6
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      The roles of phytochromes in elongation and gravitropism of roots.

      Read this article at

      ScienceOpenPublisherPubMed
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Gravitropic orientation and the elongation of etiolated hypocotyls are both regulated by red light through the phytochrome family of photoreceptors. The importance of phytochromes A and B (phyA and phyB) in these red light responses has been established through studies using phy mutants. To identify the roles that phytochromes play in gravitropism and elongation of roots, we studied the effects of red light on root elongation and then compared the gravitropic curvature from roots of phytochrome mutants of Arabidopsis (phyA, phyB, phyD and phyAB) with wild type. We found that red light inhibits root elongation approximately 35% in etiolated seedlings and that this response is controlled by phytochromes. Roots from dark- and light-grown double mutants (phyAB) and light-grown phyB seedlings have reduced elongation rates compared with wild type. In addition, roots from these seedlings (dark/light-grown phyAB and light-grown phyB) have reduced rates of gravitropic curvature compared with wild type. These results demonstrate roles for phytochromes in regulating both the elongation and gravitropic curvature of roots.

          Related collections

          Author and article information

          Journal
          Plant Cell Physiol
          Plant & cell physiology
          Oxford University Press (OUP)
          0032-0781
          0032-0781
          Feb 2005
          : 46
          : 2
          Affiliations
          [1 ] Department of Botany, Miami University, Oxford, OH 45056, USA.
          Article
          pci038
          10.1093/pcp/pci038
          15695459
          d2fa91e1-919a-4e21-838f-048992bf5599
          History

          NASA Discipline Plant Biology,Non-NASA Center
          NASA Discipline Plant Biology, Non-NASA Center

          Comments

          Comment on this article