Light and temperature affect postharvest colour development in Cripps Pink apples.
Marais, E., Jacobs, G. and Holcroft, D. M.
ISHS Acta Horticulturae 553: 91-94.
2001
บทคัดย่อ
Light and temperature affect postharvest colour development in
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<p>Since postharvest irradiation can
enhance blush development in apples, this system was used to study the effects
of the interaction between light and temperature on anthocyanin synthesis. Apple
(cv. Cripps Pink) fruits harvested from two growing regions in South Africa,
Grabouw and Ceres, were subjected to 120 h of irradiation at 6 deg C or 20 deg
C following 0, 2 or 5 days at -0.5 deg C. Fruits harvested from Grabouw were
consistently more red when irradiated at 6 deg C than 20 deg C, although there
was a slight improvement in colour after storage at -0.5 deg C for 5 days prior
to irradiation. Fruits harvested from Ceres and irradiated immediately showed
increased anthocyanin synthesis at 6 deg C compared to 20 deg C. The difference
between the temperatures was no longer significant after fruits had been stored
for 5 days prior to irradiation. In a second experiment, fruits were stored for
20 days at -0.5 deg C prior to irradiation at either 6 deg C or 20 deg /6 deg C
(day/night). The fluctuating temperature resulted in better colour and higher
anthocyanin concentrations in fruits from both areas. The hue angle of well-coloured
'Cripps' Pink' apples irradiated at 37 deg C increased from 29 deg to 48 deg
and the anthocyanin concentration decreased from 740 to 284 ug/g after 144 h of
irradiation. Fruits held at 37 deg C in the dark did not show any loss of red
colour or anthocyanin degradation. </p>
<p> </p>
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