Abstract
Ultraviolet-B radiation (280–315 nm), perceived by the plant photoreceptor UVR8, is a key environmental signal that influences plant growth and development and can reduce disease and pest incidence. The positive effect of UV-B on disease resistance and incidence in various plant species supports the implementation of supplemental UV-B radiation in sustainable crop production. However, despite many studies focusing on UV-B light, there is no consensus on the best mode of application. This review aims to analyze, evaluate, and organize the different application strategies of UV-B radiation in crop production with a focus on disease resistance. We summarize the physiological effects of UV-B light on plants and discuss how plants perceive and transduce UV-B light by the UVR8 photoreceptor as well as how this perception alters plant specialized metabolite production. Next, we bring together conclusions of various studies with respect to different UV-B application methods to improve plant resistance. In general, supplemental UV-B light has a positive effect on disease resistance in many plant–pathogen combinations, mainly through the induction of the production of specialized metabolites. However, many variables (UV-B light source, plant species, dose and intensity, timing during the day, duration, background light, etc.) make it difficult to compare and draw general conclusions. We compiled the information of recent studies on UV-B light applications, including e.g., details on the UV-B light source, experimental set-up, calculated UV-B light dose, intensity, and duration. This review provides practical insights and facilitates future research on UV-B radiation as a promising tool to reduce disease and pest incidence.
Highlights
Background light during UVB treatment alters its effects the intensity, duration, or dose of supplemental UV-B radiation is crucial to control disease incidence and the background radiation and UV-B spectrum play an important role[94,122,165,166]
UV-B radiation serves as a useful tool to reduce disease incidence in many different crops and in the model plant Arabidopsis
The efficacy of a UV-B treatment is further complicated by the choice of the UV-B source and the background radiation
Summary
Solar n.m. control: UV-B blocking polyester films (cutoff below 320 nm) control: UV-B blocking clear polyester (cutoff below 320 nm) control: UV-B blocking polyester foil (cutoff below 380 nm) 4h n.a. + continuous UV-B treatment better n.a. 3 days past treatment:
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