Morphological analysis of sweet orange trees. A) Images showing the appearance of the sweet orange trees in the experimental orchard. Image on the left: general view of the sweet orange trees (from the P2 to P8 lines) distributed in a row in the orchard; image on the right: size comparison between juvenile and adult trees. B) Effects of the ‘line’, ‘transgene’ and ‘ontogeny’ factors on the morphological variables Tree height and Tree canopy volume. The data represented in the notched box-and-whisker plots were calculated from measurements recorded over the course of two years (2004 and 2005) at the end of the growing season. K-W, Kruskal-Wallis test (n = 48); M-W, Mann–Whitney tests; A, all adult lines (n = 36); J, all juvenile lines (n = 12); C, all control lines (n = 16); T, all transgenic lines (n = 32).