Grapevine Named ‘SV36-21-170’

Latin name of the genus and species of the plant claimed: The plant claimed relates to a new and distinct variety of Vitis vinifera. Variety denomination: The plant claimed shall be known as ‘SV36-21-170’. STATEMENT OF ANY FEDERALLY-SPONSORED RESEARCH AND DEVELOPMENT The present invention is not subject of Federally-sponsored research or development.

BACKGROUND OF THE INVENTION

The present invention comprises a new and distinct cultivar of grapevine botanically known as Vitis spp. and hereinafter referred to as grapevine named ‘SV36-21-170’. As used herein, ‘grapevine’ refers to all plant parts including, vines, canes, tendrils, leaves, fruit and roots of ‘SV36-21-170’. Grapevine named ‘36-21-170’ is the result of an effort to produce a new, large berried, late ripening red seedless table grape. This new cultivar originated from a cross conducted in May 2015 near McFarland, California, between female grapevine plant selection ‘SV13-2-138’ (unpatented) and male grapevine plant ‘SV32-49-285’ (unpatented). Resultant ovules from the cross were harvested 42 days after pollination and cultured on ‘McCown's Woody Plant Medium’. Subsequently, the resultant embryonic plants were cultured in the same medium in the laboratory under twelve hours of light from standard fluorescent lamps at 27° C. The seedlings from this effort were transplanted to the greenhouse in November of 2015 and grown at 27° C. with 12 hours illumination under high pressure sodium vapor lamps. The seedling population was planted in the field in the spring of 2016 near Delano, California. The new grapevine was selected from this seedling population on Sep. 15, 2017. It was then propagated by cuttings and bench grafted to ‘Freedom’ (unpatented) rootstock in 2018 at a nursery near Delano, California. The present invention has been found to retain its distinctive characteristics through three successive asexual propagations. Grapevine named ‘SV36-21-170’ differs from its female parent grapevine ‘SV13-2-138’ (unpatented) in that ‘SV36-21-170’ has perfect flowers and red berries while ‘SV13-2-138’ has pistillate flowers and white berries. Grapevine named ‘SV36-21-170’ differs from its male parent grapevine ‘SV32-49-285’ (unpatented) in that ‘SV36-21-170’ has neutral flavored, red berries while ‘SV32-49-285’ has red berries with muscat flavor. Grapevine ‘SV36-21-170’ is most similar to commercially available ‘Scarlet Royal’ (U.S. Plant Pat. No. 16,229) in that both cultivars have large, red, seedless berries. Grapevine named ‘SV36-21-170’ differs from ‘Scarlet Royal’ (U.S. Plant Pat. No. 16,229) by ripening its fruit in late September in the Delano, California area as opposed to late August for ‘Scarlet Royal’. Further, ‘SV36-21-170’ has no astringency at full ripeness over 20 brix while ‘Scarlet Royal’ (U.S. Plant Pat. No. 16,229) is typically astringent at full ripeness over 20 brix.

SUMMARY OF THE INVENTION

The following are the most outstanding and distinguishing characteristics of the ripe fruit of this new variety when grown under normal horticultural practices near McFarland, California: a. Fruit clusters with large, red, seedless berries. b. Very crisp berry texture. c. Highly vigorous growth with high fruitfulness.

BRIEF DESCRIPTION OF THE DRAWINGS

This new grapevine is illustrated by the accompanying photographs which show fruit clusters, leaves, canes and tendrils. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. The photographs were taken from the original seedling vine in 2017 and from a vine grafted to ‘Freedom’ rootstock in 2024. FIG. 1 Fruit cluster on the seedling vine taken in September 2017. FIG. 2 Fruit cluster (natural at right, from vine treated with exogenous gibberellic acid, at left), taken in September 2022. FIG. 3 Shoot with meristem, leaves and tendrils in 2022. FIG. 4 Leaves, top and bottom view. FIG. 5 Fruit on mature vine with no application of gibberellic acid and girdle. FIG. 6 Fruit on mature vine sprayed with exogenous gibberellic acid and with trunk girdling. DETAILED BOTANICAL DESCRIPTION The following detailed description sets forth the distinctive characteristics of ‘SV36-21-170’. Descriptions of the new invention apply to vines of ‘SV36-21-170’ grown on ‘Freedom’ rootstock at a density of 1,537 vines per hectare grown near McFarland, California in 2023 and 2024. These vines were observed in immediate year following planting and in the following year of full production having been planted in 2018. These descriptions are believed to apply generally to the new variety grown under similar circumstances elsewhere. Variation due to soil and climatic conditions in other locations may be seen. References to color correspond to The Royal Horticultural Society's Colour Chart, The Royal Horticultural Society, London, United Kingdom (copyright 2001). Descriptors used herein conform to those set forth by the International Board for Plant Genetic Resources Institute Grape Descriptors ( Vitis spp.) of 1983 and/or 1997 which were developed in collaboration with the Office International de la Vigne et du Vin (OIV) and the International Union for the Protection of New Varieties of Plants (UPOV) and published in Descriptors for Grapevine ( Vitis spp .) (Anonymous, International Plant Genetic Resources Institute, 1997, ISBN 92-9043-352-3). Classification: Family .—Vitaceae. Botanical name.—Vitis vinifera. Variety name .—‘SV36-21-170’. Plant: Vigor .—High. Density of foliage .—Heavy. Productivity .—High when spur pruned, up to 4,298 kg/hectare. Hardiness .—Hardiness observed to 0° C. Rootstock .—‘Freedom’ (unpatented). Trunk: Shape .—Broadly elliptical. Straps .—Long, split. Surface texture .—Shaggy. Trunk circumference.— 25 cm at 1.0 m of height of 4 year old plants. Inner bark color .—RHS Greyed orange group 173B. Outer bark color .—RHS Brown group 200B. Mature leaves: Average blade length.— 16.1 cm. Average blade width.— 18.2 cm. Size of blade .—Large. Shape .—Pentagonal. Number of distinct lobes.— 5. Anthocyanin coloration of main veins on the upper side of the blade .—Absent. Color of main veins, upper side of leaves .—RHS green group 143B. Color of main veins, lower side of leaves .—RHS yellow green group 150D. Venation pattern .—Pentagonal with 5 main veins. Mature leaf profile .—Undulating. Blistering ( upper surface ).—Absent. Leaf blade tip .—In plane of blade. Margins .—Lobed, serrated, undulating. Apex .—Apiculate. Bases .—Sagittate. Thickness .—Medium. Undulation of blade between main and lateral veins .—Slight. Shape of teeth .—Broadly conical, both sides convex. Length of teeth.— 7.1 mm. Width of teeth.— 11.6 mm. Ratio length/width of teeth.—About 7:11. General shape of petiole sinus .—Half open. Tooth at petiole sinus .—Absent. Petiole sinus limited by veins .—Absent. Depth of upper lateral sinus .—Medium. Shape of upper lateral sinus .—Strongly overlapping. Prostrate hairs between veins ( lower surface ).—Absent. Erect hairs between veins ( lower surface ).—Absent. Prostrate hairs on main veins ( lower surface ).—Absent. Density of erect hairs on main veins ( lower surface ).—Sparse. Prostrate hairs on main veins ( upper surface ).—Present. Upper surface .—Summer color: Yellow Green group 147A. Surface texture: Smooth. Surface appearance: Dull. Goffering of blade: Absent. Lower surface .—Summer color: RHS Green group 146B. Anthocyanin coloration of main veins on lower leaf surface: Absent. Anthocyanin coloration on laterals: Absent. Glossiness: Low. Pubescence: Absent. Surface texture: Rough. Surface appearance: Dull. Petiole .—Length: 15.4 cm. Diameter: 4.1 mm. Length of petiole compared to middle vein: Slightly shorter. Density of prostrate hairs: Absent. Density of erect hairs: Absent. Color: In shade: RHS Yellow Green group N144D. In sun: RHS Yellow Green group N144D. Tendrils: Number .—Bifurcated and trifurcated; Continuous after 6th node. Length.— 22.4 cm. Diameter.— 3.5 mm. Texture .—Smooth. Summer color .—Yellow green group 144A. Autumn color .—Yellow green group 144A developing into Red purple group 60B. Growing tips (young shoot): Prostrate hairs on tips .—Present. Anthocyanin coloration of prostrate hairs on tips .—Absent. Erect hairs on tips .—Absent. Color .—RHS Yellow Green group 153C. Anthocyanins .—Present. Shape .—Rounded. Apex .—Fully open. Shoot attitude .—Erect. Green summer shoots: Internode color upper surface .—RHS Greyed red group 179A. Internode color lower surface .—RHS Yellow Green group 145B. Node color upper surface .—RHS Greyed orange group 174A. Node color lower surface .—RHS Yellow Green group 145A. Erect hairs on internode .—Absent. Woody shoot: Canes .—Shape: Broadly elliptic. Internode length: About 17.1 cm. Width at node: About 10.6 mm. Surface: Smooth. Main color: RHS Greyed orange group 166C. Lenticels: Inconspicuous. Laterals .—Length: 24 cm. Diameter: 3.8 mm. Internode length: 4 cm. Summer color: Yellow green group 147A. Buds .—Shape: Pointed. Cane bud fruitfulness: Shoots from the basal two buds generally bear two flower clusters. Length: 6.1 mm. Width: 3.8 mm. Height: 3.6 mm. Color: RHS Greyed Orange group 166A. Flowers: Flower sex .—Hermaphrodite. Position of first flowering nodes.— 3rd node. Number of inflorescences per shoot.— 2. Calyptra color .—RHS yellow-green group 144B. Ovary length.— 1.6 mm. Ovary width.— 1.4 mm. Ovary color .—RHS yellow-green group 144A. Filament length.— 1.8 mm. Filament color .—Translucent, absence of pigmentation. Anther length.— 1 mm. Anther color .—RHS greyed-orange group N167A. Date of full bloom .—May 9, 2022. Fruit: Ripening period .—Late September, Delano, California. Date of ripening .—Oct. 27, 2022 at McFarland, California. Use .—Fresh market. Keeping quality .—Very good with no decay after 30 days of cold storage at 0.56 C. Shipping quality .—Good; there was no detached berries found in a 8.6 kg box of fruit test- shipped by truck for 4 hours at 0.56 C. Solids - sugar .—High, about 21 brix at full maturity. Refractometer test.— 22 brix. Total acidity.— 0.39 g/liter. pH.— 5.21. Bunch .—Size: Large. Length (peduncle excluded): About 24 cm. Width: About 14 cm. Mass: Natural, without gibberellic acid treatment: 825 g. With gibberellic acid treatment: 980 g. Density: Well filled, medium density. Number of berries (without gibberellic acid treatment): 107. Number of berries (with gibberellic acid treatment: 91. Form: Conical. Peduncle .—Length: About 7.1 cm. Lignification: 0.5 cm of peduncle. Main color: Fresh: RHS Green group 144C. Berry .—Size: Large. Uniformity of size: Uniform. Weight Natural, without gibberellic acid treatment: 7.6 g. With gibberellic acid treatment: 10.6 g. Shape: Natural, without gibberellic acid treatment: Elliptic. With gibberellic acid treatment: Elliptic. Presence of seeds: Seedless; most berries develop one or two small, soft rudimentary seeds less than 1.0 mm in length. Cross section: Circular. Dimensions: Length: Natural: 2.8 cm. With gibberellic acid treatment: 3.2 cm. Width: Natural: 2.2 cm. With gibberellic acid treatment: 2.4 cm. Skin color (without bloom): RHS Greyed purple group 185A. Coloration of flesh: Translucent; Yellow green group 154D. Juiciness of flesh: Slightly juicy. Berry firmness: Firm. Particular flavor: Neutral, typical vinifera. Bloom (cuticular wax): Strong. Pedicel length: 7.3 mm. Berry separation from pedicel: Difficult. Skin .—Thickness: Medium. Texture: Crisp. Reticulation: Absent. Roughness: Absent. Tenacity: Tenacious to flesh. Tendency to crack: Resistant. Ripening disease and insect resistance: No particular resistance or susceptibility has been observed. Normal disease control practices can be used.