Cell wall modification in 1-methylcyclopropene-treated post-climacteric fresh-cut and intact papaya
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Date
2011Author
Ergun, Muharrem
Karakurt, Yasar
Huber, Donald J
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Papaya is a climacteric fruit in which ripening
is greatly regulated by ethylene often associated with stress
responses such as wounding. The changes in cell wall
compositions in papaya fruit at an advanced stage of ripening
under stress conditions including chilling temperature
of 5C and wounding employed as fresh-cut and how
these changes were affected by an ethylene action inhibitor
of 1-methylcyclopropopene (1-MCP) were examined in
the study. The recovery of ethanol-insoluble solids, total
soluble sugars, water-soluble polyuronides, neutral hemicelluloses,
and neutral sugars of rhamnose, arabinose,
mannose and glucose were not affected by 1-MCP or freshcut
processing. The fresh-cut processing, however, caused
a higher loss of total polyuronides and the neutral sugar
galactose while increasing the recovery of chelator-soluble
polyuronides. Few significant differences due to 1-MCP
application were recorded in the recoveries of alkali-soluble
polyuronides, hemicellulosic polyuronides extracted
with 4% KOH, and the neutral sugar xylose. Modifications
of cell wall polyuronides and hemicelluloses in ripe freshcut
papaya fruit exhibited mostly similar patterns to those
in intact ripe papaya fruit under the chilling temperature of
5C while minimally affected by 1-MCP.
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