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. 1978 Apr;61(4):534–537. doi: 10.1104/pp.61.4.534

Red Light-inhibited Mesocotyl Elongation in Maize Seedlings

I. The Auxin Hypothesis 1

Larry N Vanderhoef 1,2, Winslow R Briggs 1
PMCID: PMC1091912  PMID: 16660331

Abstract

Red light-inhibited mesocotyl elongation, which occurs in intact Zea mays L. seedlings, was studied in excised segments which included the coleoptile (or parts therefrom) and apical centimeter of the mesocotyl. Experiments took into account, first, the ability of the segments to regenerate auxin supply sites, and, second, that auxin uptake can be greatly reduced if there is no cut surface, apical to the elongating cells, to act as a port of entry. In all cases, auxin completely reversed the inhibition of elongation by light. The results support the hypothesis that light regulates mesocotyl elongation by controlling auxin supply from the coleoptile. Sucrose concentration had no effect on auxin reversal of light-inhibited elongation, but relatively high concentrations of gibberellic acid (10 μm) could substitute for auxin in this system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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