Grapevine plant named ‘Sugratwentyeight’

Details Grapevine plant named ‘Sugratwentyeight’ Grapevine plant named ‘Sugratwentyeight’

2003-07-10

2004-10-12

Grunberg, Anne Marie (Department: 1661)

Plants

Fruit

Grape

Plant Patent

active

PP015229

ABSTRACT:

Latin name of the genus and species claimed:
Vitis vinifera.
Variety denominations: ‘Sugratwentyeight’.
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to the discovery and asexual propagation of a new variety of grapevine as herein described and illustrated. The new variety was first hybridized by David W. Cain and Michael J. Striem in Kern County, Calif. The new variety ‘Sugratwentyeight’ is characterized by possessing naturally large, round, seedless grapes. The grapes have a black tough and tannin skin, with medium sugar content, and medium acidity, resulting in a good eating quality. The grapes ripen mid-season, approximately a week before ‘Redglobe’ (unpatented) and about 3-4 weeks after ‘Thompson seedless’ (unpatented) grape, when grown in the San Joaquin Valley, Calif.
The new variety was created by hybridization of two “seedless” grapes possessing small, abortive, vestigial ovules. From the initial population of hybrid ovules, embryo rescue procedures were used to produce a population from which the present variety was selected. The seed parent is ‘Sun World Seedling 89145-062-244’ (unpatented) variety and the pollen parent is ‘Sun World Seedling 89014-019-280’ (unpatented). The parent varieties were first crossed in May 1992, with the date of sowing being August 1992, and the date of first flowering being May 1994. The new ‘Sugratwentyeight’ variety was first asexually propagated by David W. Cain in January, 1995, in Wasco, Kern County, Calif., using hardwood cuttings.
The new variety ‘Sugratwentyeight’ is distinguishable from its seed parent ‘Sun World Seedling 89145-062-244’ by having a much smaller and softer seed trace. Additionally, the berry skin color of ‘Sugratwentyeight’ is much darker than the berry skin color of its seed-parent. The pollen parent ‘Sun World Seedling 88014-019-280’ tends to develop many shot berries, and the large berries are much softer than those of ‘Sugratwentyeight’.
The new variety ‘Sugratwentyeight’ most nearly resembles the ‘Sugrasixteen’ variety U.S. Plant Pat. No. 11,749) in its berry skin color and ripening time. It can be distinguished from ‘Sugrasixteen’ by possessing round grapes with firm and juicy flesh, along with a tough skin having a tannin flavor. Additionally, the vine of the new variety ‘Sugratwentyeight’ is less vigorous and less productive than the vine of ‘Sugrasixteen’. It also differs from ‘Sugrasixteen’ by having naturally larger and round berries, with much heavier bloom on the berry skin.
The new grapevine variety ‘Sugratwentyeight’ also resembles the ‘Redglobe’ grapevine variety by possessing large, rounded grapes. It can be distinguished from the ‘Redglobe’ variety by being seedless and by ripening about one week earlier than ‘Redglobe’. The new grapevine variety can be further distinguished from ‘Redglobe’ by having a black berry color, and tough, tannic skin.
The new ‘Sugratwentyeight’ variety has been shown to maintain its distinguishing characteristics through successive asexual propagations by, for example, cuttings.


REFERENCES:
patent: PP11749 (2001-01-01), Cain

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