A mutation in <I>UVI4</I> gene, which promotes the progression of endoreduplication, confers an increased tolerance against UV-B light

DOI

Bibliographic Information

Other Title
  • UV-Bに超耐性を示す<I>uvi4</I>変異体の解析と遺伝子の単離

Abstract

We have isolated and characterized an ultraviolet-B resistant mutant, uvi4, of Arabidopsis. The fresh weight of uvi4 plants grown under supplemental UV-B light was more than twice of that of the wild type. No significant difference was found in the ability to repair the UV-B-induced cyclobutane pyrimidine dimmers or in the amount of UV-B absorptive compounds, both of which are well known factors that contribute to UV sensitivity. Positional cloning revealed that the UVI4 gene encodes a novel basic protein of unknown function. The UVI4 gene is expressed mainly in actively dividing cells. We found that the hypocotyls cells in uvi4 undergo one extra round of endoreduplication. The uvi4 mutation also promoted the progression of endoreduplication during leaf development. Tetraploid Arabidopsis was hyperresistant to UV-B than diploid Arabidopsis. These results suggest that the enhanced polyploidization is responsible for the increased UV-B tolerance of the uvi4.

Journal

Details 詳細情報について

  • CRID
    1390001205631997952
  • NII Article ID
    130006993464
  • DOI
    10.14841/jspp.2006.0.746.0
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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