New Zealand Journal of Crop and Horticultural Science abstracts
Modelling of colour development in the fruit of Actinidia chinensis
‘Hort16A’
P. E. H. Minchin
The Horticulture and Food Research
Institute of New Zealand Ltd
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
email: pminchin@hortresearch.co.nz
N. De Silva
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
W. P. Snelgar
The Horticulture and Food Research
Institute of New Zealand Ltd
Te Puke Research Centre
No. 1 Rd, RD2
Te Puke, New Zealand
A. C. Richardson
The Horticulture and Food Research
Institute of New Zealand Ltd
Kerikeri Research Centre
P.O. Box 23
Kerikeri, New Zealand
T. G. Thorp
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
Abstract Colour development in fruit of Actinidia
chinensis var. chinensis ‘Hort16A’, the new yellow-fleshed cultivar
produced commercially in New Zealand, was monitored during three seasons in
four kiwifruit-producing districts of New Zealand. Fruit were destructively
harvested to measure flesh colour between flowering and harvest. Flesh colour
of the outer pericarp remained green (115° hue angle) until c. 140 days
after mid bloom (DAMB). Then flesh colour changed following a sigmoid like
pattern to a yellow hue (97-100° hue angle) by 220 DAMB. The change in
hue angle is shown to be well represented by the complementary log-log function.
The scale parameter describing this transition was independent of site and
season, whereas timing of the transition between the upper and lower asymptote
was dependant on both site and season because of a small dependence on the
average of the maximum temperature over the period of 100-150 DAMB. Each degree
C increase in maximum temperature during the 100-150 DAMB delays colour development
by c. 3 days. Distribution of individual hue angles about the mean value
was best described by a constrained beta distribution defined by two parameters,
which in turn uniquely specify the average hue angle and variance of the
population at that time. For hue angles near the mid range, which occurs
before harvest maturity, this beta distribution is well approximated by a
Normal distribution with the same mean and variance, but at harvest maturity
a beta distribution is a better description. When the average hue angle is
103°, the difference between the 97.5 percentile on the Normal approximation
and the beta distribution is c. 0.6. This difference rises rapidly as the
hue angle drops further.
Keywords Actinidia chinensis; fruit maturation;
colour development; modelling
H02064 Received 2 September 2002; accepted 19 November 2002; published
26 March 2003
New Zealand Journal of Crop and Horticultural Science, 2003, Vol. 31:
41-53
0014-0671/03/3101-0041 $7.00 © The Royal Society of New Zealand
2003
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