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Structure and function of the elongation sink in the stems of higher plants. *
Author(s) -
MIZUNO AKIKO,
OKAMOTO HISASHI
Publication year - 1982
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11571517
Subject(s) - elongation , hypocotyl , aqueous solution , chemistry , ion , biophysics , cuticle (hair) , aerosol , vigna , nuclear chemistry , biochemistry , botany , materials science , biology , organic chemistry , anatomy , ultimate tensile strength , metallurgy
. Application of an acid aerosol generated from an aqueous HC1 or HNO 3 solution (pH 1‐2) to the hypocotyl segment of Vigna sesquipedalis , excised from the elongation zone and abraded with alumina gel, induced rapid elongation growth comparable with that induced by aerosol generated from neutral 1 mol m −3 1AA aqueous solution. The activity of the first electrogenic ion pump, whose activity is known to be stimulated by IAA aerosol in advance of the increase in growth rate, was little affected by acids. The latent period of the growth response to acids was only 1 min shorter than that to IAA (mean value: 12min), or than the period from the stimulation of the electrogenic ion pump activity by IAA to the beginning of growth acceleration (mean value: 4 min). The growth rate, together with the activities of the first and the second ion pump, was reduced by anoxia in the presence of acid. The acid N 2 ‐sol was ineffective to stimulate the elongation under anoxia. The acid aerosol was ineffective to stimulate the elongation of a non‐abraded segment with intact cuticle layer on its surface.