Figure 7.

Spatial Pattern of Anticlinal Divisions in the Cambium.

The positions of anticlinal divisions are altered in hybrid aspen plants expressing Ptt IAA3m cDNA. Positions of dividing cells within the cambial region were noted manually in relation to the phloem. Position 1 equals the cambial cell closest to the phloem. The graph shows the proportions of anticlinal divisions at different positions (divisions at the respective position per total number of anticlinal divisions). The differences in anticlinal divisions between the wild type and the two Ptt IAA3m lines were significant at positions 3, 4, 5, 6, and 8 (indicated by arrows) according to t tests (P < 0.05), indicating that the zone of anticlinal divisions was wider in the Ptt IAA3m lines than in the wild type.