The LAX3 gene promotes the formation of these structures and the observation of groups of three pericycle cells has led to the hypothesis that three is the minimum number of cells for initiating primordia of them.
The LAX3 gene promotes the formation of these structures and the observation of groups of three pericycle cells has led to the hypothesis that three is the minimum number of cells for initiating primordia of them. These structures contain columella cells which contain amyloplasts and secrete mucigel. One theory on the Late Devonian Extinction involves a major increase in the biomass of these structures, which form before the plumule. A type of these is pneumatophores, which form to obtain oxygen. Adenine-type cytokinins are produced in the meristem of this organ, and mycorrhizae is the symbiosis of fungus and this organ. Contrasted with shoots, for 10 points, name these below-ground portions of plants that absorb water and nutrients.
The LAX3 gene promotes the formation of these structures and the observation of groups of three pericycle cells has led to the hypothesis that three is the minimum number of cells for initiating primordia of them.
roots 