Grapevine cv. ‘Sugratwentythree’

Details Grapevine cv. ‘Sugratwentythree’ Grapevine cv. ‘Sugratwentythree’

2001-01-25

2002-11-05

Campell, Bruce R. (Department: 1661)

Plants

Fruit

Grape

Plant Patent

active

PP013164

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to the discovery and asexual propagation of a new variety of grapevine,
Vitis vinifera
cv. ‘Sugratwentythree’. The new variety was first hybridized by David W. Cain in Wasco, Kern County, Calif., the variety being originated by controlled hybridization and subsequent ovule culture of normally abortive seeds. The new variety is characterized by producing naturally large black seedless grapes that are responsive to girdling to increase berry size. The high quality, firm berries are round to ovate in shape, and ripen in midseason.
The seed parent is the ‘Sun World Breeding Selection 89339-089-291’ (nonpatented) variety and the pollen parent is the ‘Sun World Breeding Selection 89098-194-167’ (nonpatented). The parent varieties were first crossed in May, 1992, with the date of first flowering being May 1995. The new ‘Sugratwentythree’ variety was first asexually propagated by David W. Cain in December 1995 in Wasco, Kern County, Calif., using hardwood cuttings.
The new grapevine variety cv. ‘Sugratwentythree’ most nearly resembles its seed parent, ‘Sun World Breeding Selection 89339-089-291’. ‘Sugratwentythree’ differs from its seed parent by having a far superior eating quality. ‘Sugratwentythree’ produces slightly larger, firmer berries that contain smaller vestigial seed traces, as compared to its maternal parent. The new variety ‘Sugratwentythree’ differs from its paternal parent, ‘Sun World Breeding Selection 89098-194-167’ by producing berries that are less prone to cracking and rot. Moreover, ‘Sugratwentythree’ berries are larger, firmer, and have a later ripening date as compared to the berries of the pollen parent.
The new variety cv. ‘Sugratwentythree’ distinguished from other commonly grown black grapes such as the ‘Ribier’ (nonpatented) and the ‘Summer Royal’ (nonpatented) by several important characteristics.
‘Sugratwentythree’ resembles the ‘Ribier’ variety, but differs from it by having small, soft, vestigial seed traces as compared to the lignified, normal-sized seeds present in the ‘Ribier’ variety. Additionally, berries of the new variety ‘Sugratwentythree’ are firmer and have a higher sugar content compared to the berries of the ‘Ribier’ variety.
The new variety cv. ‘Sugratwentythree’ also resembles the nonpatented ‘Summer Royal’ grape variety. It is distinguished from this variety by having larger berries (6 to 8 grams per berry as compared to 4.3 to 5.3 grams per berry in the ‘Summer Royal’ variety). Berries of the ‘Sugratwentythree’ variety ripen approximately 1 week earlier than the ‘Summer Royal’ variety, on clusters that are more compact compared to the ‘Summer Royal’ variety.
The new ‘Sugratwentythree’ variety has been shown to maintain its distinguishing characteristics through successive asexual propagations by, for example, cuttings.

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