Seed priming
- 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..
- 3. Methods of seed priming Osmopriming Hydro priming Halo priming Hormonal priming
- 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