ウンシュウミカンの花器及び幼果の発達に及ぼす開花期前後の温度の影響

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The effects of high temperature (30°C-35°C) before and after flowering on the development of flower and young fruit in Citrus unshiu Marc. were investigated, and the occurrence of fruit of abnormal shape in plastic greenhouses was histologically studied.1. Following high temperature before flowering, the development of petal, filament and pistil was repressed in size and weight, and the shape of ovary became markedly slender. Such ovaries showed a marked development of the wall of their pedicel end owing to a greater number of cell layers and larger cell size.2. The reaction of the ovary wall to high temperature was most sensitive in the pedicel end, less in the stylar end, and least in the equatorial part of the ovaries. Occurrence of the abnormal fruit was promoted by high temperature at the stage of vigorous growts of the pedicel end.3. Relative growth rate of the ovary wall was higher in the pedicel and stylar ends before flowering. For a while after flowering, however, it was higher in the equatorial part and later in the equatorial part and the stylar end.
園藝學會の論文