Volume 54 Number 3 Article 28 Pages: 153-159
Year 2000 Month 7
Title: Fruit Growth Characteristics and Chronological Development of Calyx-end Splitting in Pacific RoseTM Apple
Authors: L.U. Opara and T. Tadesse
Citation
Abstract:
Calyx-end splitting (CES) is a preharvest physiological disorder, which downgrades the quality of
Pacific Rose™ apple fruit, but its causes are not known.
Fruit growth characteristics and incidence of
calyx-end splitting were monitored on Pacific Rose™ apple.
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 snowed 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 three
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 fruit 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.
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