Agriculture Reference
In-Depth Information
Malik and Singh (2005) worked on the effect of prestorage applica-
tion on improving fruit quality of mango ('Kensington Pride'). Fruits were
dipped for 6 min in aqueous solution containing different concentrations
of various polyamines including putrescine (1 mM), spermidine (0.5 mM)
and spermine (0.01 mM) with 0.01% Tween-20 as surfactant. Treated
fruits were stored at 13 ±1 °C and 85 ± 5% RH for 4 weeks. Following
storage, fruits were allowed to ripen at a temperature of 22 ± 1 °C. Fruit
firmness was significantly reduced in untreated fruits whereas PA treated
fruits exhibit a significantly higher firmness up to 28 days after storage and
spermine was found more effective.
It has been reported that under chilling condition, changes in cell mem-
brane lipid from a liquid-crystalline to solid-gel state are induced in plant
tissue, which leads to increase in membrane permeability as wall as elec-
trolyte leakage of ions (Gomez-Galindo et al., 2004). Polyamines when
applied exogenously they seem to induce cold acclimation, which would
lead to maintenance of membrane fluidity at low temperatures and could
be responsible for reducing electrolyte leakage and skin browning. These
polyamines mainly protect the membrane lipid from being conversion in
physical state, and as it has antioxidant property, it prevents lipid peroxida-
tion and thus severity of chilling injury (Barman et al., 2011a). Mirdeghan
et al. (2007) studied the effect of prestorage application of polyamines by
pressure infiltration on reducing chilling injury in pomegranate fruit. Fruits
were treated with 1 mM putrescine, 1 mM spermidine or with distilled wa-
ter, which serves as control. Treatments were performed by low pressure
infiltration method by applying pressure 0.05 bars for 4 min as well as im-
mersion method with polyamine and Tween-20 (2 g/L) as surfactant. Fol-
lowing treatments they were stored at 2 °C and 90% RH. Before analysis of
the samples they were exposed to 20 °C temperature for 3 days. The results
found that control fruits reached the highest percentage of skin browning
without significance differences between them. However, the application
of putrescine of spermidine led to significant reduction in skin browning. It
also maintains the functional and sensory qualities during low temperature
storage of pomegranate fruits (Barman et al., 2011b).
16.7 1-METHYLCYCLOPROPENE
1-methylcyclopropene (1-MCP) is a synthetic cyclic olefin that inhibits
ethylene by blocking access to the ethylene-binding receptor (Sisler and
