Nitric oxide-mediated regulation of the physiological and molecular responses induced by Ultraviolet-B (UV-B) radiation in plants

Abstract

Ultraviolet-B (UV-B) radiation is a part of the sunlight, and plants sessile lifestyle involves continuous exposition to this radiation. Depending on its dose, UV-B could be both harmful, but also a photomorphogenic signal. In this chapter we summarize the knowledge about UV-B direct and indirect effects in plants, as well as the main responses of plants to UV-B. We also describe the role of nitric oxide (NO) in these processes and the coregulation of NO together with the UV RESISTANCE LOCUS-8 (UVR8) pathway of the UV-B-induced gene expression. Finally, we raise open questions that have no answers yet, and are at the heart of the issue to understand the plant signaling pathways modulated by NO under UV-B radiation.