Analysis on drought resistance of leaves of barley seedling under the condition of PEG osmotic stress

The relative water content,Pro content,POD and other physiological ndicators in the leaves of barley seedling were measured with the varieties of Ganpi No.4,Harrington and D-22 as materials under the condition of drought stress set with PEG6000.The results showed that for all materials,by the increasing of PEG 6000 concentration,the relative water content decreased but the relative conductivity,MDA,prolines and POD,four other ndicators showed an increasing trend.All the indicators tested changed small under the teatment of low PEG concentration.But their changes became big as the treatment concentration increased.However,,there were large differences between different the materials.At the treatment of 25% and 30% PEG concentration,compared with no PEG treatment,the water content of D-22 blades reduced 53.2% and 58.5% respectively,proline content increased 91.9% and 92.4%,relative conductivity enhanced 62.8% and 73.5%,MDA increased 54.1% and 61.2%,respectively,while the water content of Ganpi No.4 blades reduced only 24.3% and 42.4% respectively,proline content increased 34.2% and 58.0%,relative conductivity enhanced 72.3% only at the treatment of 30% PEG,the performance of Harrington was between them.For the POD activity,Ganpi No.4 was highest with D-22 lowest.Conclusion:the ability of Drought resistance for the materials is Ganpi No.4 beer 4HarringtonD-22.