Evaluation of Drought Resistant of Different Processing Tomato at Seed Germination Stage under PEG-6000 Stress

To study the drought resistance of the seeds of 3 processing tomato under different PEG-6000 concentrations osmotic stress.The experiment set six PEG-6000 concentrations osmotic stress,which are respectively 0、5% 、7.5% 、10.0% 、12.5% 、15.0%;The seeds of processing tomato were treated under drought resistance and the seeds germination rate,germination potential,germination index,vitality index were measured.It was shown that(1) with the increasing of PEG concentrations,the germination rate,germination potential,germination index,vitality index,root fresh weight and dry weight,hypocotyl fresh weight and dry weight all decreased gradually.The change tendencies of different drought resistance among difference provenance were similar,but the range of changes was different remarkably;(2) under different osmotic potentials(PEG-6000) to evaluate their drought resistance using the fussy subordinate function,the results indicated that the drought resistance of the 3 processing tomato decreased in the order as: KT-16,KT-18,KT-70;(3) the drought resistance index could better reflect the differences among different processing tomato under PEG concentrations osmotic stress and could be used as a filtrating method appraising drought resistance in processing tomato germination stage.