Revisiting the role of phenylpropanoids in plant defense against UV-B stress
Revisiting the role of phenylpropanoids in plant defense against UV-B stress
Blog Article
Ultraviolet-B (UV-B) radiation from the past few decades has been widely studied due to the substantial depletion of the stratospheric ozone (O3) layer, causing morphological, physiological, cytological, and biochemical alterations in plants.As a potent abiotic stress factor, enhanced reactive oxygen species (ROS) generation has rumchata proof been flagged as a key factor under UV-B stress.UV-B adversely affects plant growth and development.Plants have evolved defense strategies under UV-B stress to counteract these detrimental effects.
The most common protective response is an accumulation of secondary metabolites.These provide photoprotection by acting as UV-B absorbing compounds through quenching ROS and reactive nitrogen species (RNS).UV-B-induced metabolites share a common origin in the phenylpropanoid biosynthetic pathway.These phenylpropanoids induced via UV Resistance Locus 8 (UVR8) signaling are transcriptionally regulated by MYB transcription factors (TFs) and are efficiently transported to different cellular and membrane-limited compartments.
The accumulation of metabolites like flavonoids, anthocyanins, lignins and tannins in plants marks the importance of its metabolism in UV-B tolerance mechanism.Plant species responded differently to increased UV-B exposure in terms of phenylpropanoid concentration.Apart from UV-B screening agents, these are also potent ROS scavengers due to their here structural composition and less reactive nature.The dynamic balance between ROS accumulation under UV-B stress and its metabolism via phenylpropanoids holds the key to the stress tolerance attributes of a plant.
The present review focuses on the UV-B-induced secondary metabolites in plants, their biosynthesis, and defense strategies that will help in the elucidation of medicinally important bioactive compounds as well as in the development of UV-B tolerant plants.