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

结实部位和3朵花授粉或不授粉组合对柿无核落果或单性结实的影响CVS。为了阐明单性结实与果实间同化物竞争的关系，对扶余和平成进行了调查。1.已授粉和未授粉花的座果率均以上部最高，下部最低。2.所有已授粉的单性结实果实均在地上部。3.有花授粉和未授粉的单性结实果实比结实果数多的果实在同一枝条上的座果率较高。4.所有未授粉的花朵均在地上部着生单性结实果实，特别是在上部，降低了地上部的长度。5.不同果位的无核果实生长差异显著，许多小果有脱落的趋势。6.单性结实的座果率因果位和地上部是否授粉而异，‘扶余’和‘平生’单性结实的变异规律非常相似。结果表明：1)扶余单性结实的一个显性因素比遗传更明显；2)扶余与平生单性结实的遗传特性无显著差异；3)无核果实落果是果实间竞争所致，单性结实是竞争果实库力相对优势所致。

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.