There’s a hive of PhDs at the University of California at Davis who are working to reinvent food production in the Golden State. Researchers have fanned out across the globe collecting rare plant samples; others are grafting Frankenstein trees and stitching together root systems of plums and peaches to create better almond and walnut trees. …. Whether in a sterile lab or in a dusty farm row, these projects are focused on one objective: saving water. In the midst of California’s extreme drought and scant water available for growers, the name of the game is how to produce more crop per drop.