Effects of Salinity,Temperature and Their Interaction on Seed Germination Performance and Seedling Growth of Melon

Seed germination and seedling growth of melon were studied under five levels of salinity(0,50,100,150,200 mmol/L)stress and three temperature regimes(18,30,42 ℃).With the increasing of NaCl concentration,seed germination and seedling growth(Lateral root number,stem diameter and root length)of melon significantly decreased under same temperature.Seed germination at the moderate temperature regime of 30 ℃ was optimal,with 58% of seeds germinating in 200 mmol/L NaCl.The salinity inhibition for seed germination was the greatest at 18 ℃,and no seeds germinated above a concentration of 150 mmol/L NaCl.The order suppression of seedling growth under same salinity stress:30 ℃42 ℃18 ℃.It concluded that salinity,temperature and their interaction significantly affected the seed germination and seedling growth of melon.The effects on seed germination and seedling growth of melon at low than high temperature with the same salt stress,melon seed germination seedling growth response to salinity depends on the temperature,inhibition showed:18 ℃42 ℃30 ℃.