บทคัดย่องานวิจัย

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Fruit growth characteristics and chronological development of calyx-end splitting in Pacific RoseTM apple.

Opara, L. U.; Tadesse, T.;

Journal of American Pomological Society Year: 2000 Vol: 54 Issue: 3 Pages: 153-159 Ref: 18 ref.

2000

บทคัดย่อ

Fruit growth characteristics and chronological development of calyx-end splitting in Pacific RoseTM apple.

Calyx-end splitting (CES) is a preharvest physiological disorder, which downgrades the quality of Pacific Rose apples, but its causes are not known. Fruit growth characteristics and incidence of calyx-end splitting were monitored on Pacific Rose apples. The onset of splitting incidence was at 20 weeks after full bloom (WAFB) and increased progressively with maturity. Fruit growth (diameter, length, and volume) followed an exponential growth pattern. The absolute growth rates (AGR) of diameter and length fluctuated, but showed a declining trend over time, whereas the volume AGR increased until 17 WAFB and declined thereafter. Fruit diameter, length, and volume relative growth rates (RGR) declined exponentially over time. Fruit shape (length/diameter ratio) was characterized by 3 distinct phases, corresponding to rapid decline (until 18 WAFB), stagnation (18-21 WAFB), and slow rise during the last few weeks before commercial harvest. The onset of CES was preceded by a period of maximum AGR of frui

t volume during which fruit shape changed very little. The growth curves of fruit diameter, length and volume respectively, however, did not provide any distinct period with regard to the onset of fruit splitting in the orchard.