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Ultrastructural and histochemical analysis reveals ethylene-induced responses underlying reduced peel collapse in detached citrus fruit.
MedLine Citation:
PMID:  21509903     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Fruits from many citrus cultivars develop depressed areas in the flavedo (outer part of the peel) and albedo (inner part) following detachment. Although ultrastructural analysis may provide important information about multiple plant responses to stresses and external stimuli at the cell and tissue levels, and despite the proved efficacy of ethylene in reducing peel damage in citrus fruit, cytological responses of this horticultural crop to protective ethylene concentrations have not yet been reported. We show that applying high ethylene levels (2 μL L(-1) for 14 days) causes sublethal stress as it favored the alteration of cuticle, vacuole, middle lamella and primary wall, especially in the albedo cells, but reduced peel collapse in detached mature "Navelate" oranges (C. sinensis, L. Osbeck) held under nonstressful environmental conditions (22°C and 90-95% RH). Ethylene did not induce relevant changes in lignification but favored the deposition of pectic exudates and the release of sugars from degradation of cell polysaccharides including starch, cellulose, and pectins. In contrast, inhibiting ethylene perception by applying 1-methylcyclopropene (1-MCP) reduced these ethylene-related responses and favored degradation of cell membranes and peel damage. The overall results reflect that mature oranges tolerate high ethylene levels that might favor the activation of defense responses involving oxidative-stress related mechanisms and recycling of nutrients and carbon supply to enable cells to sustain respiration and cope with carbon deprivation stress caused by detachment. Microsc. Res. Tech. 2011. © 2011 Wiley-Liss, Inc.
Authors:
Jacques F Cajuste; Francisco J García-Breijo; José Reig-Armiñana; María T Lafuente
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-20
Journal Detail:
Title:  Microscopy research and technique     Volume:  -     ISSN:  1097-0029     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9203012     Medline TA:  Microsc Res Tech     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Wiley-Liss, Inc.
Affiliation:
Instituto de Agroquímica y Tecnología de Alimentos, C.S.I.C., Apartado de Correos 73, 46100 Burjassot, Valencia, Spain; Colegio Postgraduados, Campus Montecillo, Carretera a México-Texcoco, km 35-5, 56230, México.
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