Auxin-Gibberellin Interactions in Pea: Integrating the Old with the New

These results indicate that, at least in excised segments, auxin partly promotes elongation by increasing the content of GA1

John J. Ross; Damian P. O’Neill; Damien A. Rathbone

2003

Scholarcy highlights

  • Recent findings on auxin-gibberellin interactions in pea are reviewed, and related to those from studies conducted in the 1950s and 1960s
  • It is clear that in elongating internodes, auxin maintains the level of the bioactive gibberellin, GA1, by promoting GA1 biosynthesis and by inhibiting GA1 deactivation
  • These effects are mediated by changes in expression of key GA biosynthesis and deactivation genes
  • We have used the traditional system of excised stem segments, in which auxin strongly promotes elongation, to investigate the importance for growth of auxin-induced GA1
  • The growth response to indole-3-acetic acid was greater in internode segments from LE plants than in segments from the le-1 mutant, in which the step GA20 to GA1 is impaired
  • Unlike the maintenance of GA1 content by auxin, other known relationships among the growth-promoting hormones auxin, brassinosteroids, and GA do not appear to involve large changes in hormone level

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