Figure 7.

Plum fruit development, maturation and ripening “on-tree.” Fruit volume (A) and flesh firmness (B) changes during maturation and ripening “on-tree” of the California plum cultivar “Santa Rosa” and the “Santa Rosa”-derived bud sport mutants: “Late Santa Rosa,” “Roysum,” “Casselman,” and “Sweet Miriam,” Arrows indicate the developmental stages defined in the text. The horizontal dotted line marks the 30- and 10-N thresholds of the commercial maturity (S4-1) and “ready-to-eat” (S4-2) developmental stages (Crisosto, 1994). Numbers with asterisks at the bottom of the plate (B) indicate the degree-days after full bloom (Grossman and DeJong, 1995). The vertical bars in each particular figure represent the least significant difference (LSD, P = 0.05).