Table 2 Cuticular conductance (gc) of Concord, Merlot, and Syrah grape berries at varying developmental stages. The gc was calculated as the rate of berry transpiration per surface area divided by the gradient of the mole fraction of water vapor between the ambient air and the berry apoplast (Equation 2). Data are presented as means ± SE (n = 5; 10 berries per replicate). Different upper case letters indicate significant difference among genotypes within each stage; different lower case letters indicate significant difference among stages within each genotype (p < 0.05, Fisher’s least significant difference test).