Effects of ultraviolet-B radiation on fungal disease development in Cucumis sativus

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · American Journal of Botany; (USA)

DOI:https://doi.org/10.2307/2444629· OSTI ID:5870023

Orth, A B; Teramura, A H; Sisler, H D ^[1]

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1. Univ. of Maryland, College Park (USA)

Stratospheric ozone depletion due to increased atmospheric pollutants has received considerable attention because of the potential increase in ultraviolet-B (UV-B, 280-320 nm) radiation that will reach the earth's surface. Three cucumber (Cucumis sativus L.) cultivars were exposed to a daily dose of 11.6 kJ m{sup {minus}2} biologically effective ultraviolet-B (UV-B{sub BE}) radiation in an unshaded greenhouse before and/or after injection by Colletotrichum lagenarium (Pass.) Ell. and Halst. or Cladosporium cucumerinum Ell. and Arth. and analyzed for disease development. Two of these cultivars, Poinsette and Calypso Hybrid, were disease resistant, while the third cultivar, Straight-8, was disease susceptible. Preinfectional treatment of 1 to 7 days with UV-B{sub BE} in Straight-8 led to greater severity of both diseases. Postinfectional UV treatment did not lead to increased disease severity caused by C. lagenarium, while preinfectional UV treatment in both Straight-8 and Poinsette substantially increased disease severity. Although resistant cultivars Poinsette and Calypso Hybrid showed increased anthracnose disease severity when exposed to UV-B, this effect was apparent only on the cotyledons. Both higher spore concentration and exposure to UV-B radiation resulted in greater disease severity. Of the cucumber cultivars tested for UV-B sensitivity, growth in Poinsette was most sensitive and Calypso Hybrid was least sensitive. These preliminary results indicate that the effects of UV-B radiation on disease development in cucumber vary depending on cultivar, timing and duration of UV-B exposure, inoculation level, and plant age.

• OSTI ID: 5870023
• Journal Information: American Journal of Botany; (USA), Journal Name: American Journal of Botany; (USA) Vol. 77:9; ISSN 0002-9122; ISSN AJBOA
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
AGE DEPENDENCE
ATMOSPHERIC CHEMISTRY
BIOLOGICAL EFFECTS
CHEMISTRY
CUCUMBERS
DISEASE INCIDENCE
ELECTROMAGNETIC RADIATION
FAR ULTRAVIOLET RADIATION
FOOD
FUNGI
GROWTH
INFECTIVITY
MAGNOLIOPHYTA
MAGNOLIOPSIDA
OZONE
PLANT GROWTH
PLANTS
RADIATIONS
SENSITIVITY
ULTRAVIOLET RADIATION
VEGETABLES