Grézot 1
Name of vine variety in France (and common name)
Grézot 1 (G 1)
Breeder and year of obtention
Victor Grézot, 1894
Genetic origin
Based on genetic analyses carried out in Montpellier, this variety is derived from a 1202 Couderc seedling (Vitis rupestris - Vitis vinifera cv. Mourvèdre N).
Evolution of areas under rootstock nurseries
1945 1965 1975 1985 2015
Rank 33 18 20 22 31
ha 0.4 12 17 3 0
Estimated surface area of French vineyards grafted with this rootstock and the main areas of use
10 ha.
Ampelographic description
Identification signs include:
- the tip of the young shoot is half-open with an absence to very slight coat of flat-lying hairs,
- young leaves are slightly bronze; the shoots have an absence of flat-lying and upright hairs,
- adult leaves are kideny-shaped, upturned with an open petiolar sinus; teeth with one side slightly convex and the other side slightly concave,
- female flowers,
- very small berries, round-shaped with a bluish black skin.
Genetic profile
Allel 1 135 250 239 236 188 256 236 241 237
Allel 2 149 265 249 262 191 262 262 243 237
Resistance to soil parasites
G 1 displays moderate resistance to phylloxera. This root stock must therfore be used under unfavorable conditions for this pest.
Adapt to environment
G 1 is susceptible to chlorosis and resists just up to 6% of active limestone. It is likewise susceptible to drought. This rootstock easily absorbs magnesium and is quite resistant to magnesium deficiency. It does however have difficulty in absorbing potassium in the soil. G 1 is likewise susceptible to chlorides and must be avoided when there is a risk of salinity.
Interaction with grafts and production objectives
G 1 generally displays a good affinity to grafts. Moderate to high vigor. This rootstock produces good results with Chasselas B.
Aptitudes for plant propagation
This rootstock is a low to moderate wood producer (25 000 to 40 000 m/ha) but it displays good propagation by cuttings and grafting capacity.
Resistance to aerial parasites
G 1 displays moderate resistance to gallicolae phylloxera and good resistance to downy mildew.
Clonal selection in France
There are no approved clones for this variety at the present time.