Determination of UV action spectra affecting the infection process of Oidium neolycopersici, the cause of tomato powdery mildew

Journal of Photochemistry and Photobiology. B, Biology
Aruppillai SuthaparanHans Ragnar Gislerød

Abstract

Oidium neolycopersici, the cause of powdery mildew in tomato, was exposed to UV radiation from 250 to 400 nm for 1, 12, or 24 min. Radiation ≤ 280 nm strongly reduced conidial germination, hyphal expansion, penetration attempt and infection of O. neolycopersici. From 290 to 310 nm the effect depended on duration of exposure, while there was no effect ≥ 310 nm. There were no significant differences within the effective UV range (250-280 nm). Conidial germination on a water agar surface was <20% or around 40%, respectively, if samples were exposed for 1 min within the effective UV range followed by 24h or 48 h incubation. Twelve or 24 min exposure reduced germination to close to nil. A similar trend occurred for germination of conidia on leaf disks on water agar in Petri dishes. The effective UV range significantly reduced all subsequent developmental stages of O. neolycopersici. There was no cytoplasmic mitochondrial streaming in conidia exposed to the effective UV range, indicating that there may be a direct effect via cell cycle arrest. There was no indication of reactive oxygen species involvement in UV mediated inhibition of O. neolycopersici. Optical properties of O. neolycopersici indicated that the relative absorption of ...Continue Reading

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Citations

Nov 28, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Sheona N InnesSissel Torre
Oct 27, 2016·International Journal of Environmental Research and Public Health·Hanns MoshammerDaniela Haluza
Feb 7, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·A F BaisA M Heikkilä
Sep 2, 2021·Horticulture Research·Prisca MeyerBarbara De Coninck
Feb 23, 2021·Plant Disease·Rodrigo Borba OnofreNatalia A Peres

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