Plants – Fruit – Grape
Plant Patent
2001-01-25
2003-01-07
Campell, Bruce R. (Department: 1661)
Plants
Fruit
Grape
Plant Patent
active
PP013448
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. ‘Sugratwenty’. The new variety was first hybridized by David W. Cain in Wasco, Kern County, Calif., the variety being originated by controlled hybridization. The new variety is characterized by producing red, obovate, extremely crisp, medium sized seedless berries which increase in size in response to exogenously applied gibberellic acid. The new variety produces very large, naturally loose clusters and is extremely productive when spur pruned.
The seed parent is the ‘Christmas Rose’ (U.S. Plant Pat. No. 5,056) variety. The pollen parent is the ‘U.S. Department of Agriculture selection B31-164’ variety. The parent varieties were first crossed in May, 1989, with the date of first flowering being May, 1991. The new ‘Sugratwenty’ variety was first asexually propagated by David W. Cain near Wasco, Kern County, Calif., in December, 1991 by using cuttings.
The new grapevine variety cv. ‘Sugratwenty’ resembles its seed parent the ‘Christmas Rose’ in outward appearance. It differs from the ‘Christmas Rose’ variety by possessing vestigial seed traces rather than fully developed, hard seeds. It also differs from its seed parent the ‘Christmas Rose’ by having smaller berries which color with more difficulty. The new variety ‘Sugratwenty’ differs from its pollen parent, the unnamed, nonpatented ‘B31-164’ by having smaller, less-lignified seed remnants and obovate rather than round berries which ripen later.
‘Sugratwenty’ is distinguished from other commonly grown red seedless grapes such as the ‘Crimson’ (nonpatented) variety and the ‘Ruby Seedless’ (nonpatented) variety. The new variety ‘Sugratwenty’ most nearly resembles the ‘Crimson’ variety, but differs from ‘Crimson’ by possessing a more fruitful but less vigorous vine. The berries of ‘Sugratwenty’ are more broadly obovate than the narrow, elongated, cylindrical berries of ‘Crimson’. Additionally, ‘Sugratwenty’ produces clusters that are larger and looser than in the ‘Crimson’ variety.
The new variety ‘Sugratwenty’ differs from the ‘Ruby Seedless’ variety by producing larger, firmer berries. It also is distinguished from the ‘Ruby Seedless’ variety in that the berries attain a much brighter, less blackish-red coloration but are more difficult to color than the berries of the ‘Ruby Seedless’ variety.
The new ‘Sugratwenty’ variety has been shown to maintain its distinguishing characteristics through successive propagations by, for example, cuttings.
REFERENCES:
patent: PP5056 (1983-05-01), Olmo et al.
Kizilkaya Michelle
Knobbe Martens Olson & Bear
Sun World International Inc.
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