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Polyploidy increases storage but decreases structural stability in Arabidopsis thaliana

Published:August 08, 2022DOI:https://doi.org/10.1016/j.cub.2022.07.019

      Highlights

      • Polyploidy increases cell volume and tissue storage
      • Higher tissue storage increases water content and drought tolerance
      • Polyploidy incurs biomechanical costs that could limit its evolution
      • Functional consequences of polyploidy can vary with accession

      Summary

      Whole-genome duplication, leading to polyploidy and endopolyploidy, is widespread throughout the tree of life.
      • Otto S.P.
      • Whitton J.
      Polyploid incidence and evolution.
      • te Beest M.
      • Le Roux J.J.
      • Richardson D.M.
      • Brysting A.K.
      • Suda J.
      • Kubesová M.
      • Pysek P.
      The more the better? The role of polyploidy in facilitating plant invasions.
      • del Pozo J.C.
      • Ramirez-Parra E.
      Whole genome duplications in plants: an overview from Arabidopsis.
      Both polyploidy and endopolyploidy can increase cell size via nucleotypic effects, but the phenotypic consequences of increased cell size at the tissue and whole-organism levels are less well understood.
      • Otto S.P.
      • Whitton J.
      Polyploid incidence and evolution.
      • te Beest M.
      • Le Roux J.J.
      • Richardson D.M.
      • Brysting A.K.
      • Suda J.
      • Kubesová M.
      • Pysek P.
      The more the better? The role of polyploidy in facilitating plant invasions.
      • del Pozo J.C.
      • Ramirez-Parra E.
      Whole genome duplications in plants: an overview from Arabidopsis.
      • Kondorosi E.
      • Roudier F.
      • Gendreau E.
      Plant cell-size control: growing by ploidy?.
      We quantified the consequences of autopolyploidy and endopolyploidy in nine diploid accessions of Arabidopsis thaliana, representing a gradient in endopolyploidy, to their corresponding experimentally synthesized neo-tetraploid and neo-octoploid cytotypes. The increase in cell size following genome duplication increased plant storage capacity, which increased tolerance of resource limitation, but also incurred biomechanical costs because of a reduction in the amount of cell wall per unit tissue volume. Our findings also show that the functional consequences of autopolyploidy can vary with accession identity, and the presence of this variation suggests that there is potential for adaptation following whole-genome duplication.

      Keywords

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