VIP Call Girls Mumbai Arpita 9910780858 Independent Escort Service Mumbai
Cultivation of medicinal plants by Seed / Sexual Propagation
1. Cultivation Of Medicinal Plants by
Seed Propagation / Sexual Propagation
PREPARED BY,
Ms. M.S. Divya Sree, M.Pharm,
Assistant Professor,
Department of Pharmacognosy,
Sree Vidyanikethan College of Pharmacy,
Tirupati, Andhra Pradesh.
3. Seed /sexual Propagation
• Plants raised from seeds – seedlings
• Drawbacks
a)Loss through transplantation.
b)Failure to germinate (very slow or no
germination).
4. Germination failure is mainly due to
i) Natural chemical inhibitors.
ii) Physical inhibitors.
Natural chemical inhibitors
Treat – soaking with chemical reagents like H2So4/water
to specific period – depending on the type of the seed.
Hard coat seeds – soak in 0.2% gibberlic acid for 48 hrs.
Ex: Henbane, castor seeds – with H2So4.
5. Physical inhibitors
By abbration techniques - treat with coarse sand or
stones.
By removing testa of seeds(partial or complete removal)
- It should be done carefully without disturbing the
embryo of the seed.
Ex: Indian senna.
When the seeds are prepared, they should be
evenly distributed / spread over the seed bed.
6. There should be proper contact between seeds
and soil.
(For this a small layer of soil should be placed
between the seeds)
If any plantation is done in the polythene bags
then care should be taken to maintain proper
moisture in the soil.
Seed sown – depth 2-3 / 2-4 cm.
7. Seeds – shouldn’t sow very deep –
germination doesn’t take place
3-5 seeds in single hole(small) & cover with
single layer of soil.
When seedlings come up with 2-4 leaves,
stronger one can be selected.
Other seedlings can be removed.
8. Methods of seed propagation
A. Broad casting
B. Dibbling
C. Drilling
D. Nursery bed
10. Broad casting
Method of seeding - involves scattering seed, by hand or mechanically
over a relatively large area.
Seed is placed at a precise spacing and depth.
For extremely small seeds.
This process involves direct sprinkling of seeds into the soil.
Seeds sown in this manner are distributed unevenly (which may result in
overcrowding).
Also this method may not ensure that all seeds are sown at the correct
depth .
Ex: Isapgol, sesame, linseed
11. Dibbling
• Seeds – average size and weight.
• Making small holes in the ground for seeds or
plants.
• 3-5 seeds (in single dibble).
Ex: Groundnut, Castor, Cotton, nutmeg.
13. Drilling
• The sowing is done through seed drills/seed cum
fertilizer drill.
• The seeds are covered by wooden plank or
harrow to have contact between seed & soil.
• Seeds are dropped at uniform depth and results
in uniform germination and regular stand
Ex: Jowar, wheat, maize
14.
15. Nursery beds
• Plant your seeds in rows. The lines must face
where the sun raises from.
• Make the lines at a spacing of 15 cm apart.
• Use a string to make straight lines.
• The line must be 2 cm deep.
• The seeds will start germinating after 5 – 7 days.
16.
17. Advantages
• It is the simple and cheap method and can be employed by
the growers at their own fields.
• Plants produced are hardy and have strong root system.
• When the plant cannot be propagated through vegetative
means, then it is the only method of propagation.
• Many commercial cultivars originated as chance seedlings.
• Hybridization work depends upon seed germination.
18. Disadvantages
• Plants raised through seeds have long juvenile period.
• It takes long time to fruiting.
• The seedling trees have very deep root system hence
the trees attain big size at maturity.
• Some viruses are seed borne.
• Some seedless fruits cannot be propagated through
seed.