Plant Growth & Development and Plant Hormone
Sigmoid curve
Plant Hormones
Characteristics
5 stages
transitional
maturity
juvenile
senescene
embryonic
Meaning: small organic compounds that influence physiological at very low concentrations.
click to edit
5 Plant Hormones
Gibberellin
Abscisic acid
Ethylene
Auxin
influence physiological at very low concentrations
Can simulate or inhibit plant growth
growth
Development
Reproductive growth
Flower Induction
Pollination
Fertilization
Fruit Formation
Fruit Ripening
Change in complexity that accompany growth
Change in function
Change in shape
Increase in body mass
Increase in number of cell
Increase in size
Early stage for seed to germinate when the condition is suitable
Plant undergoes vegetative growth without reproductive activities
Plant start to show their characteristic. etc: their leaves
Plant start to show their final stage like flowering and fruiting.
Cytokinins
Stimulate lateral bud growth , delay aging and death
Stimulate stem elongation , induce parthenocarpic in seed development , promotes maleness
Stimulate the closure of stomata , promotes dormancy in buds and seeds
Gas found in the tissue of ripening fruits and stem nodes
regulates phototropism, gravitropism , promotes stem growth , stimulate root growth
Transfer of pollen grains to the stigma from the anther to the stigma of flower
1- Self pollination
2- Cross pollination
Not directly involved development process but act at low concentrations
The physiological process in the plant by which the shoot apical meristem becomes competent to develop flowers.
Fertilization is a process of sexual reproduction in plants, which occurs after pollination and germination.
One of the organs that remains on the plant after pollination and fertilization is the ovary.
Ripeness brings out the best flavor, texture, textand even an appetizing smell.
Plant start to dying.
E.g: Plant increases in the number and size of leaves and stems
E.g: Primary root transform into adventitious root
Location: Shoot tips, terminal buds, young leaves and flowers.
Location: Shoot apex, embryonic tissue.
Location: leaves, stems, and green fruits
Location: Tissue of ripening fruits and stem nodes
Location: meristemic cell, embryonic tissue
e.g
e.g
e.g
e.g
2,4 D ( Dichlorophenoxyacetic acid )
IBA ( Indole-3-butyric acid )
IAA ( Indole-3-acetic acid ) (natural)
NAA ( naphthaleneacetic acid ) (synthetic)
Ethylene (natural)
Ethaphon (synthetic)
benzoic acid (natural)
daminozide (B-9 , synthetic)
e.g
Gibberellin acid (GA3)
zeatin , kinetin (natural)
benzyladenine (BA)
pyranylbenzyladenine (PBA)