Sweet orange tree named ‘OLL-20’

Abstract

A new and distinct sweet orange clone ‘OLL-20’ has been developed from an unstable sweet orange selection designated as ‘OLL’, using tissue culture techniques. Undeveloped ovules from fruit of selection ‘OLL’ were cultured in vitro to generate an embryogenic callus, from which multiple independent clones were regenerated via somatic embryogenesis. Regenerated plantlets (somaclones) were grafted to UFR rootstocks and grown in the field for evaluation.

Claims

1. A new and distinct cultivar of sweet orange tree named ‘OLL-20’ as illustrated and described herein.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) ‘OLL-20’ is illustrated by the accompanying photographs, which show the tree's form, foliage and fruit. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. The photographs are of a ‘OLL-20’ tree approximately 5-years old.

(2) FIG. 1. Shows a ‘OLL-20’ tree on UFR-4 rootstock as well as the overall plant growth habit of ‘OLL-20’.

(3) FIG. 2. Shows a close-up view of ‘OLL-20’ leaves and fruit set.

(4) FIG. 3. Shows a close-up view of ‘OLL-20’ flowers and flower buds.

(5) FIG. 4. Shows a close-up view of a mature ‘OLL-20’ flower.

(6) FIG. 5. Shows fully expanded view of a ‘OLL-20’ leaf

(7) FIG. 6. Shows a close-up view of whole and cut mature fruits with seeds

(8) FIG. 7. Shows a close-up view of the cross section of the fruits and the seeds from mature fruits.

DETAILED BOTANICAL DESCRIPTION

(9) The following detailed description sets forth the distinctive characteristics of ‘OLL-20’. The present botanical description is that of a ‘OLL-20’ tree approximately 5-years old grown in Florida. The colors (except those in common terms) are described from R.H.S. Colour Chart published by The Royal Horticultural Society in London (2007, 5th edition), in association with the Flower Council of Holland. Classification: Botanical.—Citrus sinensis. Common name.—Sweet Orange. Parentage: ‘OLL’ (Orie Lee Late) sweet orange tree selected by Mr. Orie Lee, believed to have originated from a 40+ year old abandoned putative USDA irradiated Pineapple sweet orange trial. Tree: Ploidy: Diploid. Size: Medium. Width across row.—3.5 meter. Width down row.—2.95 meter on average. Tree height: 3.05 meters. Tree diameter: 2.84 meters in Diameter. Tree spread: up to 3.1 meter. Vigor: Moderate to vigorous. Density: Canopies are quite dense. Tree shape (form): oblate shape (obloid). Growth habit: Vegetative growth upright, but drooping with heavy fruit load. Trunk: Trunk diameter: 12.6 cm at 30 cm above the ground. Trunk texture: Smooth. Trunk bark color: RHS N199 A (Greyed Brown). Branches: Branch length: 2-2.5 meters on average. Crotch angel: Acute, with degree of 80-85 on average (less than 90 degree). Branch texture: Relatively smooth with very small spines. Branch color: RHS N199 A (Greyed Brown). Spine size: 10-15 mm in length and 3 mm in diameter. Spine color: RHS N199 B (Greyed Brown) with some RHS 138 A (Green) based on the age of the branch. Leaves: Size (lamina average).—Length: 122 mm on average. Width: 52 mm on average. L/W ratio: 2.3 on average. Thickness: regular and average for a typical sweet orange. Type: simple (unifoliate). Shape: Elliptical. Apex: slightly retuse. Base: acute. Margin: weakly dentate. Surface: Upper surface: smooth. Lower surface: medium vein that are pinnately netted. Color: Upper surface (adaxial): RHS 137 A (Green). Lower surface (abaxial): RHS 137 C (Green). Petiole.—Shape and attachment: Brevipetiolate; shorter than leaf lamina, junction between petiole and lamina is articulate. Shape (petiole wing): narrow, obovate with narrow end at the base. Length: 15-20 mm on average. Width: 3-5 mm. Color: RHS 137 A (Green). Flowers: Type: Hermaphroditic Flower bearing: (Single or cluster): Branches have flowers grown in cluster. Each cluster Consists of 2-6 flowers. Individual flowers grown from leaf terminals and leaf axillaries. Flower diameter: Fully open flower with average diameter of 31 mm. Flower depth: Typical flower with average depth of 12 mm. Flower blooming period: First bloom.—Usually mid- to late March in Florida. Full bloom.—Usually early April. Fragrance: Fragrant. Flower buds size: Length.—2.1 mm for the initial visible flower bud; 20.5 mm for the mature flower buds before opened. Diameter.—2.2 mm in the initial visible flower bud; 7.5 mm in the mature bud. Flower bud shape: Initial visible flower bud with round dome shape; mature flower bud with elongated olive shape. Flower bud color (R.H.S.): 144 D (yellow-Green) for the initial visible flower bud ; RHS NN 155 A (white) for mature buds. Reproductive organs: Fertility: Self-fertile. Petals: Number.—5. Petal length.—17.1-19 mm in average. Petal width.—7.2-8 mm in average. Petal shape.—Flat spatula shape. Apex shape.—Smooth with obtuse angle. Base shape.—Obtuse. Petal color.—Upper Surface: RHS 155 B (white Group). Lower surface: RHS NN 155 A (white Group). Margin.—Smooth. Sepal: Number (per flower).—3-5. Shape.—Delta Shaped with acute angle at apex. Length.—3.5 mm. Width.—3.5 mm. Apex shape.—Acute angle at apex. Margin.—Smooth. Color.—Upper surface: RHS 157C (Green-White). Lower surface: RHS 157B (Green-White). Pedicel: Length.—10.5 mm in average. Diameter.—1.5 mm. Color.—RHS 144 C (Yellow-Green). Stamen: Number.—20 per flower on average. Length.—13.2.mm on average. Anther: Length.—2.5 mm. Width.—0.7-1 mm. Color.—RHS 11B (Yellow). Pollen color (general).—RHS 13 A (Yellow). Amount of pollen.—Abundant. Pistil: Number.—1. Length.—14 mm. Color.—RHS 153 B (Yellow-Green). Style length.—10.2 mm. Style diameter.—1.4 mm. Style color.—RHS 144 D (Yellow-Green). Ovary shape.—Oval shape. Ovary diameter.—3.4 mm. Ovary color.—RHS 143 C (Green). Fruit: Size.—Uniform. Average weight (per individual fruit).—223.5 grams. Length.—8.2 cm on average. Diameter.—7.8 cm (cross section) on average. Shape.—Obloid. Shape (cross-section).—Round. Apex.—Round. Base.—Truncated. Position of the broadest part of the fruit.—At the middle. Harvest: Date of first pick.—Late February. Date of last pick.—End of May. Fruit stem: Length.—13 mm. Diameter.—5 mm. Color.—RHS N199 A (Greyed Brown). Rind: Adherence.—Albedo (Mesocarp) to flesh (endocarp) medium to strong. Thickness.—Medium 3 mm on average. Texture.—Firm. Surface texture.—Relatively smooth. Color.—Flavedo (epicarp): RHS 23A (Yellow Orange). Albedo (mesocarp): RHS 14 D (Yellow Orange). Style end.—Closed. Rind oil cell density.—83-85 cell/square cm. Oil gland size.—Very small 0.7 mm. Flesh: Number of segments.—10-11. Segment walls (thickness).—Thin to medium, soft but sufficient strength to maintain Integrity as separated. Juice.—Abundant. Color.—RHS 22A (Yellow Orange). Texture.—Soft to medium. Vesicles.—Medium thickness. Length: 12.5 -14 mm. Diameter: 2-3 mm in average. Juice quality: Brix.—12-14. Acidity (average).—0.8-0.85. Ratio.—12-18. Lb solid/box.—6.5-7.2. Seeds: Type.—Polyembryonic. Number.—0-5 per fruit. Shape.—Clavate, some elongated Oval shape. Size.—Length: 15 mm on average. Width: 7.5 mm. Outer surface.—RHS 158B (Yellow-White) and slightly wrinkled. Inner seed coat color.—RHS 165 C (Greyed-Orange). Inner surface color.—161C (Greyed-Yellow). Cotyledon color.—RHS 157C (Green-White). Fruit.—Parthenocarpic. Resistance to diseases: No obvious tree-debilitating disease problems have been observed in the trees or fruit currently grown, but systematic resistance testing has not been yet explored. Citrus canker lesions have been found on leaves of ‘OLL-20’, but with frequency and severity less than that of ‘OLL-8’, suggesting that its canker tolerance is similar to that of Valencia. HLB tolerance appears slightly better than that of Valencia (also supported by Tropicana).