エンドウの分枝性に関する研究-2-

概要

論文の詳細を見る
During 1961 and 1962, a series of experiments was conducted to study the effects of plant growth regulators and pinching on the branching in Pisum sativum L.The varieties used were GW (Pisum sativum L. var. arvense) and Alaska and Usui (Pisum sativum L. var. hortense). The seeds were sown in the field in October, 1961 (Experiment I.) and in April and May, 1962 (Experiment II, III). The plants were grown under natural daylength or under artificial 8-hour short-day condition. Pinching was realized by removing the terminal growing point of main shoot at the stage of 5_??_10 leaves. And at this stage, once or twice at one-week intervals, some plants were sprayed with water solutions of plant growth regulators(10ppm of gibberellin and 10 or 50 ppm of 2, 3, 5-triiodobenzoic acid). The solutions were applied whole in plant sprays. As the wetting agent was utilized 0.15% of carbowax (M.W.: 1500).The results are summarized in Tables 1_??_3 and Figs. 12 for the Experiment I, in Tables 4_??_5 and Figs. 3_??_5 for the Experiment II, and in Tables 6_??_9 and Figs. 6-8 for the Experiment III.In all the varieties tested, 2, 3, 5-triiodobenzoic acid (TIBA) increased significantly the number of primary branches and further in GW and Alaska accelerated the development of secondary branches. As the consequence, the total number of branches in these two varieties are always greater in the TIBA-treated lots, while in Usui, a variety that develops more dominantly secondary branches, a decrease of the total number of branches was observed in the lots treated with TIBA.The response of pea to gibberellin with reference to the branching varied among the varieties and according to the growing season. In the experiment from October to June, gibberellin decreased the effect of pinching in all the varieties, but in the experiment from May to June the spray of gibberellin nulified the pinching effect in Alaska and Usui but not in GW.Pinching accelerated the development of both primary and secondary branches for all the varieties tested. This trend was remarkably accentuated under long-day condition, though in Usui which is able to produce branches on higher nodes of main shoot, pinching inevitably resulted in a decrease of the total number of branches.TIBA, though in a lesser degree than gibberellin, encourages the growth of individual branches developed, resulting in an increase of total branch length per plant. TIBA and gibberellin exert a remakable influence on the distribution of branches on the main shoot: TIBA favours the production of branches on lower nodes and arrests the branching on higher ones, while on the contrary gibberellin stimulates the branching on higher nodes, restricting that on lower ones.These features lead us to visualize a similarity between the effect of daylength and that of the plant growth regulators in such a respect that gibberellin is comparable in its effect to long-day and TIBA to short-day.As for the effect of TIBA on the number of flowers per plant, no consistent trend was presented. for all the varieties tested. In GW, branching of which is remarkably stimulated by TIBA, the number of flowers is likewise significantly increased.In the plants treated with gibberellin, a decrease in the number of flowers was generally observed.
園芸学会の論文

エンドウの分枝性に関する研究-2-

スポンサーリンク

概要

著者

関連論文

スポンサーリンク