plant growth regulators includes auxins , gibberlins, ethylene, ABA, and cytokinines ., applications and functions of plan growtht regulators.

1. PLANT GROWTH
REGULATORS
DATE 10/2/2018
By
B.RAJESHWAREE NETHA
Pharm d 3rd year.

2. plant growth regulators
these are:
organic compounds
 contains endogenous (native) and exogenous
(synthetic) compounds
 helps in plant growth
 plant growth hormones includes
 auxins
 Gibberellin
 cytokinins
 Absesic acid
 Ethylene

3. Functions of plant growth hormones
 cell enlargement
 cell division
 cell differentiation
 organogenesis
 senensence
 dormance
 plant tissue culture technique
 produces secondary metabolites
 seed treatment to increase growth and root
development.

4. 1.Auxins:
• indicates "promotes elongation by coleoptile
tissue".
• two types- Natural and Synthetic
• Natural- IAA,IAN,PAA.
• Synthetic-IBA,NOA,NAA,NAD,2,4,D
• FUNCTIONS
• Internode elongation
• leaf growth
• initiation of vascular tissue

5. • Cambial activity
• fruit setting in absence of path
• fruit growth
• apical dominance
• Inhibition of root growth and lateral buds
• leaf abscission
• APPLICATIONS
• IBA+NAA --Rooting in cuttings
• IBA--Induce rooting in cuttings (cinchona,pinus,
papaya, coffee)

6. • derivatives of NAA--Increases 40% of volatile oil in
mentha piperata
• NOA-- Fruit setting spray
• 2,4-D at high concentration-- weed Killers
GIBBERLINS:
• endogenous type
• more than 50 in number
• 40 in Green plants
• 10 in fungi

7. • present in roots, shhots, leaves, fruits apics ,
callus etc.
• FUNCTIONS:
• More in medicinal plants
• flower initiation
• promotes vegetative and fruit growth
• induction of parthenocarpy
• breaking dormancy
• Gibberellins are produced from fungus on Rice
plant according to kurasawa.

8. • Gibberellins are compounds having hibbane
skeleton and biological activity in stimulating cell
division or cell elongation or both according to
paleg
• GA is a mixture of GA1, GA2, GA3, GA4, GA7,
GA9 according to research on Japan, USA, Britain.
• GA3 is called as Gibberlic acid
• GA are derivatives of Gibbane ring
• Ga is present in gymnosperms, angiosperms,
ferns, fungi, algae and bacteria

9. • Increases cell size
• APPLICATIONS:
• Increases digitalis and glycosides
• hormone on digitalis leaf and roots produce
digoxin
• senna have positive effect on dry weighr of
shoot and decreases sennosides in leaves
• increases height of castor but same in oil
content

10. • decreases alkaloids in vinca, datura
• indyce activity of gluconeogenic enzymes during
seed germination for convention of lipids into
sucrose for embryonic development
CYTOKININS:
 types natural (zeatin) helps in cell division anf
leaf senensence
 synthetic (kinwtin) helps in increase in lateral
buds and decrease senensence

11.  kinetin is produced from autoclaved herrinf sperm
DNA by miller which causes cell division in
tobacco
 FUNCTION:
 Increase cell division
 development of embryo during seed development
 expansion of cell in leaf discs and cotyledons
 Delay in bark of chlorophyll in aging leaves

12.  APPLICATION:
 In senna, increase sennosides , increase dry weight
of shot
 In opium, formation of elongated capsule, decrease
alkaloids
 In dubosia, increase in hyocyane and lead content
 kinetin, nucleac acid metabolism, protein synthesis
ETHYLENE:
 Present in ripening fruits, flowers, stems, roots,
tubers,and seeds about o.1 ppm

13.  produced by incomplete burning of c-rich
substance like natural gas, cosl, petroleum
 According to denny, lemons become yellow due
to stored gas
 ethylene produced from ripe Apples also ripes
green apples according to gane
 FUNCTION:
 Leaf ripening, induction of fruit absession
 leaf abs ission, bending
 stem swelling
 flower petals discoloration
 inhibition of stem and root growth

14.  promotion of flowering
 breaking dormancy
 stimulation of latex flow in rubber trees
 ABA
 ABA increases in stress conditions (injury,
drought, flooding, and mineral deficiency).
 seed dormancy
 acts as potential anti transpirant by closing
stomata when applied to leaves
 morphactins inhibit auxin Transport causing
reducing of apical dominance and promotes
lateral growth.

15. THE END