FRUIT CLUSTER THINNING, SHADIHG, AND DEFOLIATION ON FRUIT COLOR DEVELOPMENT OF RELIANCE GRAPES

in HortScience
Authors: Yu Gao1 and G. A. Cahoon1
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  • 1 Department of Horticulture, OARDC/The Ohio State University, Wooster, Ohio 44691

Significant differences in fruit color were created with fruit cluster thinning (20, 40, and 60 clusters/vine), cluster shading (full sun as control, 55% shading, and 95% shading using shading cage constructed of shade cloth), and defoliation (3, 6, 9, 12, and 15 leaves/cluster). Fruit cluster shading and defoliation treatments decreased red fruit color (characterized by Hunte Color a). Fruit cluster thinning increased red fruit color. Anthocyanin profile of Reliance grape was characterized as cyaninidin-3-glucoside and delphinidin-3-glucoside using Paper Chromatography and Thin Layer Chromatography. Analyses of total anthocyanin content (pH shift method), individual anthocyanin and soluble carbohydrates content (High Performance Liquid Chromatography), are being conducted to determine effects of carbohydrate allocation to fruit and sun light on fruit color of Reliance grapes.

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