摘要
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.
