Document Detail


Mesocarp cell turgor in Vitis vinifera L. berries throughout development and its relation to firmness, growth, and the onset of ripening.
MedLine Citation:
PMID:  18797922     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Vitis vinifera L. berries are non-climacteric fruit that exhibit a double sigmoid growth pattern and dynamic changes in gene expression, cell metabolism, and water relations at the onset of ripening. The cell-pressure probe was utilized to examine the relationships of turgor pressure (P) in mesocarp cells to growth, sugar accumulation, and fruit softening during development. In replications utilizing three different varieties, mesocarp cell P demonstrated a consistent pattern of a relative mid-range P early in development, followed by an increase to a maximum of about 0.35 MPa, and a subsequent rapid decline before ripening to less than 0.1 MPa. Fruit "apparent elastic modulus" (E, units of MPa), was introduced as a standard measure to describe ripening-related softening. E changed dynamically and synchronously with P during development and in response to water deficits for fruit grown in greenhouse and field conditions. Thus, E and P were positively and linearly related. Sugar accumulation did not increase significantly until P had declined to less than 0.1 MPa. The results suggest that P is an important determinant of fruit softening and that P decreases in conjunction with many of the physiological and gene expression changes that are known to occur at the onset of ripening.
Authors:
Tyler R Thomas; Ken A Shackel; Mark A Matthews
Publication Detail:
Type:  Journal Article     Date:  2008-09-17
Journal Detail:
Title:  Planta     Volume:  228     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-10     Completed Date:  2009-03-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1067-76     Citation Subset:  IM    
Affiliation:
Department of Viticulture and Enology, University of California, Davis, CA 95616, USA.
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Carbohydrate Metabolism
Elastic Modulus
Fruit / anatomy & histology,  cytology*,  growth & development
Time Factors
Vitis / anatomy & histology,  cytology*,  growth & development

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