Journal of the Japanese Society for Horticultural Science
Online ISSN : 1880-358X
Print ISSN : 0013-7626
ISSN-L : 0013-7626
Effects of Light Intensity and Humidity around Clusters on the Formation of Surface Wax and the Resistance to Berry Splitting in‘Delaware’Grapes
Hiroshi YAMAMURARyuji NAITOHisashi TAMURA
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JOURNAL FREE ACCESS

1986 Volume 55 Issue 2 Pages 138-144

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Abstract

Clusters of‘Delaware’grapes were shaded or exposed to high moisture by covering them with bags of black cheesecloth or polyethylene film in the early, middle and late stages of fruit growth. Effects of these treatments on the formation of surface wax and the resistance to berry splitting were examined.
1. The amount of surface wax and waxy bloom was not significantly decreased by cluster shading at any stage of fruit growth. High moisture treatment at the late stage significantly decreased these factors. However, these treatments did not have a significant effect on berry splitting.
2. Cluster shading at the late stage increased the thickness of sub-epidermal cell walls, and tended to decrease berry splitting. The high moisture treatments at the early and middle stages increased the critical turgor pressure of berries, markedly promoted the development of sub-epidermal cell walls, pedicels and their lenticels and reduced the frequency of berry splitting.

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