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Research ArticleDevelopment and Growth Regulation
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Correlations between Gravitropic Curvature and Auxin Movement across Gravistimulated Roots of Zea mays

Linda M. Young, Michael L. Evans, Rainer Hertel
Linda M. Young
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Michael L. Evans
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Rainer Hertel
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Published March 1990. DOI: https://doi.org/10.1104/pp.92.3.792

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Abstract

We compared the kinetics of auxin redistribution across the caps of primary roots of 2-day-old maize (Zea mays, cv Merit) seedlings with the time course of gravitropic curvature. [3H] indoleacetic acid was applied to one side of the cap in an agar donor and radioactivity moving across the cap was collected in an agar receiver applied to the opposite side. Upon gravistimulation the roots first curved upward slightly, then returned to the horizontal and began curving downward, reaching a final angle of about 67°. Movement of label across the caps of gravistimulated roots was asymmetric with preferential downward movement (ratio downward/upward = ca. 1.6, radioactivity collected during the 90 min following beginning of gravistimulation). There was a close correlation between the development of asymmetric auxin movement across the root cap and the rate of curvature, with both values increasing to a maximum and then declining as the roots approached the final angle of curvature. In roots preadapted to gravity (alternate brief stimulation on opposite flanks over a period of 1 hour) the initial phase of upward curvature was eliminated and downward bending began earlier than for controls. The correlation between asymmetric auxin movement and the kinetics of curvature also held in comparisons between control and preadapted roots. Both downward auxin transport asymmetry and downward curvature occurred earlier in preadapted roots than in controls. These findings are consistent with suggestions that the root cap is not only the site of perception but also the location of the initial redistribution of effectors that ultimately leads to curvature.

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Correlations between Gravitropic Curvature and Auxin Movement across Gravistimulated Roots of Zea mays
Linda M. Young, Michael L. Evans, Rainer Hertel
Plant Physiology Mar 1990, 92 (3) 792-796; DOI: 10.1104/pp.92.3.792

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Correlations between Gravitropic Curvature and Auxin Movement across Gravistimulated Roots of Zea mays
Linda M. Young, Michael L. Evans, Rainer Hertel
Plant Physiology Mar 1990, 92 (3) 792-796; DOI: 10.1104/pp.92.3.792
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Plant Physiology
Vol. 92, Issue 3
March 1990
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More in this TOC Section

  • The rms1 Mutant of Pea Has Elevated Indole-3-Acetic Acid Levels and Reduced Root-Sap Zeatin Riboside Content but Increased Branching Controlled by Graft-Transmissible Signal(s)
  • Bacterial Cellulose-Binding Domain Modulates in Vitro Elongation of Different Plant Cells
  • Gibberellin Dose-Response Regulation of GA4 Gene Transcript Levels in Arabidopsis
Show more DEVELOPMENT AND GROWTH REGULATION

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