温州蜜柑の隔年結果防止に関する研究 (第1報) : 花芽の分化時期について

概要

論文の詳細を見る
Recently the alternate bearing tendency has become so detrimental that the investigations for controlling these tendencies are of economical importance for Unshu orange growers in Japan. Flowers of Unshu orange develop from apical meristem, terminal or in the axiles of current shoot. Rare blossom-bud formation on the branches, that nourished the fruits during the previous season, is the cause of low yield, following the abundant fruit production of the so-called on year. These tendencies stimulate interest in the study of blossom-bud formation in the first place. In this report, the time of blossom-bud differentiation of Unshu orange is disputed in various references. The determination of the time of blossom-bud formation by microtechnique is fundamentally an anatomical study, undertaken as a necessary prerequisite to an understanding of the physiology of Unshu orange trees and their responses to the environmental factors. 1. Blossom-bud differentiation in Unshu trees appeared in materials collected March 22, 1956. The second node buds are collected successively for histological study and for the purpose of eliminating the vegetative buds in observation only those taken from the branches whose apical and the third node buds flowered in May are examined. 2. Examination of buds collected from the branches, defoliated on the successive dates beginning on September 20, 1956, failed to show any difference in the time of differentiation. Blossom-bud formation takes place just the same time with the control branches. 3. It is shown with Unshu, Natsudaidai and Navel orange that the formative sign of blossom-bud differentiation is observed only after the meristematic activity has become evident. Histological study of the bud of Unshu orange showed that the first evidence of growth, manifested with daughter cell formation, appeared in materials collected March 22, 1956 and in materials collected March 23, 1957. In Navel orange, the blossom-bud differentiation appeared in the materials collected January 21 and the meristematic activity appeared in the materials collected January 10. The earlier blossom-bud differentiation of Navel is preceded by the earlier begining of the meristematic activity as compared with Unshu orange. 4. It may be concluded that the blossom-bud differentiation of Unshu orange takes place with resumption of meristematic activity, provided with the elevated nutritional level after a long pause of growth during winter.
園芸学会の論文

温州蜜柑の隔年結果防止に関する研究 (第1報) : 花芽の分化時期について

スポンサーリンク

概要

著者

関連論文

スポンサーリンク