Involvement of Ethylene in the UV-B-Induced Stomatal Closure in Broad Bean
Ultraviolet B (UV-B) irradiation is an important environmental signal for plant growth and development.Despite the well-known that UV-B can regulate stomatal movement and induce ethylene synthesis,the physiological role of ethylene in UV-B-regulated stomatal movement is largely unknown.Here,by epidermal strip bioassay and assays of ethylene production,the role of ethylene in UV-B-regulated stomatal movement was investigated in epidermal strips of broad bean (Vicia faba L.) plants.When epidermal strips were exposed to 0.8 were significantly induced,and ethylene evolution peak preceded the initiation of stomatal closure.Furthermore,the UV-B-induced stomatal closure was largely reversed by interfering ethylene biosynthesis as well as ethylene perception,while exogenous ethylene induced stomatal closure indeed.These results clearly show that ethylene mediates the UV-B-induced stomatal closure in broad bean plants.
ethylenestomatal closureUV-B radiationbroad bean (Vicia faba L.)
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