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ANTI-SAP
CHEMICALS AND HOT WATER QUARANTINE TREATMENT EFFECTS ON STORAGE LIFE AND
FRUIT QUALITY OF MANGO CV. SAMAR BAHISHT CHAUNSA
ABDUL JABBAR, AMAN
ULLAH MALIK *, MEHDI MAQBOOL, MUHAMMAD AMIN, MUNAZZA SAEED AND
RABIA HAMEED
Abstract: This study
aimed at testing the combined effects of anti-sap chemicals and hot
water quarantine treatment (HWQT: 48°C-60min) on a commercial mango cv.
Samar Bahisht (S.B.) Chaunsa, as potential protocol for export to China.
The physiologically mature mango fruit were harvested along with 4-5 cm
pedicel. After de-stemming, the fruits were treated with potential
anti-sap chemicals: calcium hydroxide [Ca(OH)2], potassium
aluminium sulphate [KAl(SO4)2.12(H2O)],
Tween-80 [C64H124O26]. After chemical
application, half of the fruit lot was subjected to HWQT as per
protocol, while the remaining half was kept without HWQT. The fruit
after treatments were air dried, packed in cardboard boxes and stored
(13±1°C, 85% RH) for 21 days. Sapburn injuries were scored after 24, 48,
72 hrs and 21days of storage. After storage the fruit were allowed to
ripe at room temperature and assessed for physical disorders and disease
incidence. Fruit were also analysed for firmness, peel colour, sugars,
titratable acidity, total carotenoids, ascorbic acid contents and
organoleptic characteristics (pulp colour, texture, taste, aroma,
flavour). Sapburn injury score showed significant differences for
chemicals and chemical-HWQT interactions. De-stemming under lime [Ca
(OH)2] followed by HWQT showed least sapburn injury with more
firm fruit. HW treated fruit showed significantly lower anthracnose
disease incidence (1.68 vs 2.42), while higher sugars (18.32 vs 14.56%)
with more pulp browning (0.74 vs 0.48) and higher total carotenoids
(67.0 vs 56.1µg/g) compared to without HWQT. Organoleptic evaluation
revealed smoother pulp texture in fruit without HWQT. It was concluded
that mango desapping with 1.0% lime solution, followed by HWQT
(48°C-60min), did not significantly impair quality during 21 days of
storage, beside controlling sapburn injury and meeting market access
requirement. However, in view of the exhibited heat induced effects,
more studies are needed on HWQT effects on various maturity levels and
improving post-storage colour development in mango cv. S.B. Chaunsa,
for its export to China, by sea or road, using refrigerated containers.
Postharvest Research and Training Centre, Institute of Horticultural
Sciences,
University of Agriculture, Faisalabad, Pakistan
*Corresponding
author’s e-mail: malikaman1@yahoo.com
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