Physiological Response of Sweet Sorghum Under Drought Stress and Comparison of Drought Resistance
To explore the physiological and ecological response mechanism of different sweet sorghum varieties and screen better sweet sorghum restorer lines under drought stress,PEG-6000 aqueous solution with concentration gradients of 50 g/L,100 g/L,150 g/L and 200 g/L was set in this study,and water treatment was used as a control.The germination rate,germination potential,germ length,radicle length,radicle dry weight,germ dry weight and dry matter transport rate of different treatments were measured.The result showed that germination rate,germination potential,germ length,radicle length and dry matter transport rate all showed a downward trend with the increase of PEG concentration.Under different treatments,the germination potential of variety 2 and variety 7 showed the best performance,and did not decrease significantly under the concentration less than 200 g/L,and decreased by 11.5％and 17.8％compared with the control under the concentration of 200 g/L.The germination rate of cultivar 7 showed the best performance,and decreased the least(5.6％)under the treatment of 200 g/L PEG concentration.The radicle length of cultivar 6 showed the best performance and increased by 7.1％under concentration of 150 g/L.The germ length of cultivar 3 and cultivar 4 showed the best performance,and decreased the least compared with the control under concentration of 100 g/L and 150 g/L.The dry matter transport rate of cultivar 2 showed the best performance,and showed the least decrease under all treatments compared with the control.Different sweet sorghum varieties showed different response mechanisms on drought stress.According to the comprehensive evaluation of drought resistance by membership function,the order of drought resistance of 8 sweet sorghum lines was variety 3＞variety 7＞variety 4＞variety 6＞variety 2＞'variety 5'＞'variety 8'＞'variety 1'.
sweet sorghumdrought stressdry matter transport ratemembership function
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