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. 1970 Feb;45(2):143-7.
doi: 10.1104/pp.45.2.143.

Timing of the auxin response in etiolated pea stem sections

G M Barkley  1 , M L Evans
Affiliations

Timing of the auxin response in etiolated pea stem sections

G M Barkley et al. Plant Physiol. 1970 Feb.

Abstract

The short term growth response of etiolated pea stem segments (Pisum sativum L., var. Alaska) was investigated with the use of a high resolution growth-recording device. The immediate effect of treatment with indole-3-acetic acid is an inhibition of growth. This inhibition lasts about 10 minutes, and then the rate of elongation rises abruptly to a new steady rate about 4 times the rate of elongation before auxin treatment. This rapid steady rate of elongation, however, continues for only about 25 minutes before declining suddenly to a lower steady rate of growth about 2 times the rate of elongation before the addition of auxin. Pretreatment of the segments with cycloheximide or actinomycin strongly inhibits both phases of auxin-promoted elongation without altering the length of the latent period in response to the hormone.

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References

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