VINEYARD MANAGEMENT PRACTICES AND THE QUALITY OF GRAPES AND GRAPE PRODUCTS IN THE PACIFIC NORTHWEST
Location: Horticultural Crops Research
Title: Impact of Grapevine leafroll associated virus -2 and -3, on primary and secondary metabolites: commercial vineyard example
Submitted to: Oregon Wine Research Institute
Publication Type: Abstract Only
Publication Acceptance Date: December 15, 2010
Publication Date: February 11, 2011
Citation: Lee, J., Martin, R.R. 2011. Impact of Grapevine leafroll associated virus -2 and -3, on primary and secondary metabolites: commercial vineyard example. Oregon Wine Research Institute Viticulture and Enology Research Colloquium. Meeting Booklet.
Making fine wine begins in the vineyard with the production of high quality fruit. Viruses, such as Grapevine leafroll associated viruses (GLRaVs), can have negative impacts on both vine productivity and fruit quality. Recent reports on the incidence and spread of GLRaVs in vineyards in Oregon and Washington led to our study of the effects these viruses had on phenolics (anthocyanins, phenolic acids, tannins, etc), organic acids, sugars, and nitrogen containing compounds (ammonia, free amino acids, and polyamines) in 'Pinot noir' obtained from commercially operating Oregon vineyards. We will present our findings of the impact of GLRaV on numerous primary and secondary metabolites in 'Pinot noir' berries. Three different rootstock/scion combinations were included in this study. Clusters were collected for two growing seasons. Although a controlled field experiment is currently underway, these results demonstrated a decrease in berry anthocyanins, total phenolics, total tannins, from infected vines from Vitis riparia rootstock/'Pinot noir' clone scion compared to their healthy counterparts. In general, no significant differences were observed in yeast assimilable nitrogen, sugars, organic acids, or polyamine content between the infected and healthy clusters, but levels differed for berries taken from healthy vines between the three different rootstock/scion combinations.