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Keywords:

  • Key words;
  • Etioplast;
  • gibberellin;
  • Hordeum;
  • phytochrome

Summary

Gibberellin-like substances were extracted from light-treated etioplasts to test the hypothesis that phytochrome controls their efflux. Results obtained using sucrose density centrifugation showed that phytochrome mediates a change in the extractability of gibberellins and does not mediate changes in the permeability of the etioplast envelope membrane with respect to gibberellins, as previously proposed.