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EFFECT OF SEED PRIMING ON PHYSIOLOGICAL CHARACTERISTICS OF WHEAT SEEDLING UNDER SALT STRESS

SHI Yu-gang1 SUN Dai-zhen1 LEI Feng-jin2 YANG Jin-wen1 WANG Shu-guang1(1.College of Agronomy,Shanxi Agricultural University,Taigu,Shanxi 030801;2.Institute of Cotton,Shanxi Academy of Agricultural Sciences,Yuncheng,Shanxi 044000)  
In this study,two winter wheat varieties,Jinnong 207 with strong salt tolerance and Yunmai 218 with weak salt tolerance were taken as the tested materials,20% PEG and 100mmol /L KNO3 water solution were used to prime their seeds to study the effect of priming on germination of wheat seeds,salt tolerance and physiological characters of seedlings under stimulated salt stress.Results showed that the priming treatments both improved germination potential,germination rate,germination index and activity index of two varieties.Membrane permeability of two varieties significantly declined,while the contents of soluble proteins obviously increased.The salt tolerance index and salt tolerance ratio of the two varieties were improved to different degrees.Under salt stress by 100mmol /L NaCl,membrane permeability and contents of MDA of the two varieties decreased;the activities of POD,SOD and contents of RNA,proline,and soluble proteins were improved,indicating that seed priming enhanced salt tolerance of wheat seedlings by improvement of activities of antioxidant enzymes and the contents of osmotic regulatory substances and soluble protein.The study also revealed that seed priming had better effect on Yunmai 218 with weak salt tolerance than that on Jinnong 207 with strong salt tolerance,and generally priming effect of KNO3water solution was better than that of PEG.
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