数種の観賞植物に対するジベレリンの影響-続-
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概要
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Following our previous work, successive experi-ments were performed to study the effects of gib-berellin on several flower crops, mainly on flower hastening, from the end of 1957 to the beginning of 1958. Gibberellin was applied to the plants as an aqueous solution and the concentrations of spray-ed solution were 25, 50 and 100 ppm. Potted plants in glasshouses were used for this experiment. 1. Gibberellin effects on flower hastening and flower-stalk elongation of cyclamen (Cyclamen Persicum MILL.) and that on vegetative growth stimu-lation of petunia (Petunia hybrida VILM.) were all apparent. These effects were already found in our previous experiment. As it seems that flowering of treated cyclamen was about 20_??_25 days earlier than control plant in this experiment, the effect of flower hastening on cyclamen was more remark-able than in the previous case, probably because of the applications of earlier spraying and more con-centrated solution. In petunia, its vegetative growth was not only stimulated, but flowering was also hastened. 2. Concerning the experiments with the mono-cotyledonous and bulbous plants, there were seen also flower hastening effects on freesia (Freesia refracta KLATT.), trumpet narcissus (Narcissus Pseudo-Narcissus L.) and Dutch iris(Iris hollandica HORT.), and the greatest extent of flower hastening on each plant was about 3 to 7 days. But there were hardly any effects on Easter lily (Lilium longi florum THUNB. var. giganteum HORT). As a matter of fact, flower hastening effect in the early spray-ing was more remarkable than that in the later spraying in case of freesia (Fujinomine) and Dutch iris. In regard to the plant height increase or flower-stem elongation of these plants, gibberellin had little or no effect. 3. Flowering of pansy (Viola tricolor L.) was hastened. Furthermore, plant height and peduncle length were markedly increased. 4. Flowering of Primula malacoides FRANCH. was also hastened. In addition to this effect, length of main Sower-stalk was remarkably increased and petiole length was also increased slightly, but these influences did not seem to cause an unfavour-able result to the market value of potted plants. 5. Young plant growth of calceolarria (Calceolarria rugosa RUIZ et PAV.) was stimulated by the application of gibberellin. Flowering of Amuradonis (Adonis amurensis REGEL et RADDE.) was hastened and vegetative growth was strikingly increased afterward. When the pruned branches of hydrangea (Hydrangea macrophylla SER.) were dipped into glass bottles containing gibberellin solution, bud, sprouting and leaf expansion were hastened by such gibberellin treatment. 6. There were no effects of injury or damage on the germination of pollen grains taken from treated plants of cyclamen and Primula malacoides FRANCH.
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