Ethylene is a natural plant hormonereleased by the fruit as it ripens. Use ofethylene gas speed up the ripening of thefruits. lt is the only scientific and saferipening method accepted worldwide andapproved by the Government. lt does nothave any effect on the aroma and flavor ofthe fruit. Ethylene promotes ripening offruits like banana, mango, papaya, mudapple pineapple, orange, sweet lime(mosambi) etc.