Journal of the Japanese Society for Horticultural Science
Online ISSN : 1880-358X
Print ISSN : 0013-7626
ISSN-L : 0013-7626
Relation of Harvest Date and Skin Color to Fruit Quality of Loquat 'Mogi' during Maturation
Koji UchinoYoshinobu TatsudaKazuyoshi Sakoda
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1994 Volume 63 Issue 3 Pages 479-484

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Abstract

Maturing loquat (Eriobotrya japonica Lindl. cv. Mogi) fruit were harvested on 11, 18, and 25 May 1992 and grouped into four to nine classes based on the skin color measured as the Hunter "a" value. The relationship between the skin color and fruit quality, such as sugar contents, organic acid contents, and flesh firmness was investigated.
1. The soluble solids content increased and the titratable acidity (TA) decreased with maturation. TA in the fruit whose "a" value was more than 4, decreased concurrent with a delay in harvest.
2. Glucose and fructose contents in the flesh increased as the color intensity deepened with each harvest date. Sucrose content of the fruit harvested on 11 May increased with maturation, whereas, it decreased in fruit harvested on 25 May.
3. Malic acid content in the flesh decreased as the "a" value increased on every harvest date. Citric acid content was higher in immature fruit than it was in mature fruit, whereas, succinic and fumaric acid contents rose with maturation.
4. The flesh firmness gradually decreased until the "a" value reached 6-8, it then increased slightly. The flesh of the over-ripe fruit was more elastic than that of eating-ripe ones.

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