Grapevine cv. ‘Sugratwentytwo’

Details Grapevine cv. ‘Sugratwentytwo’ Grapevine cv. ‘Sugratwentytwo’

2001-01-25

2002-11-12

Campell, Bruce R. (Department: 1661)

Plants

Fruit

Grape

Plant Patent

active

PP013198

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. ‘Sugratwentytwo’. The new variety was first hybridized by David W. Cain in Wasco, Kern County, Calif., the variety being originated by controlled hybridization and subsequent embryo rescue of abortive seed traces. The new variety is characterized by white, medium sized seedless berries that are crisp and are oblong in shape. The new variety produces larger berries in response to gibberellic acid application, and is extremely productive when pruned to short spurs.
The seed parent is ‘Sun World Breeding Selection 89152-064-236’ (unpatented) and the pollen parent is ‘Sun World Breeding Selection 89134-202-189’ (unpatented). The parent varieties were first crossed in May, 1993, with the date of first flowering being May, 1995. The new ‘Sugratwentytwo’ 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. ‘Sugratwentytwo’ resembles its seed parent ‘89152-064-236’ in outward appearance, but differs by producing berries with superior eating quality, containing higher sugar and lower acid content than in the maternal parent. ‘Sugratwentytwo’ is distinguished from the pollen parent, ‘89134-202-189’ by being more elongated, in addition to exhibiting better harvesting and shipping characteristics due to its stronger, more lignified peduncle, rachis, pedicel and torus that function to attach the berries more strongly to the cluster.
The new ‘Sugratwentytwo’ is distinguished from other commonly grown grapes such as the ‘Autumn Seedless’ (unpatented) and the ‘Thompson Seedless’ (unpatented) varieties. The ‘Sugratwentytwo’ most nearly resembles the ‘Autumn Seedless’ variety, but is distinguished from the ‘Autumn Seedless’ variety by producing crisp berries that have a creamy yellow green color. The ‘Autumn Seedless’ variety, in contrast, produces berries of less commercially acceptable darker green color that turn pink when exposed to direct sunlight. Moreover, while the yields of the ‘Autumn Seedless’ variety are often low, the new ‘Sugratwentytwo’ variety possesses a fruitful vine that is more capable of producing commercially acceptable yields.
‘Sugratwentytwo’ bears a slight resemblance to the ‘Thompson Seedless’ variety but is distinguished from the ‘Thompson Seedless’ variety by several important characteristics. The new variety ‘Sugratwentytwo’ produces berries that are more crisp and naturally larger than the ‘Thompson Seedless’ variety. ‘Sugratwentytwo’ berries have a stronger attachment to the cluster, and are more resistant to adverse weather conditions than the ‘Thompson Seedless’ variety. The vestigial seeds of ‘Sugratwentytwo’ are slightly larger than the vestigial seeds of the ‘Thompson Seedless’ variety. Additionally, ‘Sugratwentytwo’ berries can be allowed to stay on the vine much later, as they ripen approximately 60 days later than the ‘Thompson Seedless’ variety.
The new ‘Sugratwentytwo’ variety has been shown to maintain its distinguishing characteristics through successive asexual propagations by, for example, cuttings.

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