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Intensive selective breeding has been ongoing in California since the 1950s for seedlessness in raisin and table. [75]: 303 Much of the world's seedless varieties originate in this state's breeding efforts. [75]: 303 Aradhya et al., 2003 finds that California's accessions of germplasm originates from a single original gene pool. [76]
Thomcord grape is a hybrid of Thompson Seedless grape (Vitis vinifera, or Sultanina), which is popular in American (?) supermarkets during the summer, and seeded Concord grape (Vitis labrusca), commonly used to make grape juice and jelly. [2] [3] It is a plump, juicy, seedless table grape and is slightly firmer than Concord. Thomcord has a blue ...
These elongated seedless grapes, also called Sweet Sapphires, were bred by International Fruit Genetics, a California-based fruit breeding and patenting company, and launched in 2004.
Before Thompson Seedless became dominant, Muscat of Alexandria was a primary raisin grape in California. [ 2 ] Nowadays, American sultana grapes are almost invariably Thompson Seedless, a name that refers to William Thompson , a viticulturist who was an early grower in California and is sometimes credited with introducing the variety.
The berries of the Autumn Royal are larger than most other grape varieties produce. The berries naturally weigh at least 8 grams, compared with the berries of the Thompson seedless, which weigh 6-7 grams even when girdled and treated with gibberellin. [2] It is currently the largest natural berry size among seedless cultivars.
Seedless grapes are divided into white, red and black types based roughly on fruit color. The most popular seedless grape is known in the United States as 'Thompson Seedless', but was originally known as 'Sultana'. It is believed to be of ancient origin. It is considered a white grape, but is actually a pale green.
Table grapes commonly sold in North American and European markets include Sultana (Thompson Seedless), Flame, Muscat, Almeria, Niagara and Concord. In the United States, California remains the largest single producer of table grapes with over 85,000 acres under cultivation. According to the USDA over 70 varietals are grown in the state, but the ...
In North America, the most common grape juice is purple and made from Concord grapes, while white grape juice is commonly made from Niagara grapes, both of which are varieties of native American grapes, a different species from European wine grapes. In California, Sultana (known there as Thompson Seedless) grapes are sometimes diverted from the ...