Project Number: 5358-21000-034-17
Project Type: Grant

Start Date: Jul 25, 2005
End Date: Sep 30, 2008

Objective:
Determine the physiological mechanisms by which `Concord¿ vines in central WA vineyards accumulate enough total iron in leaves, yet develop chlorosis. Develop practical solutions to overcoming the chlorosis problem of `Concord¿ in WA vineyards. Develop a new test to measure physiologically active iron in `Concord¿ grape leaves for diagnosis of Fe-deficiency.

Approach:
We will first collect both chlorotic leaves and normal leaves from 3 `Concord¿ vineyards in WA to confirm that chlorotic leaves have lower active Fe than normal leaves, then: 1. Determine the physiological mechanisms by which `Concord¿ grape leaves accumulate the same or even high level of total iron, yet develop chlorosis, on high pH soils; 2. To determine the effectiveness of FeEDDHA application on alleviating Fe-deficiency induced chlorosis in `Concord¿ vines in a pot study at pH 8.0 and in a vineyard in central WA; 3. Determine the tolerance of rootstocks to Fe-deficiency for `Concord¿ and the mechanism of tolerance; 4. Develop a new diagnostic test to measure physiologically active iron in `Concord¿ grape leaves. Documents Grant with Cornell University.