Patent Grant
PP36237
Latin name of the genus and species: The Latin name of the novel, ornamental plant variety disclosed herein is Ipomoea batatas (L.) Lam.
Variety denomination: The inventive cultivar of Ipomoea batatas disclosed herein has been given the varietal denomination ‘NCORNSP-031SHMG’.
Ipomoea batatas is a member of the morning glory family Convolvulaceae. This species is grown worldwide and it exhibits a wide range of plant forms and colors. The cultivated members of Ipomoea batatas grown by farmers worldwide are commonly produced for consumption of their nutritious, enlarged storage roots. These types typically produce a fast-growing green vine that has a wide variety of leaf shapes ranging from palmate and deeply lobed, to cordate or triangular shaped leaves with no lobes.
Like their edible forms, Ipomoea batatas ornamental sweetpotato plants are a heat-loving, drought-tolerant, perennial vine typically grown as an annual. However, ornamental sweetpotato plants are distinguished from the edible cultivated forms in that they often do not produce attractive, enlarged storage roots suitable for human consumption. Instead, they possess unique foliage colors, leaf shapes, and growth habits, which have significant value in the ornamental marketplace.
Ornamental sweetpotatoes are desirable in the landscape and ornamental industries because their foliage comes in a wide variety of colors (e.g., pale yellow to dark purple with some exhibiting temporal and individual leaf color variegation patterns) and plant shapes (e.g., mounded and very compact to prostrate and highly spreading). They can be grown in a potted plant and/or mixed planting format, and they can cover a large space or hang over walls and decorative pots creating brightly colored and textured backdrops in gardens and patios. Most ornamental sweetpotatoes grow and last the entire growing season and they require little maintenance. Moreover, these plants have few insect or disease problems.
To meet the growing horticultural demand for ornamental sweetpotatoes, it is desirable to produce new cultivars of ornamental sweetpotato with new or improved foliage colors, variegation patterns, leaf shapes, and plant architectures. In addition, it would be advantageous to develop cultivars of ornamental sweetpotato exhibiting a more compact growth that do not out-compete other species in mixed containers.
‘NCORNSP-031SHMG’ was bred to meet the demand for new ornamental sweetpotatoes. ‘NCORNSP-031SHMG’ is a moderately compact and loosely upright variety with a moderate growth rate and is well branched. It is distinguishable from other ornamental sweetpotato cultivars by its dark red heart-shaped leaves, a moderately-compact habit and semi- erect mounding plant architecture. The dark red leaves, uniform color, short internodes, and the plant architecture, which promotes good plant production in the greenhouse for wholesale distributors, distinguishes ‘NCORNSP-031SHMG’ amongst the current ornamental sweetpotatoes in the marketplace. In greenhouse and field trials conducted since 2020 by the breeding program and industry collaborators ‘NCORNSP-031SHMG’ has been shown to be less vigorous than Ipomoea batatas ‘Margarita’ (unpatented) and ‘Blackie’ (unpatented) and is suitable for use as a landscape or containerized plant. The production of flowers by ‘NCORNSP-031SHMG’ is not observed under short-day conditions.
Lineage. ‘NCORNSP-031SHMG’ (breeding designation NC10430-003ORN) originated from a cross between from the proprietary Ipomoea batatas breeding lines ‘NC9045-003 ORN’ (the female parent; not patented) and ‘NC9916-001ORN’ (the male parent; not patented). Botanical seed from the paired-crosses was harvested between October 2019 and February 2020 in Raleigh, North Carolina from ornamental lines that were grafted onto a flower-inducing I. setosa Brazilian morning glory line in the greenhouses. The female parent of ‘NCORNSP-031SHMG’, ‘NC9045-003ORN’, resulted from hand-pollinated seed harvested from the proprietary Ipomoea batatas breeding line ‘NC8412-001ORN’ (the female parent; not patented) and ‘NC8408-036’ (the male parent; not patented). The male parent of ‘NCORNSP-031SHMG’, ‘NC9916-001ORN’ resulted from hand-pollinated seed collected from ‘NC9001-001ORN’ (the female parent; not patented) and ‘NC8965-001ORN’ (the male parent; not patented). Botanical seed from this cross were planted in the greenhouse in February 2020. The first cycle of selection on the population was exercised at the seedling tray stage and each survivor was transferred to a single 6-inch pot, which was then maintained in the greenhouse. Cuttings (2 each) were taken from the plants in April and planted in the field as unreplicated 2-plant plots, during mid-June 2020. The single, individual plant now known as ‘NCORNSP-031SHMG’ was selected Sep. 25, 2020, because of its combination of exceptional features, and it has been propagated asexually since that time.
Asexual Reproduction. Since its selection, Ipomoea batatas ‘NCORNSP-031SHMG’ has been asexually reproduced in Raleigh, North Carolina predominantly by vegetative propagation of vine cuttings. Successively, there have been six cycles of vegetative propagation, one cycle of tissue culture micropropagation, and multiple vegetative propagation cycles to increase plant numbers. Asexual reproduction of ‘NCORNSP-031SHMG’ by cuttings has shown that the unique features of the new cultivar are stable, and the plant reproduces true to type in successive generations.
‘NCORNSP-031SHMG’ was bred to meet the increasing demand for new ornamental sweetpotatoes. ‘NCORNSP-031SHMG’ is a moderately compact and loosely upright variety with a moderate growth rate and is well branched. It is distinguishable from other ornamental sweetpotato cultivars by its dark red heart-shaped leaves, a moderately-compact habit and semi- erect mounding plant architecture. The dark red leaves, uniform color, short internodes, and the plant architecture, which promotes good plant production in the greenhouse for wholesale distributors, distinguishes ‘NCORNSP-031SHMG’ amongst the current ornamental sweetpotatoes in the marketplace. In greenhouse and field trials, ‘NCORNSP-031SHMG’ has been shown to be less vigorous than Ipomoea batatas ‘Margarita’ and ‘Blackie’ and is suitable for use as a landscape or containerized plant. The production of flowers by ‘NCORNSP-031SHMG’ is not observed under short-day conditions.
The photographs in the drawings were made using conventional techniques and show the colors as true as reasonably possible by conventional photography. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which more accurately describe the colors of the new Ipomoea batatas.
The following is a detailed description of the botanical characteristics of a new and distinct cultivar of Ipomoea batatas plant known by the cultivar name ‘NCORNSP-031SHMG’. All colors cited herein refer to The Royal Horticulture Society Colour Chart designations (The Royal Horticultural Society, London, 1995, 4th ed.) except where general terms of ordinary dictionary significance are used. Plant descriptions are based on the standardized international sweetpotato descriptors established jointly by the International Potato Center (CIP), Lima, Peru; The Asian Vegetable Research and Development Center (AVRDC), Taipei, Taiwan; and the International Board for Plant Genetics Resources (IBPGR), Rome, Italy (CIP, AVRDC, IBPGR. 1991. Descriptors for Sweet Potato. Huaman, Z., editor. International Board for Plant Genetic Resources, Rome, Italy, 134pp.). Where dimensions, sizes, colors, and other characteristics are given, it is to be understood that such characteristics are approximations or averages set forth as accurately as practicable.
The descriptions reported herein are from a group of 58-day-old specimens grown individually in six-inch azalea pots. The plants were grown in Raleigh, NC, under commercial practice in a plastic-covered greenhouse, where, during the summer, day and night temperatures range between 30-40° C. and 22-26° C., respectively. After rooting, plants were treated with 200 ppm N 20-10-20 fertilizer weekly. Plant histories were taken in July 2023 in Raleigh, North Carolina. Ipomoea batatas ‘NCORNSP-031SHMG’ has not been observed under all possible environmental conditions; therefore, the phenotype may vary under different environmental conditions such as season, temperature, light intensity, day length, cultural conditions, and the like, without however, any variance in the genotype.
‘NCORNSP-031SHMG’ is distinct from its parents, ‘NC9045-003ORN’ and ‘NC9916-001ORN’, by its color, vigor, and branching. ‘NCORNSP-031SHMG’ is a lighter shade of red than either parent, and the color is more uniform throughout the season. ‘NCORNSP-031SHMG’ is also has higher vigor and denser branching than either ‘NC9045-003ORN’ or ‘NC9916-001ORN’.
Ipomoea batatas cultivars.
