Seedless Grapevine Plant Named ‘ARD51’

Classification: The present invention relates to a new Vitis vinifera Grapevine.

Variety denomination: The new Grapevine has a varietal denomination ‘ARD51’.

BACKGROUND OF THE INVENTION

A breeding program was initiated during the late 90's near Bakersfield in San Joaquin Valley of Central California. In 2018, during this breeding program, a new variety of Vitis vinifera was created by deliberate cross breeding of two parent plants by emasculation of the pollen bearing organ of the female and introducing pollen from another male origin. The female parent of the new variety was 35-33+6, which is a white, crunchy and slightly juicy variety (non-patented in the United States). The male parent (i.e. the pollen parent) of the new variety was 30A-11+3, a red, crispy and juicy variety (non-patented in the United States).

TABLE 1

‘ARD51’ compared with parents & closely related variety:

‘ARD51’ 35−33+6 30A−11+3 Flame

Brix 21 17 18 16-20

Texture Crunchy & Crunchy Crispy Crispy

juicy

Berry Broad Obtuse Broad Globose

shape ellipsoid ovoid ellipsoid

The parentage of the new variety can be summarized as follows: 35-33+6 X 30A-11+3

An artificial pollination was created, and the result was an embryo which possessed unique genetic qualities. The rudiments resulting from the above pollination were embryo rescued.

In 2019 the plant was transplanted to Bakersfield in San Joaquin Valley of Central California.

It was found that the new grapevine of the present invention possesses the following combination of characteristics:

•

• (a) Forms attractive crunchy and juicy seedless berries with a red skin coloration; in lax density and large clusters which display a natural sweet flavor, • (b) Commonly bears fruit during the month of July in the San Joaquin Valley of Central California, U.S.A., and • (c) Bears fruit that is firm and is well amenable for storage, handling, and shipping. • (d) Produces 44 bunches per vine, and an average of about 2 bunches per shoot, at a total of 51 lbs. fruit per vine.

The new variety during observation to date has displayed no visible disease, and has displayed an ability to well resist cold, drought, heat; but sensitive to direct exposure to sun and wind. The fruit of the new variety has been found to display excellent handling and shipping qualities combined with desirable dessert eating qualities.

The new variety of the present invention has been found to undergo asexual propagation beginning in 2020 near Bakersfield in the San Joaquin Valley of Central California, U.S.A. by bud grafting on mature Thompson Seedless rootstock (non-patented in the United States). Such asexual propagation has been conducted thereafter in successive years to date and has shown that the characteristics of the new variety are strictly transmissible from one generation to another. Accordingly, the new variety undergoes asexual propagation in a true to type manner.

SUMMARY OF THE INVENTION

The new variety ‘ARD51’ is a red, naturally sweet seedless grape variety with high production, e.g., about 44 bunches per vine, and an average of about 2 bunches per shoot.

Asexual reproduction by micro propagation of the new variety as performed near Bakersfield, California, U.S.A., shows that the forgoing and other distinguishing characteristics come true to form and are established and transmitted through succeeding propagations.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying photographic illustration shows typical five-year-old specimens of the new variety, vegetatively propagated, in color as nearly true as it is reasonably possible to make in a color illustration of this character. Colors in the photograph may differ from the color values cited in the detailed botanical description below, which accurately describes the colors of the new Grapevine.

The drawing shows leaves, stems, tendrils and grapes of ‘ARD51’.

DETAILED BOTANICAL DESCRIPTION

The chart used in the identification of colors is The R.H.S. Colour Chart of The ROYAL HORTICULTURAL SOCIETY (3 rd Edition). The description is based on the observation of plants growing on ‘Thompson Seedless’ rootstock outdoors near San Joaquin Valley of Central California, U.S.A.

TABLE 2

VINE CHARACTERISTICS:

vigor Vigorous upright shoots

productive capacity Bearing at a natural, average

capacity. Spur pruning.

trunk Strong and developed.

Diameter is 2.4 inches at 4.5 inches

above ground.

Rough with a fibrous, shaggy exterior.

Light maple brown coloring greyed

orange 177 B

• Date of bud burst in Bakersfield California: March 4 th .

TABLE 3

YOUNG SHOOT CHARACTERISTICS:

Openness of tip Wide open

Density of prostrate hairs on tip Dense

Anthocyanin coloration of prostrate None

hairs on tip

Density of erect hairs on tip Medium

TABLE 4

YOUNG LEAF CHARACTERISTICS:

Color of upper side of blade Yellow green 146 B

Color of lower side of blade Yellow green 146 C

Density of erect hairs between main Dense

veins on upper side of blade

Density of erect hairs between main Dense

veins on lower side of blade

Density of prostrate hairs on main Dense

veins on upper side of blade

Density of prostrate hairs on main Dense

veins on lower side of blade

TABLE 5

SHOOT CHARACTERISTICS:

Attitude (before tying) Semi-erect

Color of dorsal side of internodes Yellow Green 144 A

Color of ventral side of internodes Yellow Green 144 A

Color of dorsal side of nodes Yellow Green 144 B

Color of ventral side of nodes Yellow Green 144 B

Density of erect hairs on internodes Absent or very sparse

Density of prostrate hairs on Absent or very sparse

internodes

Length of tendrils 7.5 inches

Diameter of tendrils 0.09 inches

Color of tendrils Yellow green 144 A

Number of tendrils at bloom 4

Positioning of first flowering and The first bunch is in

fruiting node the 3 rd node

Inflorescence number per flowering 2

shoot

TABLE 6

FLOWER CHARACTERISTICS:

Reproductive organs Fully developed stamens and

fully developed gynoecium

Flower length 0.3 inches

Flower diameter 0.2 inches

Pistil length 0.14 inches

Pistil color Yellow green 144 A

Pollen Amount Rich

Pollen color Yellow 10 A

Stamen color Yellow green 145 C

Stamen length 0.19 inches

Number of stamen 6

..

• First bloom in Bakersfield, California: April 23 rd . • Date of full bloom in Bakersfield, California: May 1 st .

TABLE 7

MATURE LEAF CHARACTERISTICS:

Size of blade 6.5 inches × 6.5 inches

Shape of blade Circular

Base descriptors Pentagonal

Leaf margin Serrate

Leaf apex Acute

Blistering of upper side of blade Absent or very sparse

Depth of upper lateral sinuses Shallow

Number of lobes Five

(Only varieties with lobed leaves) Open

Arrangement of lobes of upper

lateral sinuses

Arrangement of lobes of petiole Half open

sinus

Length of teeth 0.27 inches

Ratio length/width of teeth Small

Shape of teeth Both sides concave

Density of prostrate hairs between Absent or very sparse

main veins on lower side of blade

Density of erect hairs on main veins Absent or very sparse

on lower side of blade

Density of erect hairs between the Absent or very sparse

main veins on upper side of blade

Density of prostrate hairs on main Absent or very sparse

veins on upper side of blade

Length of petiole compared to length Moderately shorter

of middle vein

Top side color Green 137 A

Bottom side color Green 138 B

Texture of upper side of blade Smooth

Texture of lower side of blade Smooth

Vein color on upper blade Yellow Green 145 A

Anthocyanin coloration of main veins Red 53 A

on upper side of blade

Vein color on lower blade Yellow green 145 C

Venation pattern for upper blade Netlike venation

Venation patten for lower blade Netlike venation

Petiole length 2.5 inches

Petiole diameter 0.1 inches

Petiole color Red 53 A

Petiole texture Smooth

• Date of beginning of berry ripening in Bakersfield California: June 2 nd .

TABLE 8

BUNCH CHARACTERISTICS:

Size (peduncle excluded) Large

Density of berries on bunch Lax

Bunch length 9.5 inches

Bunch diameter 4.8 inches

Length of peduncle of primary bunch 0.84 inches

Diameter of peduncle of primary 0.11 inches

bunch

Peduncle of primary bunch color Yellow green 144 B

Peduncle texture Smooth

Bunches per vine 44

Average bunch weight 1.16 lbs

TABLE 9

BERRY CHARACTERISTICS:

Size Large

Length 1.4 inches

Weight 0.35 oz

Diameter 0.09 inches

Shape Broad ellipsoid

Color of skin (without bloom) Red 45 D

Flesh color Yellow green 145 D

Brix 21

Titratable acidity percentage 0.33%

Juice 4.09 pH

Ease of detachment from pedicel Moderately easy

Thickness of skin Thin

Anthocyanin coloration of flesh None

Firmness of flesh Moderately firm

Particular flavor Naturally sweet

Formation of seeds Rudimentary

Berries per bunch 53

Juiciness of the berry flesh Juicy

TABLE 10

PEDICEL CHARACTERISTICS:

Length 0.51 inches

Diameter 0.13 inches

Color Green 143 C

Pedicel texture Rough

TABLE 11

WOODY SHOOT CHARACTERISTICS:

Woody shoot texture Rough

Woody shoot color Greyed orange 165 B

Woody shoot length 274 inches

Diameter 0.4 inches

Internode length 2.8 inches

• Market use of observed plants: Fresh market. • Age and growing conditions: Six years growing under Y system in South Joaquin Valley (hot, dry summers). • Shipping characteristics: (E.g. number of days fruit has been stored under specific conditions): Fruit was in cold storage. Stored in poly bags inside polystyrene boxes with sulfur pads. After 30 Days rachises were 90% green; 5% berry shattering; no berry wrinkling or cracks were apparent. • DNA profile: To further characterize the new variety DNA was extracted from plant samples and a DNA profile was obtained at California Seed & Plant Lab, California USA using base pairs for 10 standard microsatellite DNA markers. The data is presented hereafter.

TABLE 12

DNA profile for ARD51

Microsatellite

DNA Marker Allele Sizes in Base Pairs

M 1 234 236

M 2 247 249

M 3 179 194

M 4 210 216

M 5 271 271

M 6 131 145

M 7 189 189

M 8 255 257

M 9 212 214

M 10 247 247

The ‘ARD51’ variety has not been observed under all possible environmental conditions to date. Accordingly, it is possible that the phenotypic expression may vary somewhat with changes in light intensity and duration, cultural practices, and other environmental conditions.

Additional information relating to plant and fruit disease and pest resistance or susceptibility has not been observed to date. Specification of the plant hardiness zone and the heat/cold resistance has not been observed to date.