Pierce's Disease
Research Updates

piercesdisease.cdfa.ca.gov

What is Pierce's Disease?

Pierce's Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

glassy-winged sharpshooter

Historical genetics: The parentage of Chardonnay, Gamay, and other wine grapes of northeastern France


  • Author(s): Boursiquot, J.; Bowers, John; Chu, Kieu; Johansson, Henrik; Meredith, C; This, P.;
  • Abstract: The origins of the classic European wine grapes (Vitis vinifera) have been the subject of much speculation. In a search for parental relationships, microsatellite loci were analyzed in more than 300 grape cultivars. Sixteen wine grapes that have long been grown in northeastern France, including Chardonnay, Gamay noir, Aligote, and Melon, have microsatellite genotypes consistent with their being the progeny of a single pair of parents, Pinot and Gouais blanc, both of which were widespread in this region in the Middle Ages. Parentage analysis at 32 microsatellite loci provides statistical support for these relationships.
  • Publication Date: Sep 1999
  • Journal: Science (Washington D C)