Involvement of pectin methyl-esterase during the ripening of grape berries: partial cDNA isolation, transcript expression and changes in the degree of methyl-esterification of cell wall pectins

Grape berries ( Vitis vinifera L., cv Ugni blanc) were harvested at 12 different weeks of development in 1996 and 1997. Ripening was induced at veraison, the crucial stage of berry softening, and was followed by a rapid accumulation of glucose and fructose and an increase of pH. Total RNAs, crude pr...

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Bibliographic Details
Published in:Phytochemistry (Oxford) 2001-11, Vol.58 (5), p.693-701
Main Authors: Barnavon, Laurent, Doco, Thierry, Terrier, Nancy, Ageorges, Agnès, Romieu, Charles, Pellerin, Patrice
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Amino Acid Sequence
Biological and medical sciences
Carboxylic Ester Hydrolases - genetics
Carboxylic Ester Hydrolases - metabolism
Cell wall
Cell Wall - chemistry
Development
DNA, Complementary - isolation & purification
DNA, Complementary - metabolism
Economic plant physiology
Esterification
Fructification and ripening
Fructification, ripening. Postharvest physiology
Fundamental and applied biological sciences. Psychology
Gene Expression Profiling - methods
Grape berry
Growth and development
Life Sciences
Molecular Sequence Data
Pectin methyl-esterase
Pectins - analysis
Pectins - metabolism
Phytopathology and phytopharmacy
Plant physiology and development
RNA, Messenger - metabolism
Sequence Homology, Amino Acid
softening
Transcription, Genetic
Vegetal Biology
Vegetative and sexual reproduction, floral biology, fructification
Vitis - enzymology
Vitis - growth & development
Vitis - metabolism
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Summary:Grape berries ( Vitis vinifera L., cv Ugni blanc) were harvested at 12 different weeks of development in 1996 and 1997. Ripening was induced at veraison, the crucial stage of berry softening, and was followed by a rapid accumulation of glucose and fructose and an increase of pH. Total RNAs, crude proteins and cell wall material were isolated from each developmental stage. A partial length cDNA ( pme1, accession number AF159122, GenBank TM) encoding a pectin methyl-esterase (PME, EC 3.1.1.11) was cloned by RT–PCR with degenerate primers. Northern blots revealed that mRNAs coding for PME accumulate from one week before the onset of ripening until complete maturity, indicating that this transcript represents an early marker of veraison and could be involved in berry softening. However, PME activity was detected during all developmental stages. Total activity per berry increased, whereas “specific” activity, on a fresh weight basis, decreased during development. The amount of cell wall material (per berry and per g of berry) followed the same pattern as that of PME activity (total and “specific” respectively), indicating they were tightly correlated and that PME levels varied very little in the cell walls. Nevertheless, the degree of methyl-esterification of insoluble pectins decreased throughout the development from 68% in green stages to less than 20% for the ripe berries, and this observation is consistent with the induction of PME mRNAs during ripening. Relations between transcript expression, PME activity, the DE of insoluble pectic polysaccharides and their involvement in grape berry ripening are discussed. Mechanism of pectin demethylesterification by pectin-methylesterase.
ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(01)00274-6