Hormones Flashcards
Auxin where produced and found in plant
Embryo of seeds
Meristems of apical buds
Young leaves
Major function of auxin
Stimulates stem enlogation, root growth, cell differentiation
Enhances apical dominance in photosynthesis
Promotes xylem differentiate retards leaf abscission
Cytokinins where is produced and found in plant
Synthesised in roots and transported to other organs
Major function of cytokinins
- Affect root growth and differentiation -Stimulate cell division and growth
- Stimulate germination
- Delay senescence
Gibberellins where produced and found in plants
Meristems of apical buds and roots, young leaves and embryos
Gibberellins major function
Promotes seed and bud germination, stem enlogation and leaf growth
Stimulates flowering and development of fruit
Affect root growth and differentiate
Brassinosteriods where found and produced in plants
Seeds, fruit, shoots, leaves and floral buds
-Inhibit root growth
Brassinosteriods major function
- Retard leaf abscission
- Promote xylem differentiation
- Inhibits root growth
Abscisic acid where found and produced in plant
Leaves, Stems, roots, green fruit
Abscissa acid major function
- Inhibits growth
- Closes stomata during water stress
- Promotes seed dormancy
Ethylene where produced and found in plants
Tissue of ripening fruit, nodes of stems, aging leaves and flowers
Ethylene major functions
- Promotes fruit ripening, opposes some auxin effects
- Promotes or inhibits growth and development of roots, leaves and flowers depending on species
Plant hormones and their function
- necessary for but do not control growth
- they are intercellular messages for control of the plant life cycle
- they help the plant react to environmental factors
