Research on Physiological Response to Water Stress in Tomato Seedling

To research the physiological effect of tomato to water stress,the contents of Pro,MDA and H2O2 and the activities of SOD,POD,CAT and APX of two different gene-type tomatoes,Solanum pimpinellifolium ‘L03708'and Solanum lycopersicum ‘M82'were examined,under Hoagland nutrient solution with 15%(w/v)PEG 6000.The results showed that the leaves of‘L03708'lost less water than leaves of‘M82';the content of Pro in‘L03708'was significantly higher than that in‘M82'during 1hour to 48hours;the contents of MDA and H2O2in‘L03708'were lower than that in‘M82',while SOD,POD,CAT and APX activity were higher than that in ‘M82'during 1hour to 72 hours under water stress.The experiment results suggested that the drought tolerance of tomato seedling may due to the produce of more osmotic regulation substances which could maintain osmotic regulation ability,and more activity of antioxidant enzyme which could reduce the oxidation reaction of the cell membrane.