Enhancement of lateral bud growth in Coleus blumei BENTH. by (2-chloroethyl) trimethylammonium chloride (CCC)

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The relationship of GA to apical dominance in Coleus was examined by substituting 1% IAA, in lanolin, for the shoot apex of CCC-treated, control and GA-treated plants containing, theoretically, hyponormal, normal and hypernormal GA levels, respectively. The greatest inhibition of lateral bud growth was obtained in the treatment combining 1% IAA and 100 ppm GA, suggesting that GA may be important in the apical dominance of Coleus. CCC inhibited main axis growth, reduced the level of endogenous GA and caused a marked release of lateral buds from apical dominance. The significant stimulation of lateral bud growth by CCC could not be ascribed to reduced endogenous GA since it was not reversed by exogenous GA, or by GA plus IAA, whereas 100 ppm GA overcame the inhibition of main axis growth by CCC. It was also shown that the CCC stimulation was not a result of compensatory growth, that is, enhanced lateral bud growth resulting from reduced apical bud growth. The CCC effect on lateral buds was interpreted as involving a system independent of auxin and GA or else a possible immobilization of auxin in addition to inhibition of GA biosynthesis.
日本植物生理学会の論文