2. Seed priming
Seed priming is used by seed producers and
growers to control germination
Mainly seed priming is used to shortern
germination time,also promotes more yield and
enhanced product quality..
4. Hydro-priming
Hydro-priming involves soaking the seeds in water before sowing (Pill and
Necker, 2001) and may or maynot be followed by air-drying of the seeds.
Although soaking seed in water and drying before sowing is the easiest way to
achieve hydration
disadvantage
it may result in uneven hydration and non-uniformgermination.
Soaking is not suitable for some plant species, as rapid hydration may cause
leakage of essential nutrients
Overcome by: seed humidification -- seed are treated under conditions of high
humidity
5. Halo priming
Halo priming refers to soaking of seeds in solution of inorganic salts
i.e. NaCl, KNO3 CaCl2, CaSO4, etc
Results:
improvement in seed germination, seedling emergence and
establishment, and final crop yield in salt affected soils in response
to halopriming..
6. Osmopriming..
This is also known as osmo-conditioning
In this technique, seeds are soaked for a certain period in solutions of sugar,
polyethylene glycol (PEG), glycerol, sorbitol, or mannitol followed by air drying
before sowing.
Benefits:
Osmo priming not only improves seed germination but also enhances general crop
performance under non saline or saline conditions, osmo- conditioning of Italian
ryegrass and sorghum seeds with 20% PEG-8000 for 2 days at 10oC enhanced
germination rate, water-stressed ,water logged, cold-stress, or saline conditions .
7. Hormonal priming
Hormonal priming is the pre seed treatment with different hormones i.e. salicylic
acid, ascorbate, kinetin,etc. which promote the growth and development of the
seedlings.
benefits
GA3 treatment enhanced the vegetative growth of two wheat cultivars under but
caused a slight reduction in their grain yield. GA3 treatment enhanced the
deposition of Na+ and Cl- in both root and shoots of wheat plants under prevailing
field conditions. It also caused a significant increase in photosynthetic activity in
both lines at the vegetative stage of the
