Flower abscission and inflorescence carbohydrates in sensitive and non-sensitive cultivars of grapevine

摘要: The Gewurztraminer (GW) and the Pinot noir (PN) cultivars of grapevine differ in their sensitivity to environmental factors that can cause flower abscission, cv. GW being most sensitive. In order further define mechanisms leading owing importance sugars achievement sexual organ ontogenesis, we attempted correlate chronology ontogenesis with variations carbohydrates inflorescence. vineyard, under optimal climatic conditions, fruit set PN was 82% 65%, respectively. sugar distribution different inflorescences during entire duration development. Between stages 15 17, flowers reached crucial meiosis stage. At time, exhibited higher concentrations starch sucrose, whereas those presented levels glucose fructose. Despite inflorescences, reserves were present ovules anthers but not GW. These results suggest content reserve transport favour development conditions. Furthermore, since represents a key step female development, two at 17 could be related abscission stress. particular, presence granules might explain resistance this cultivar abscission.