บทคัดย่องานวิจัย

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Preliminary study on the relationship between fluorescence and pitting of citrus.

Dou HuaTing; Ismail, M. A.; Petracek, P. D.;

Proceedings of the Florida State Horticultural Society Year: 1999, publ. 2000 Issue: No. 112 Pages: 163-166 Ref: 9 ref.

2000

บทคัดย่อ

Preliminary study on the relationship between fluorescence and pitting of citrus.

Five studies have been performed this year (1999) on white 'Marsh' grapefruit and 'Fallglo' tangerines [mandarins] to establish the relationship between fruit fluorescence and peel pitting. Fruit fluorescence was measured before harvesting, at harvesting, and after packing. Pitting was assessed after storage at 21 deg C and 93% RH for up to 21 days. The results of these studies showed that greenish mature white 'Marsh' grapefruit usually had higher fruit fluorescence (average minimal fluorescence, Fo:120; average maximal fluorescence, Fm:750) than yellowish mature grapefruit (average Fo:25; average Fm:125). In contrast, the latter fruit pitted more (20%) than the former. Shellac wax resulted in relatively low fruit fluorescence, whereas fruit coated with carnauba wax had high fluorescence; percentage pitting was highest in fruits coated with shellac wax (28.3%, compared with 1.2% for carnauba wax). The highest fruit fluorescence was found in non-waxed fruits. There was a positive relationship be

tween fluorescence at harvest (both Fo, and Fm) and pitting of grapefruit in one out of three studies. In 'Fallglo' tangerines, no relationship was found between fruit fluorescence and pitting incidence. Fruit fluorescence measurements on-tree before and after colour-break were similar in magnitude to those taken one day after fruit packing. Fluorescence may be a useful predictor of postharvest pitting when used in conjunction with other factors such as fruit maturity and turgidity.