The ability of four growth retardants to inhibit the endogenous growth of
Avena first internode sections, as well as the effects of interactions between the retardants and GA
3 or IAA on the elongation of the sections have been investigated. The results obtained are summarized in Tables 1 and 2.
The normal elongation of the sections is not significantly inhibited by treatments with any of the growth retardants employed, except with high concentrations of AMO-1618 or Phosfon D.
The simultaneous treatment of a high concentration of Phosfon D (10
-4M) with GA
3 or IAA partially reduces the expected elongation, whereas AMO-1618, B-995 and CCC when applied in a analogous treatment have little effect.
Phosfon D at a concentration of 10
-5 M or 10
-6 M and exogenously applied GA
3 havea synergistic effect on the elongation of
Avena first internode sections.
The significance of these results for the understanding of the mode of action of growth retardants is discussed.
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