Adequate phenylalanine synthesis mediated by G protein is critical for protection from UV radiation damage in young etiolated Arabidopsis thaliana seedlings

• Published in: Plant, cell and environment Vol. 31; no. 12; pp. 1756 - 1770
• Main Authors: WARPEHA, KATHERINE M, GIBBONS, JACK, CAROL, ANDREW, SLUSSER, JAMES, TREE, ROGER, DURHAM, WILLIAM, KAUFMAN, LON S
• Format: Journal Article
• Language: English
• Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.12.2008; Blackwell Publishing Ltd; Blackwell
• Subjects: Arabidopsis - genetics; Arabidopsis - metabolism; Arabidopsis - radiation effects; Arabidopsis Proteins - genetics; Arabidopsis Proteins - metabolism; Biological and medical sciences; Cotyledon - genetics; Cotyledon - metabolism; Cotyledon - radiation effects; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Plant; GTP-Binding Protein alpha Subunits - genetics; GTP-Binding Protein alpha Subunits - metabolism; Mutagenesis, Insertional; Mutation; Phenylalanine - biosynthesis; phenylpropanoid; prephenate dehydratase; Receptors, G-Protein-Coupled - genetics; Receptors, G-Protein-Coupled - metabolism; RNA, Plant - genetics; Seedlings - genetics; Seedlings - metabolism; Seedlings - radiation effects; Signal Transduction; Ultraviolet Rays; UV‐A; UV‐absorbing compounds; UV‐B; phenylpropanoid; Phenylpropanoid pathway; Phenylalanine; UVB radiation; Plant juvenile growth stage; Plant ecology; Ultraviolet absorption; Etiolation; Sporophyte; Arabidopsis thaliana; UV-B; Ultraviolet radiation; UV-A; UV-absorbing compounds; Cruciferae; Dicotyledones; Angiospermae; Spermatophyta; Experimental plant; Damage; G protein; prephenate dehydratase

Etiolated Arabidopsis thaliana seedlings, lacking a functional prephenate dehydratase1 gene (PD1), also lack the ability to synthesize phenylalanine (Phe) and, as a consequence, phenylpropanoid pigments. We find that low doses of ultraviolet (UV)-C (254 nm) are lethal and low doses of UV-B cause sev...