Question: where does the vascular cambium get its energy to produce more xylem and phloem

title: Vascular cambium
text: Auxin hormones are proven to stimulate mitoses , cell production and regulate interfascicular and fascicular cambium . Applying auxin to the surface of a tree stump allowed decapitated shoots to continue secondary growth . The absence of auxin hormones will have a detrimental effect on a plant . It has been shown that mutants without auxin will exhibit increased spacing between the interfascicular cambiums and reduced growth of the vascular bundles . The mutant plant will therefore experience a decreased in water , nutrients , and photosynthates being transported throughout the plant , eventually leading to death . Auxin also regulates the two types of cell in the vascular cambium , ray and fusiform initials . Regulation of these initials ensures the connection and communication between xylem and phloem is maintained for the translocation of nourishment and sugars are safely being stored as an energy resource . Ethylene levels are high in plants with an active cambial zone and are still currently being studied . Gibberellin stimulates the cambial cell division and also regulates differentiation of the xylem tissues , with no effect on the rate of phloem differentiation . Differentiation is an essential process that changes these tissues into a more specialized type , leading to an important role in maintaining the life form of a plant . In poplar trees , high concentrations of gibberellin is positively correlated to an increase of cambial cell division and an increase of auxin in the cambial stem cells . Gibberellin is also responsible for the expansion of xylem through a signal traveling from the shoot to the root . Cytokinin hormone is known to regulate the rate of the cell division instead of the direction of cell differentiation . A study demonstrated that the mutants are found to have a reduction in stem and root growth but the secondary vascular pattern of the vascular bundles were not affected with a treatment of cytokinin .