VDG004

Grapevine

Denomination: 'VDG004'
Previously Proposed Denomination: 'PxREN1.015'
Botanical Name: Vitis vinifera
Applicant/Holder: Vineland Research and Innovations Centre Inc.
4890 Victoria Avenue North
P.O. Box 4000
Vineland Station, Ontario
L0R 2E0
Canada
Breeder: Daryl Somers, Fenwick, Ontario
Rumen Conev, St. Catharines, Ontario
Application Date: 2013-06-06
Application Number: 13-8055
Protective direction granted: 2013-06-06
Protective direction withdrawn: 2014-04-17
Grant of Rights Date: 2016-02-03
Certificate Number: 5177
Grant of Rights Termination Date: 2041-02-03

Variety Description

Variety used for comparison: 'Pixie'

Summary: The prostrate hairs on the tip of the young shoot of 'VDG004' are of medium density while the prostrate hairs of 'Pixie' are very dense. The prostrate hairs between the main veins on the lower side of the young leaf blade of 'VDG004' are absent or very sparse whereas the prostrate hairs of 'Pixie' are very dense. The mature leaf blade of 'VDG004' is circular in shape with three lobes whereas the leaf blade of 'Pixie' is pentagonal in shape with five lobes. The upper side of the mature leaf blade of 'VDG004' has a weak to medium degree of blistering whereas the leaf blade of 'Pixie' has strong blistering. The upper lateral sinuses of the mature leaf blade of 'VDG004' are absent or very shallow whereas the upper lateral sinuses of 'Pixie' are medium to deep. The teeth of the margin of the mature leaf blade of 'VDG004' are shaped with both sides convex whereas the teeth of 'Pixie' are shaped with a mixture of both sides straight and both sides convex. The density of the bunch of berries produced by 'VDG004' is lax to medium dense whereas the bunch of berries produced by 'Pixie' is dense. The berries of 'VDG004' are very small whereas the berries of 'Pixie' are small. The colour of the skin of the berry is violet blue for 'VDG004' whereas the skin of 'Pixie' is black. The berry of 'VDG004' is more difficult to detach from the pedicel and has a thinner skin and softer flesh than the berry of 'Pixie'. The berry of 'VDG004' has no particular flavour whereas the berry of 'Pixie' has an herbaceous flavour. The formation of seeds is rudimentary for 'VDG004' whereas the formation is complete for 'Pixie'. The plants of 'VDG004' carry the REN1 gene for resistance to powdery mildew (Erysiphe necator) whereas the plants of 'Pixie' do not.

Description:

YOUNG SHOOT TIP: closed, medium density of prostrate hairs, absent or very weak intensity of anthocyanin colouration of prostrate hairs
SHOOT TENDRIL: very short, very few, decline quickly
SHOOT INTERNODE: green dorsal and ventral side
SHOOT NODE: green dorsal side, green with small amount of red on ventral side
WOODY SHOOT: light brown (RHS 174B)

FLOWER: fully developed stamens and fully developed gynoecium

YOUNG LEAF BLADE: upper side is brown green (RHS 137B), absent or very sparse prostrate hairs between main veins on lower side
MATURE LEAF BLADE: very small to small, circular shape, weak to medium degree of blistering of upper side, three lobes, absent or very shallow upper lateral sinuses, arrangement of lobes of upper lateral sinuses is not touching, arrangement of lobes of petiole sinus is strongly overlapped, proportion of main veins on upper side with anthocyanin colouration is very low, absent or very sparse prostrate hairs between main veins on lower side, absent or very sparse erect hairs on main veins on lower side, length of petiole is much shorter than length of middle vein
TEETH ALONG MARGIN OF MATURE LEAF BLADE: short, short length in relation to width, shape is both sides convex

BERRY BUNCH: very small, lax to medium density, peduncle of primary bunch is short to medium length
BERRY: very small, globose shape, difficult to detach from pedicel, no particular flavour, seed formation is rudimentary
BERRY SKIN: violet blue (RHS N92B), thin
BERRY FLESH: soft or slightly firm, absent or very weak intensity of anthocyanin colouration

DISEASE RESISTANCE: contains powdery mildew (Erysiphe necator) resistance gene REN1

Origin & Breeding History: 'VDG004' (experimental designation 'PxREN1.015') originated from a controlled hybridization between the dwarf variety 'Pixie', as the female parent, and variety 'Kishmish Vatkana', as the male parent. The original cross was conducted at the Vineland Research and Innovations Centre in Vineland Station, Ontario on November 22, 2010. 'VDG004' was selected on May 7, 2012 for its dwarfism, true hybridity, attractive ornamental display, and confirmed possession of the powdery mildew (Erysiphe necator) resistance gene REN1.

Tests & Trials: The comparative trial of 'VDG004' was conducted in a greenhouse during 2013 at the Vineland Research and Innovations Centre in Vineland Station, Ontario. There were 10 plants each of the candidate and reference variety grown on their own roots. Each plant was obtained from single node soft stem cuttings taken in 2012, rooted and planted into black, plastic, 25 cm diameter pots. This dwarf grape variety has indeterminant growth when grown under greenhouse conditions; therefore, seasonal growth characteristics were not assessed. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.


Comparison table for 'VDG004' with reference variety 'Pixie'

Colour of skin of berry (RHS)

  'VDG004' 'Pixie'
outer side N92B N186A

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VDG004
Grapevine: 'VDG004' (left) with reference variety 'Pixie' (right)

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VDG004
Grapevine: 'VDG004' (left) with reference variety 'Pixie' (right)

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VDG004
Grapevine: 'VDG004' (right) with reference variety 'Pixie' (left)

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