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Potted Cordyline terminalis L. `Prins Albert', a foliage plant, was treated with foliar sprays or growth medium drenches of paclobutrazol for plant growth control. Paclobutrazol effectively reduced shoot length measured 4 months following application, the drench being more effective than the spray. Application of paclobutrazol at 200 ppm by either method gave a desirable compact and marketable product. Drench applications at 1000 ppm promoted side-shoot formation. Leaf morphology was altered from an elongated to a more oval form as the paclobutrazol concentration increased, but leaf count was not affected by paclobutrazol, except for the highest drench concentration, which reduced leaf count by 10%. Chemical name used: β– [(4-chlorophenyl)methyl] –α– (1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).
Explant growth and shoot multiplication of Spathiphyllum and Syngonium were compared on agar-solidified medium and interfacial membrane rafts floating on liquid medium. After 25 d of culture, greater shoot multiplication and fresh mass gain were achieved by plant material grown on rafts. Shoot multiplication of Spathiphyllum and Syngonium on membrane rafts reached a maximum at 25 d, whereas the fresh mass increased throughout the culture period (40 d). The number of shoots of Spathiphyllum and Syngonium material grown on membrane rafts remained constant between 25 and 40 d of culture. The plants grown on membrane rafts also developed more roots.
Cotyledonary explants of melon (Cucumis melo L. cv. Galia) regenerate primordia and buds in vitro induced by benzyladenine. The anti-gibberellin ancymidol can stimulate the rate of regeneration on melon explants in the presence of benzyladenine. Concentrations of benzyladenine plus ancymidol that are individually ineffective can act synergistically to stimulate regeneration. Gibberellic acid reduces the rate of regeneration induced by benzyladenine or benzyladenine plus ancymidol. Chemical names used: N-(phenylmethyl)-1H-purine-6-amine (benzyladenine); alpha-cyclopropyl-alpha-(4-methoxy-phenyl)-5-pyrimidine methanol (ancymidol).