Figure 1.

Developmental patterns of essential oil accumulation in grapefruit peel. A, Fruit growth in 2009 (white circles) and 2010 (black circles). B, Oil gland formation in 2009 (white circles) and 2010 (black circles). C, Prolate spheroid shape of secretory cavities in peel of young fruit (28 mm ED). D, Spheroid shape of secretory cavities in peel of mature fruit (100 mm ED). E, Oil yield as a function of fruit development (estimated based on cavity volume measurements as white diamonds and measured by chemoanalytical means as black diamonds). F, Peel surface in young fruit (28 mm ED). Mostly small and medium-sized cavities are visible. G, Peel surface in mature fruit (100 mm ED). Almost all cavities are fairly large. H, Volume distribution of cavities as a function of fruit development.