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It came as little surprise when DNA fingerprinting techniques revealed that 16 venerable wine-grape varieties, including Chardonnay, Aligote and Gamay noir, are the direct offspring of the classic Pinot variety.
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The crown gall pathogen survives systemically within the grapevine and causes disease at wounded areas on the vine (Lehoczky, 1968). There are both tumorigenic and nontumorigenic strains of A. vitis found on grape (Burr et al, 1998).
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GENE detectives say that the grape that produces the Californian red wine Zinfandel does not originate from southern Italy as most people believe. It is probably the offspring of an unidentified Croatian grape. Grape varieties are developed by hybridising different "parent" vines.
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