Madeleine royale B
Name of vine variety in France
Madeleine royale
Origin
This table grape vine variety was obtained by Moreau Robert in 1845 in the Loire Valley region. Based on genetic analyses carried out in  Montpellier, Madeleine royale B is derived from the crossbreeding of Frankenthal N and Pinot.
Synonymy
No synonym is officially recognized in France for this variety, nor in other countries in the European Union.
Regulations
In France, Madeleine royale B is officially listed in the "Catalogue of vine varieties".

This vine variety is likewise listed in the Catalogue of Great Britain.
Use
Table grape vine variety
Evolution of area under vines in France
2016
ha 1.9
Description
Identification signs include:
- the tip of the young shoots has a thick coat of flat-lying hairs,
- yellow young leaves,
- orbicular adult leaves, 5 lobes with moderately deep lateral sinuses, a petiolar sinus with overlapping lobes and a U-shaped base; small ashort teeth with straight or convex sides, an absence of vein pigmentation, strongly bubbled jagged leaf blade, sometimes cupped and the underside with a sparse coat of flat-lying and upright hairs,
- round-shaped or short elliptical-shaped berries.
Genetic profile
Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32
Allel 1 149 225 243 178 188 246 240 216 251
Allel 2 153 234 247 186 194 260 248 243 271
Phenology
Bud burst: same as Chasselas.
Grape maturity: early, 1 and 1/2 weeks before Chasselas.
Suitability for cultivation and agronomic production
Madeleine royale B is moderately vigorous, grows semi-erect and can be short-pruned.
Sensitivity to diseases and pests
Madeleine royale B is very susceptible to grey rot.
Technological potential
The grape clusters are moderate size and compact. The berries have a simple flavor and are likewise moderate size with thin skin and juicy pulp.  Bad storage and transportation capacity.
Clonal selection in France
There are no approved clones for this vine variety at the present time.
Bibliographic references
- Catalogue des variétés et clones de vigne cultivés en France. Collectif, 2007, Ed. IFV, Le Grau-du-Roi.
- Documentation interne du Domaine de Vassal. 1949-2011, INRA, Marseillan-plage.
- Dictionnaire encyclopédique des cépages. P. Galet, 2000, Ed. Hachette, Paris.
- Ampélographie. P. Viala et V. Vermorel, 1902-1910, Ed. Masson, Paris.