STUDIES ON JUNE DROP AND ASSIMILATE TRANSLOCATION IN KAKI (Diospyros kaki L.f.)

以柿（Diospyros kaki L.f.）为试材，研究了果位和裸枝3花授粉与不授粉组合对柿无核落果和单性结实的影响。栽培变种为了阐明单性结实与果实间竞争同化物的关系，对Fuyu和Hiralanenashi进行了研究。1.授粉花和未授粉花的坐果率均是上部最高，基部最低。2.单性结实的果实在所有授粉的枝的上部位置。3.在有花授粉和无花授粉的同一枝上，多籽果实比单性结实果实座果率高。4.单性结实的果实坐在所有花的拍摄非授粉，特别是在上面的位置，减少长度的拍摄。5.不同果位的无核果实生长差异显著，许多较小的果实有皱缩的趋势。6.单性结实在果位和有无授粉果上存在差异，且‘富玉’和‘平田稔氏’单性结实的变异模式非常相似。结果表明：（1）“富玉”单性结实的显性因素是显性的，而不是遗传的;（2）“富玉”与“平田稔”单性结实的遗传特性无显著差异;（3）无核落果是由果实间的竞争引起的，单性结实是竞争果实库强度的相对优势所致。

Influence of fruit position and the combination of 3 flowers with or without pollination in a baring shoot on seedless fruit drop or parthenocarpic fruit set of kaki (Diospyros kaki L.f.) cvs. Fuyu and Hiralanenashi was investigated to clarify the relation between parthenocarpy and competition for assimitates among fruits. 1. Fruit set of pollinated and non-pollinated flowers was the highest at upper position and lowest at basal one in a shoot. 2. Parthenocarpic fruit of upper position in the shoot of all pollinated. 3. More seeded fruits had a tendency to set higher than parthenocarpic fruits in the same shoot with flowers pollinates and non-pollinated. 4. Parthenocarpic fruit set in the shoot of all flowers non-pollinates, especially at the upper position, decreasing length of shoot. 5. These was significant difference in seedless fruit growth among the fruit positions, and many of the smaller fruits tended to abscise. 6. Parthenocarpic fruit set varied in fruit position and presence of pollinated fruit in a shoot, and the variation patterns of parthenocarpy were very similar in 'Fuyu' and 'Hiratanenashi'. We concluded that 1) a dominant factor of parthenocarpy in 'Fuyu' was more evidential than hereditary, 2) these was no remarkable difference in hereditary characteristic of parthenocarpy between 'Fuyu' and 'Hiratanenashi' and 3) fruit drop of seedless fruit was induced by the competition among fruit, and the parthenocarpic fruit set was resulting from relative advantage in sink strength among competed fruits.