RT Journal Article SR Electronic T1 Elevated Putrescine Levels in Grapevine Leaves That Display Symptoms of Potassium Deficiency JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 121 OP 125 DO 10.5344/ajev.1990.41.2.121 VO 41 IS 2 A1 Douglas O. Adams A1 Kenneth E. Franke A1 L. Peter Christensen YR 1990 UL http://www.ajevonline.org/content/41/2/121.abstract AB Markup server — Error Error There was a problem handling your request. Please try again in a few minutes, or contact us if you continue to experience this problem.