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  1. Tropical Plant Biology
  2. Tropical Plant Biology : Volume 3
  3. Tropical Plant Biology : Volume 3, Issue 2, June 2010
  4. Papaya Fruit Softening: Role of Hydrolases
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Tropical Plant Biology : Volume 10
Tropical Plant Biology : Volume 9
Tropical Plant Biology : Volume 8
Tropical Plant Biology : Volume 7
Tropical Plant Biology : Volume 6
Tropical Plant Biology : Volume 5
Tropical Plant Biology : Volume 4
Tropical Plant Biology : Volume 3
Tropical Plant Biology : Volume 3, Issue 4, December 2010
Tropical Plant Biology : Volume 3, Issue 3, September 2010
Tropical Plant Biology : Volume 3, Issue 2, June 2010
Sequencing and Utilization of the Gossypium Genomes
The Biotechnology Roadmap for Sugarcane Improvement
Highly Efficient, 5′-Sequence-Specific Transgene Silencing in a Complex Polyploid
Papaya Fruit Softening: Role of Hydrolases
The Complement of Soluble Sugars in the Saccharum Complex
Tropical Plant Biology : Volume 3, Issue 1, March 2010
Tropical Plant Biology : Volume 2
Tropical Plant Biology : Volume 1

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Papaya Fruit Softening: Role of Hydrolases

Content Provider SpringerLink
Author Thumdee, Siwaporn Manei, Ashariya Chen, Nancy J. Paull, Robert E.
Copyright Year 2010
Abstract Papaya (Carica papaya L.) cultivars show a wide variation in fruit softening rates, a character that determines fruit quality and shelf life, and thought to be the result of cell wall degradation. The activity of pectin methylesterase, β-galactosidase, endoglucanase, endoxylanase and xylosidase were correlated with normal softening, though no relationship was found between polygalacturonase activity and softening. When softening was modified by 1-MCP treatment, a delay occurred before the normal increase in activities of all cell wall activities except endoxylanase which was completely suppressed. Significant cell wall mass loss occurred in the mesocarp tissue during normal softening, but did not occur to the same extent following 1-MCP treatment. During normal softening, pectin polysaccharides and loosely bound matrix polysaccharides were solubilized and the release of xylosyl and galactosyl residues occurred. Cell wall changes in galactosyl residues after 1-MCP treatment were comparable to those of untreated fruit but 1-MCP treated fruit did not soften completely. The changes in the cell wall fractions containing xylosyl residues in 1-MCP treated fruit showed less solubilization and a higher association of xylosyl residues with the pectic polysaccharides. The results indicated that normal modification of cell wall xylosyl components during ripening did not occur following 1-MCP treatment at the color-break stage, this was associated with the failure of these fruit to fully soften and a selective suppression of endoxylanase activity. The results support a role for endoxylanase in normal papaya fruit softening and its suppression by 1-MCP lead to a failure to fully soften. Normal papaya ripening related softening was dependent upon the expression and activity of endoglucanase, β-galactosidase and endoxylanase.
Starting Page 98
Ending Page 109
Page Count 12
File Format PDF
ISSN 19359756
Journal Tropical Plant Biology
Volume Number 3
Issue Number 2
e-ISSN 19359764
Language English
Publisher Springer-Verlag
Publisher Date 2010-03-30
Publisher Place New York
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Fruit ripening Softening Wall degradation Cell wall hydrolases 1-MCP Cell wall fractionation Transgenics Plant Ecology Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Sciences
Content Type Text
Resource Type Article
Subject Genetics Plant Science
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