Vol. 70 No: 6

Title:
Synthetic Cytokinins Control Persimmon Fruit Shape, Size and Quality

Authors:
A. ITAI, K. TANABE, F. TAMURA, S. SUSAKI, K. YONEMORI and A. SUGIURA

pp: 867-874

Abstract:
The effect of three synthetic cytokinins on fruit development of persimmon (Diospyros kaki L.) ‘Hiratanenashi’ was studied by spraying flowers or young fruitlets with 10 or 100 ppm 4PU-30 and TDZ, and 100 or 1000 ppm BA. The most effective for promoting fruit growth was 4PU-30 at 100 ppm, followed by TDZ at 100 ppm and 4PU-30 at 10 ppm. BA at 100 or 1000 ppm and TDZ at 10 ppm had no effect on the fruit enlargement. At 100 ppm, 4PU-30 produced flatter fruit, by promoting transverse growth. Both 4PU-30 and TDZ retarded ripening, as evidenced by delayed chlorophyll degradation and low sugar accumulation. Comparison between prebloom and postbloom applications on cvs Tonewase and Saijo revealed that the former treatment produced flatter, heavier fruit than did the latter. The treated fruit also contained less sugars, especially the reducing sugars, than did the control fruits, indicating that the ripening process was also retarded in these cultivars.

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