Figures & data
Table 1. Developmental responses to auxin alone or in conjunction with other phytohormones
Figure 1. (A) A model for the comparison of developmental timing and PAT during embryogenesis and germination of a standard angiosperm, Arabidopsis, and a typical orchid. A. Arabidopsis establishes a clear primordial shoot and root during embryogenesis which can rapidly produce a radicle and young leaves during germination. (B) Embryos of orchid seed arrest development at a stage comparable to the globular stage of Arabidopsis embryogenesis. Early stages of germination in orchid are similar to late embryogenesis of Arabidopsis with the formation of a shoot, but root formation is considerably later in orchid germination. Shifts in auxin flow from an auxin organizing center plays a role in embryogenesis of Arabidopsis and regulates germination of orchid seeds.
