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Pinot Noir berry transcriptome during ripening.

ABSTRACT: Global gene expression analysis of grapevine cv. Pinot Noir berries during development and ripening. Time-course comparison of samples collected at three developmental stages (stages 33, 34 and 36 according to the modified E-L system, ref: Coombe BG, Aust J Grape Wine Res 1995, 1: 104-110) during three seasons (2003, 2005 and 2006). Data for each of the three seasons were normalized independently within each season, using gcRMA. PLEXdb (http://www.plexdb.org) has submitted this series at GEO on behalf of the original contributor, Stefania Pilati. The equivalent experiment is VV11 at PLEXdb.

ORGANISM(S): Vitis vinifera

PROVIDER: GSE31674 | GEO | 2011/08/27

SECONDARY ACCESSION(S): PRJNA145369

REPOSITORIES: GEO

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Pinot Noir berry transcriptome during ripening.

Project description:Global gene expression analysis of grapevine cv. Pinot Noir berries during development and ripening. Time-course comparison of samples collected at three developmental stages (stages 33, 34 and 36 according to the modified E-L system, ref: Coombe BG, Aust J Grape Wine Res 1995, 1: 104-110) during three seasons (2003, 2005 and 2006). Data for each of the three seasons were normalized independently within each season, using gcRMA. PLEXdb (http://www.plexdb.org) has submitted this series at GEO on behalf of the original contributor, Stefania Pilati. The equivalent experiment is VV11 at PLEXdb. year: 2003 - developmental stage: UD:0000034 33E-L (3-replications); year: 2003 - developmental stage: UD:0000035 34E-L (3-replications); year: 2003 - developmental stage: UD:0000037 36E-L (3-replications); year: 2005 - developmental stage: UD:0000034 33E-L (3-replications); year: 2005 - developmental stage: UD:0000035 34E-L (3-replications); year: 2005 - developmental stage: UD:0000037 36E-L (3-replications); year: 2006 - developmental stage: UD:0000034 33E-L (3-replications); year: 2006 - developmental stage: UD:0000035 34E-L (3-replications); year: 2006 - developmental stage: UD:0000037 36E-L (3-replications)

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Project description:The impact of yield on fruit and wine quality has been studied extensively; vine response to increased yield is well known, but responsible mechanisms – including the regulation of pathways responsible for color, aroma and mouthfeel – have not been characterized at the level of genetic regulation. To examine the impact of crop load on transcriptomic and metabolomic changes during grape berry maturation vines from two cluster thinning treatments (50% or 75% of clusters removed following fruit set) were compared to control vines (no cluster thinning). Treatments were applied to mature Pinot noir grapevines over three consecutive vintages. Agronomic parameters, including yield per vine and the yield to pruning weight ratio, as well as fruit and wine composition, were determined at harvest. Fruit transcriptomic and metabolomic changes were measured in berry samples collected from each treatment at 7 to 10 day intervals from fruit set to harvest. The patterns of berry development by weight, sugar accumulation, and malic acid degradation indicated that vines responded differentially to crop load reduction by accelerating berry maturation progress. RNA-Seq analysis, and untargeted GC-MS and UHPLC-QTOF-MS -based metabolomic approaches were used. The indication of the acceleration of maturation transcriptional programs and of metabolite accumulation in the treated vines was suggested by multivariate analyses. To identify the transcriptional key triggers of this response we applied a two-regression step statistical approach which identified genes modulated over development dependent on the crop load. Comparing vintages we were able to estimate the environmental influence on the crop load treatments among years. The application of this multifaceted approach allowed the construction of robust models describing the impact of crop load on the genetic regulation of grape maturation.

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