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