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Regulation of Growth in Avena (Oat) Stem Segments by Gibberellic Acid and Abscisic Acid
Author(s) -
KAUFMAN PETER B.,
JONES RICHARD A.
Publication year - 1974
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.1399-3054.1974.tb03674.x
Subject(s) - avena , gibberellic acid , abscisic acid , kinetin , biology , botany , chemistry , biochemistry , germination , in vitro , tissue culture , gene
The purpose of this study was to analyze the nature of the interaction between gibberellic acid (GA 3 ) and abscisic acid (ABA) in the regulation of growth in excised Avena (oat) stem segments. Growth, compared to sucrose controls, was inhibited by ABA in the range of 10 −4 to 10 −6 M . GA 3 ‐promoted growth was also inhibited by ABA in the same concentration range. A Lineweaver‐Burk analysis of the interaction between GA 3 and ABA indicated that ABA acts in a non‐competitive fashion with GA 3 . This same result was obtained previously with GA 3 ‐indoleacetic acid (IAA) and GA 3 ‐kinetin interactions with Avena stem sections. Our results indicate that ABA can inhibit GA 3 ‐promoted growth within physiological concentrations, and that it is probably acting at a different physiological site from that for GA 3 .