Cabernet Sauvignon, one of world's most widely recognized red wine

Cabernet Sauvignon is one of the world's most widely recognized red wine grape varieties. It is grown in nearly every major wine producing country among a diverse spectrum of climates from Canada's Okanagan Valley to Lebanon's Beqaa Valley. Cabernet Sauvignon became internationally recognized through its prominence in Bordeaux wines where it is often blended with Merlot and Cabernet Franc. From France, the grape spread across Europe and to the New World where it found new homes in places like California's Napa Valley, Australia's Coonawarra region and Chile's Maipo Valley. For most of the 20th century, it was the world's most widely planted premium red wine grape until it was surpassed by Merlot in the 1990s.

Despite its prominence in the industry, the grape is a relatively new variety, the product of a chance crossing between Cabernet franc and Sauvignon blanc during the 17th century in southwestern France. Its popularity is often attributed to its ease of cultivation - the grapes have thick skins and the vines are hardy and resistant to rot and frost - and to its consistent presentation of structure and flavours which express the typical character ("typicity") of the variety. Familiarity and ease of pronunciation have helped to sell Cabernet Sauvignon wines to consumers, even when from unfamiliar wine regions. Its widespread popularity has also contributed to criticism of the grape as a "colonizer" that takes over wine regions at the expense of native grape varieties.

While not as prolific in mutating as Pinot noir or as widely used in production of offspring, Cabernet Sauvignon has been linked to other grape varieties. In 1961, a cross of Cabernet Sauvignon and Grenache produced the French wine grape Marselan. In 1977 a vine producing 'bronze' grapes was found in the vineyards of Cleggett Wines in Australia. They propagated this mutant, registered it under the name of Malian and have sold pale red wines under that name. In 1991 one of the Bronze Cabernet vines started producing white grapes. Cleggett registered this "White Cabernet" under the name of Shalistin. Compared to its Cabernet parent, Malian appears to lack anthocyanins in the subepidermal cells but retains them in the epidermis, whereas Shalistin has no anthocyanins in either layer.

The team that went on to discover the VvMYBA1 and VvMYBA2 genes that control grape colour have suggested that a gene involved in anthocyanin production has been deleted in the subepidermis of Malian, and then subepidermal cells invaded the epidermis to produce Shalistin. It is not unusual to have these kinds of 'gris' ("gray") and 'blanc' mutants of 'black' grapes: the Pinot and Grenache families are examples, although the 'Malian' deletion is bigger than the mutation found in Pinot blanc. (wikipedia)


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