus Alternaria solani
Canadian Journal of Botany - Revue Canadienne de Botanique 76 (12), 2093-2099
Abstract: The effects of mild UV-B radiation doses on growth, pigmentation, and spore production in the leaf spot pathogen Alternaria solani Sorauer grown under a polychromatic (UV-A plus visible) radiation environment were investigated. UV-B radiation reduced significantly the radial growth of the fungus. It also had a negative effect on dry mass production and stimulated increased hyphal density. The highest values for UV-B absorbing compounds and melanin content (expressed on a dry mass basis) were observed in the treatment without UV-B. Low doses of UV-B radiation depressed UV-B absorbing capacity and melanin content with a gradual increase with increasing doses. However, the final attained values never surpassed those of the treatment without UV-B. Spore production was significantly enhanced by UV-A radiation. UV-B radiation had either a stimulatory or suppressive effect on spore production depending on the fluence rates of background UV-A radiation. The results indicate that A. solani employs mainly a morphological (i.e., increased density) rather than chemical (i.e., UV-B absorbing compounds) protective strategy against UV-B radiation damage. They also suggest that UV-B radiation reaching the surface of the earth may adversely affect the growth of this highly virulent fungus, although additional studies are required to test this hypothesis.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Christos Christias

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Alternaria solani
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