Home > Cytokinin

Examples: kinetin , zeatin , benzyl adenine .

1 Location, Characteristics and Occasions for Synthesis Induction

• Synthesized in root and shoot meristematic tissue
• Synthesized in meristematic regions of roots
• Synthesized in mature roots – small amount
• Rapid transport in xylem stream
• CK activity reduced in plants suffering drought
• Peaks during the day
• Synthesized in mature shoot cells
• Released by meristematic cells when they have enough minerals and water to support both themselves and any dependent cells
• Released by all cells when they are experiencing conditions which would normally cause a shoot meristematic cell to produce CK
• Directly or indirectly induced by high levels of GA/BA

2 Effects

• CK promotes Chlorophyll production and leaf unrolling
• CK promotes photosynthesisPhotosynthesis is a biochemical process in which plants, green algae, and some bacteria use the energy of light to combine water and carbon dioxide into oxygen and energy. It nourishes nearly all living things directly or indirectly, making it vital to li
• Stimulates cell broadening
• Also promotes shoot formation
• Also promotes the unloading of sugar from phloem
• Causes the outgrowth of secondary shoot buds – breaks shoot apical dominance/ lateral bud development
• Delays leaf senescence
• Stimulates cell division with AuxinAuxins are a group of plant growth substances (often called phytohormones or plant hormones), the most common example being indoleacetic acid (IAA), responsible for raising the pH around cells, making the cell wall less rigid and allowing elongation.
• Involved in morphogenesisMorphogenesis (from the Greek morph shape and genesis creation) is one of three fundamental aspects of developmental biology along with the control of cell growth and cellular differentiation. Morphogenesis is concerned with the shapes of tissues, organs
• Promotes stomatal opening
• Induces xylem and phloemIn vascular plants, phloem is the tissue that carries organic nutrients, particularly sucrose. In trees, the phloem is part of the bark, hence the name, derived from the Greek word for "bark". See also xylem. Phloem sap moves from sugar source''s to sugar
• Directly induces GA/BA at high levels
• Inhibits C4 Photosynthesis
• (From Theory II) Stimulates the rate of metabolismMetabolism in the most general sense, is the ingestion and breakdown of complex compounds, coupled with the liberation of energy, and the consequent generation of waste products. It is major process of living organisms, and because this process can happen of cells in the shoot (who are not at their peak metabolism rates) in response to an increase in the levels minerals and water