title: Interactions between Arabidopsis DNA repair genes UVH6, DDB1A, and DDB2 during abiotic stress tolerance and floral development.
abstract: Plants must protect themselves from a spectrum of abiotic stresses. For example, the sun is a source of heat, intense light, and DNA-damaging ultraviolet (UV) rays. Damaged DNA binding protein 1A (DDB1A), DDB2, and UV hypersensitive 6 (UVH6)/XPD are all involved in the repair of UV-damaged DNA - DDB1A and DDB2 in the initial damage recognition stage, while the UVH6/XPD helicase unwinds the damaged strand. We find that, as predicted, Arabidopsis ddb1a and ddb2 mutants do not affect uvh6/xpd UV tolerance. In addition, uvh6 is heat sensitive, and ddb1a and ddb2 weakly enhance this trait. The uvh6 ddb1a and uvh6 ddb2 double mutants also exhibit sensitivity to oxidative stress, suggesting a role for DDB1 complexes in heat and oxidative stress tolerance. Finally, we describe a new uvh6 phenotype, the low penetrance production of flowers with five petals and five sepals. ddb1a and ddb2 suppress this phenotype in uvh6 mutants. Interestingly, heat treatment also induces five-petalled flowers in the ddb1a and ddb2 single mutants. Thus UVH6, DDB1A, and DDB2 all contribute to UV tolerance, heat tolerance and floral patterning.
authors.affiliation: Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada.
authors.forename: Valentina
authors.initials: V
authors.lastname: Ly
authors.forename: Avril
authors.initials: A
authors.lastname: Hatherell
authors.forename: Esther
authors.initials: E
authors.lastname: Kim
authors.forename: Ainsley
authors.initials: A
authors.lastname: Chan
authors.forename: Mark F
authors.initials: MF
authors.lastname: Belmonte
authors.forename: Dana F
authors.initials: DF
authors.lastname: Schroeder
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000502:physiology / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D004249:DNA Damage; D004260:DNA Repair; D018744:DNA, Plant / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D035264:Flowers / Q000187:drug effects / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000494:pharmacology; D018519:Meristem / Q000187:drug effects / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D009154:Mutation; D010641:Phenotype; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D018520:Plant Shoots / Q000187:drug effects / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D013312:Stress, Physiological; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D029681:Arabidopsis Proteins; C517426:DDB1a protein, Arabidopsis; C530204:DDB2 protein, Arabidopsis; D018744:DNA, Plant; D004268:DNA-Binding Proteins; D014157:Transcription Factors; C478560:UVH6 protein, Arabidopsis; D006861:Hydrogen Peroxide
keywords: DDB1A; DDB2; Five petals; Heat; NER; UV; UV hypersensitive 6; UVH6; XPD; damaged DNA binding protein 1A; damaged DNA binding protein 2; nucleotide excision repair; ultraviolet; xeroderma pigmentosa D