Journal of Taiwan Agricultural Research

Author:A-Shiarn Hwang*, Kuang-Liang Huang and Shin-Hsuan Hsu

Abstract:

    ‘Ruby’ grapefruit (Citrus paradisi Macf.) were covered with black paper bags in late May or early June (early bagging) or early July (late bagging), and changes in the peel and flesh color were measured by spectrophotometer in regular intervals till harvest in late November. Bagging increased chroma and lightness but decreased hue angle gradually on peel, thus resulting in a light reddish orange color during maturation period, while control fruits were bright yellow. The most intense color on peel of bagged fruit occurred in late October. The peel color of early-bagged fruit was redder (smaller hue angle) than that of late-bagged fruit. Compared to controls, bagging only slightly enhanced flesh color during maturation period, and there was no significant different between the two different bagging treatments at harvest. Bagging had limited effect on fruit quality.

Key words:Grapefruit, Peel color, Flesh color, Bagging, Fruit quality

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