Timing of the Auxin Response in Etiolated Pea Stem Sections | Zendy

Grant M. Barkley | Zendy; Michael L. Evans | Zendy

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Timing of the Auxin Response in Etiolated Pea Stem Sections

Author(s) -

Grant M. Barkley,

Michael L. Evans

Publication year - 1970

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.45.2.143

Subject(s) - auxin , elongation , etiolation , pisum , cycloheximide , sativum , biology , growth rate , botany , indole 3 acetic acid , horticulture , biophysics , biochemistry , protein biosynthesis , materials science , geometry , mathematics , ultimate tensile strength , gene , metallurgy , enzyme

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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