Plant Hormone Cytokinins: Major Functions

• Natural- Zeatin and di-phenyl urea
• Dihydrozeatin (DHZ) is a naturally occuring cytokinin 
•  Sythetic –kinetin
• Coconut milk is rich in cytokinins

Synthesis : Aminopurine derivatives

Major effects

•     Cell division
•     Cell elongation
•     Speed up chloroplast maturation
•     Cytokinins auxin ratio for rooting and shooting in tissue culture

Auxin:Cytokinin Ratio

•     Overcome apical dominance exerted by auxin
•      Delay senescence and  increase shelf life
•      Helps to mobilize solutes and other nutrients

What are pomalins?  A combination of cytokinins and gibberrillin is effective in increasing apple size

Major site of production: root apical meristem