Figure 1.—

Chromosome territory organization in differentiated and meristematic A. thaliana tissues. (A–F) Differently labeled probes for the top (red) and bottom (green) arm of chromosome AT2 were hybridized to A. thaliana seedlings. Possible arrangements of homologous arm territories are shown for part of a differentiated primary leaf (A, with premature trichomes), for a pair of guard cells (B, sister cells s1 and s2), for part of a differentiated primary root (C, front view), for a root hair (D), and for shoot- and root-tip meristematic cells (E and F, respectively). (G) Association of homologous or heterologous chromosome territories for AT3 (yellow), AT4 (green), and AT5 (red) was analyzed in meristematic root-tip nuclei. Bars, 5 μm.