52 grapevine varieties assessed for 5 years under the Bordeaux climate

09.03.2015

One of the objectives of WP1 is to explore the genetic diversity of grape physiology and berry composition in the context of adaptation to climate change. The goal is to counterbalance the present trend observed in many wine regions, i.e. increase in alcohol content, decrease in acidity, and loss of aroma ascribed to a ripening period that presently occurs in warmer seasons than before. This can be made by shifting the phenology to later dates and by identifying genotypes with lower sugar and higher acid contents, as well as the molecular basis of these traits.

To this end, 52 varieties all grafted on the same rootstock and planted on an homogeneous soil in random blocks (10 plants/blocks, 5 blocks per variety) have been assessed for 5 years under the Bordeaux climate. The data show a consistent behavior along the years and have allowed to rank the varieties for precocity of burdburst, flowering and veraison. Depending on the stage, there was a difference of 20 to 40 days between the different varieties studied. Principal component analysis of berries also allowed to distinguish 3 groups of varieties with large berry size, high sugar and high acid content respectively. This material provides a background that may be exploited for further molecular analysis aiming to identify key players controlling those traits.

In task 1.2, several non-destructive phenotyping tools giving a precise account of plant and berry status have been validated. Concerning the canopy, five Multiplex indices have been monitored with Multiplex A: foliar density (NFI); leaf chlorophyll content (SFR_R); leaf flavonols content (FLAV); nitrogen balance index (NBI_R); nitrogen uptake (BINBI). They were able to identify varietal differences or differences due to blocks. Concerning berries and clusters, the measurements made were validated by comparison with chemical measurements. The Multiplex gives a reliable account of anthocyanin content for red berries, and of chlorophyll content on white berries. The chlorophyll content of white berries could also be correlated with Brix, total acidity, pH  and technological maturity

 
 
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Innovine is a European collaborative project that has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement n° 311775.
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