| Abstract: | Hierarchy in the plant clock shop Higher plants use an endogenous timekeeper, the circadian clock, to adjust to the periodic changes in light and darkness in their environment. It has long been assumed that plant cellular clocks act as stand‐alone systems. Recent evidence points to widespread coupling among clocks in different organs and different cells. Moreover, a hierarchy has been observed between clocks in leaves and roots and even between clocks in individual cell types of the leaf, with the clock in the vasculature being dominant over the clock in mesophyll cells. Thus, the plant circadian system may also show a hierarchical organization reminiscent of the clock system in mammals. |
