LIGHT INHIBITION OF UREDOSPORE GERMINATION IN PUCCINIA GRAMINIS VAR. TRITICI
Abstract
Uredospores of Puccinia graminis var. tritici were germinated on one per cent water agar at 10 and 20 C under various light conditions. Short period (two-hour) germination was inhibited by light intensities above 200 foot-candles; however, this was not a permanent and irreversible inhibition, but only a depression of the initial rate of germination, since germination percentage for longer incubation periods (6 to 8 hours) was virtually the same for spores germinating in dark ness and in continuous light. Even for short incubation periods, light inhibition was reversible by a subsequent dark period. The decrease in germination rate due to light is temperature sensitive, the degree of inhibition with a given light intensity being much greater at 10 C than at higher temperatures. Additional evidence for temperature sensitivity is that intensities too low to be inhibitory at 20 C strongly suppress germination at 10 C. The temperature sensitivity indicates the probable involvement of enzymatic as well as photochemical reactions in the light response.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1963
- Accession Number
- AD0410395
Entities
People
- Curtis V. Givan
- K.r. Bromfield
Organizations
- United States Army Biological Warfare Laboratories