Grapevine Response to Soil Temperature: Xylem Cytokinins and Carbohydrate Reserve Mobilization from Budbreak to Anthesis

摘要: Potted Shiraz grapevines, in a glasshouse, were exposed to two different soil temperatures (13°C and 23°C) evaluate the effects on vegetative growth floral development from dormancy anthesis. Soil temperature had no effect time of budbreak, anthesis, or number flowers per inflorescence. At anthesis total biomass was similar for both treatments, whereas shoot greater warm soil. From root trunk decreased cool only warmer soil, but by twice as much that During decreases nonstructural carbohydrate accounted most decrease biomass. 14 cytokinins representing four recognized classes present bleeding sap, with trans-zeatin riboside isopentenyl adenosine dominant forms. Total active free base cytokinin concentrations while sap vines significantly lower nucleotide cytokinins. However, delivery treatment. By xylem almost 90% budbreak. Root-generated appear be associated mobilization reserves at end ensuing growth. Comparison results those previous studies reveals that, because apical dominance correlative inhibition, response terms buds break budbreak is conditioned nodes cane.