Location: Horticultural Crops Research2012 Annual Report
1a. Objectives (from AD-416):
Objective 1: Determine effects of water management on wine grape productivity and fruit maturity. Objective 2: Integrate the development and use of analytical methods for the evaluation of phenolic compounds and other chemical indicators of quality in fruit, fruit products, and wine. Objective 3: Determine effects of vineyard and vine microclimate on fruit development, vine productivity, and fruit quality, particularly phenolic compounds.
1b. Approach (from AD-416):
Our fundamental approach for conducting the proposed research is based on interdisciplinary work toward grape production systems and connecting production practices to the quality of the harvested fruit or value-added fruit products. Although each team member is responsible for a distinct experimental focus, overall goals and responsibilities of the contributors overlap because the interactions among system processes and properties transcend disciplines.
3. Progress Report:
ARS researchers in Corvallis, Oregon, and Parma, Idaho, clarified the confusion surrounding Rubus fruit phenolic research (e.g., misidentification of black raspberry ACYs (anthocyanins) followed by animal metabolomics study monitoring these misrepresented compounds) by identifying errors in Rubus fruit phenolic research, and how these confounding and incorrect results were derived. We completed the documentation of a computer model to predict the cold-hardiness of grapevines during winter in Washington state. Adaptation of the model by our collaborators now allows grape growers internet- and smart-phone access to estimates of the low temperatures at which there could be damage in their vineyards. We collaborated with scientists at Oregon State University and other ARS programs to investigate the influence of a clay-based foliar reflectant on heat stress in wine grape. In 2011 we published results from two years of trial data showing that the particle film did not alter grape aroma volatiles. Grape aroma is of interest to the wine grape industry because of its strong influence on wine quality. In 2011, we completed in collaboration with scientists at Boise State University, Washington State University, Brock University, Ohio State University, Agri-Food Canada and other ARS researchers, year replications of multiyear field trials designed to evaluate differences among wine grape cultivars in response to drought and tolerance to cold. Results from these multiyear trials will provide new information useful to wine grape growers who want to customize cultural practices for different winegrape cultivars.