Nouveauté

Nemadex Alain Bouquet

This variety results from the crossbreeding of a Vitis vinifera (Cabernet-Sauvignon x Alicante Henri Bouschet) and Muscadinia rotundifolia (NC 184-4) F1 hybrid (VMH 8771) and 140 Ruggeri.

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Genetic origin

The genetic origin of the variety is also indicated when known thanks to hybridiser data or genetic analysis either published or obtained by the teams at INRAE in Montpellier (UMR AGAP) and at the Vassal-Montpellier Grapevine Biological Resources Centre (CRB-Vigne).

This variety results from the crossbreeding of a Vitis vinifera (Cabernet-Sauvignon x Alicante Henri Bouschet) and Muscadinia rotundifolia (NC 184-4) F1 hybrid (VMH 8771) and 140 Ruggeri.

Breeder/breeder and year obtained

The name of the breeder and/or selector is indicated, as is the year in which the variety was bred.

INRA

Estimated surface area of the French vineyard grafted with this rootstock and main regions of use

The figures are estimated based on the computerised vineyard register and bibliographical data.

10 ha .

Evolution of cultivated areas in France

The figures provided are taken from vineyard land registers (IVCC, ONIVIT, ONIVINS), general agricultural censuses (SCEES-INSEE) and the current computerised vineyard register (DGDDI, FAM). Regional vine planting data is available on the following site: https://visionet.franceagrimer.fr/Pages/DonneesInteractivesDocs.aspx?sousmenu=observatoire%20de%20la%20viticulture.

Year
ha

2015

4.8

Eléments de description ampélographique

Only the main ampelographic elements enabling the rootstocks to be characterised and identified are provided. They are described according to the ampelographic descriptor code recognised by the International Organisation of Vine and Wine (OIV), the International Union for the Protection of New Varieties of Plants (UPOV), the Community Plant Variety Office (OCVV) and Bioversity International (for more information, see the "Ampelographic glossary" menu). The photographs of buds, flowers and adult leaves were taken indoors by the INRAE team at Domaine de Vassal from material sampled from the ampelographic collections of the Vassal-Montpellier Grapevine Biological Resources Centre. Note: the scale of the photos is not the same for the three organs shown. The photos of buds have been reduced (x 0.5 approx.), as have those of the adult leaves (x 0.25 approx.), while those of the flowers have been enlarged (x 4 approx.).

The identification is based on:
-the tip of the young shoot that is open with a low density of prostrate hairs,
- the green young leaves with bronze spots, 
- the shoots with no erect or prostrate hairs,
- the small to medium, kidney-shaped, entire adult leaves, with an open or very open U-shaped petiole sinus, short teeth compared to their width at the base with convex sides, a smooth, not very thick leaf blade, slightly curly on the edges and involute around the petiole sinus lobes, a weak anthocyanin coloration of veins, and on the lower side of the leaves, a very low density of erect hairs and no prostrate hairs,
- the hermaphrodite flowers,
- the very small, round-shaped berries, with a blue black skin, a slightly colored pulp with a foxy taste,
- the dark brown woody shoots.

Genetic profile

The genetic profile of the variety is provided for the 9 microsatellite markers (or SSR markers) selected under the European programme GrapeGen06 (http://www.eu-vitis.de/index.php) and by the OIV. The absolute size values of the alleles may vary slightly from one laboratory to another, but the relative differences between the two alleles of one single microsatellite are constant. The genetic analyses were conducted by the INRAE Montpellier team (UMR AGAP) and the IFV’s Plant Material Centre.

Microsatellite VVS2 VVMD5 VVMD7 VVMD27 VRZAG62 VRZAG79 VVMD25 VVMD28 VVMD32

Allele 1

135

238

231

236

214

258

236

0

249

Allele 2

149

243

245

238

214

260

238

0

251

Resistance to soil pests

The degree of tolerance to the root form of phylloxera and resistance to nematodes (Meloidogyne hapla, Meloidogyne incognita and Meloidogyne arenaria), to Agrobacterium vitis (the bacterium responsible for burls) and to certain soil fungi is stated on the basis of observations or bibliographical data.

Nemadex Alain Bouquet is very highly tolerant to the root form of phylloxera. It is also partially resistant to Xiphinema index nematodes, which delays the infection and slows down the fanleaf virus contamination in the vineyards.

Aptitudes for vegetative multiplication

The level of wood production by the rootstock strains is stated (source: ENTAV-ONIVINS survey of grapevine nurseries, April 2001). The suitability for cleaning, disbudding, cutting and grafting is also specified. Further details are provided if the rootstock variety requires special precautions during grafting and layering.

Nemadex Alain Bouquet has a bushy and erect bearing, with short internodes. Its wood production is consequently very low (10 to 30 000 m/ha). Nemadex Alain Bouquet has moderate to good cutting and grafting capacities.

Clonal selection in France

All certified clones are listed, as are the surface areas of the mother vine of clones that are propagated. For the moment, clonal selection of rootstock is conducted solely for sanitary purposes.

In France, the only certified Nemadex Alain Bouquet clone carries the number 1163 and it is multiplied on 3 has 41 ares of mother vines producing certified material, in 2017.

Datas are extracted from: Les chiffres de la pépinière viticole, 2017, Datas and assesment of FranceAgriMer, may 2018.

Adaptation to the environment

This paragraph provides information on the behaviour of the rootstock variety in relation to the structure, texture and composition of the soil, its mineral content and the soil’s pH. It also states the behaviour of the rootstock when faced with an excess or lack of water during the vegetative period. Chlorosis Iron chlorosis is related to problems of iron assimilation due to low iron content and/or high carbonate content in soil. Total calcium carbonate content alone gives only a partial idea of the chlorosis-inducing power of the soil. The active calcium carbonate content corresponds to the percentage of carbonate present in the fine fraction of the soil (clays, fine silts). Depending on the characteristics of the parent rock and its geological origin, this represents a variable percentage of the total calcium carbonate. The chlorotic power index (IPC) is a calculation which takes into account the active calcium carbonate content and the easily extractible iron content of the soil. These three values provide an insight into the risk of chlorosis and allow growers to choose the most suitable rootstock variety accordingly. Tylosis and apoplexy These apoplexy phenomena are linked to problems of water circulation through the plant when evapotranspiration is high (dry wind following heavy rainfall in the summer season) and the absorption of water through the roots is limited. In this case, the high pressure in the vessels causes air bubbles (cavitation) and tyloses (invagination of the membrane of neighbouring cells in the vessels) to form, which causes a slowing of sap circulation and water stress in the leaves.

Nemadex Alain Bouquet resists up to 15% of "active" limestone and an ICP of 30. Its resistance to iron chlorosis is thus low to moderate. This rootstock is sensitive to temporary water excess during the spring and it is not very resistant to drought.

Interaction with the graft and production objectives

The rootstock may interact with the characteristics of the graft in terms of precocity of the vegetative cycle and the growth and development of the branches, as well as yield factors (fertility and berry size). In some cases, the risks of incompatibility or poor affinity of the rootstock variety with a graft variety are specified.

Nemadex Alain Bouquet confers a rather low vigor and induces moderate yields.

Bibliographic references

The rootstock may interact with the characteristics of the graft in terms of precocity of the vegetative cycle and the growth and development of the branches, as well as yield factors (fertility and berry size). In some cases, the risks of incompatibility or poor affinity of the rootstock variety with a graft variety are specified.

- Documentary collections of the Centre de Ressources Biologiques de la Vigne de Vassal-Montpellier, INRAE - Montpellier SupAgro, Marseillan, France.
- Nemadex Alain Bouquet root stock technical data sheet, INRA, 2013, France.