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Abscisic Acid Action on Basipetal Auxin Transport
Author(s) -
PILET P. E.
Publication year - 1971
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1971.tb01082.x
Subject(s) - abscisic acid , etiolation , auxin , biophysics , chemistry , basal (medicine) , botany , biology , biochemistry , endocrinology , gene , insulin , enzyme
Several experiments have been performed to analyse the ABA effects on the basipetal transport of IAA‐2‐ 14 C, using sections of epicotyls prepared from etiolated Lens seedlings. The sections were incubated in an ABA solution or ABA was applied in the donor blocks containing IAA. For each type of assay, the uptake (analyses of the donor blocks) and the movement of IAA‐C 14 (analyses of the receiver blocks) were inhibited by ABA. The distribution of continuous decrease of the radioactivity, along the sections' axis, showed a 14 C level from the apical towards the basal segments. ABA caused a decrease in the 14 C concentration for the total sections, but a relative increase for the basal segment. When ABA was applied simultaneously with IAA in the donor blocks, the transport velocity of IAA, through the sections, was not changed significantly, while an ABA pretreatment caused a significant decrease.