Figure 8.

Longitudinal and transverse sections of primary roots of wild-type and gna1 plants. The germinated seeds were grown at 32°C for 3 d, and then at 25°C for an additional 2 d. A and B, Longitudinal sections of wild-type (A) and gna1 mutant (B) seminal roots. C, Detailed examination of longitudinal section of the root elongation zone of gna1. Squares indicate the approximate regions from where the transverse sections were prepared. D to I, Transverse sections of different zones. Maturation zones of wild type (D) and gna1 (E); elongation zones of wild type (F) and gna1 (G); and meristem zones of wild type (H) and gna1 (I). Bars = 200 μm (A and B) and 20 μm (C–I). QC, Quiescent center; c, cortex; e, endodermis; p, pericycle; s, stele.