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Effect of Na Cl Stress on Seedling Biomass and Photosynthetic Characteristics of Barley

LIU Zhi-ping;XU Shou-jun;ZHANG Feng-ying;BAO Hai-zhu;MENG Fan-hao;Inner Mongolia Autonomous Academy of Agricultural and Stockbreeding Sciences;Inner Mongolia University for The Nationalities;  
This article studied the seeding biomass,salt injury index and photosynthetic characteristics of barley under different concentration of Na Cl stress based on the testing materials of salt resistant 12pj- 118 and salt sensitive 12pj- 045. The results indicated that with the increase of Na Cl concentration,two varieties' fresh weight,dry weight,relative fresh weight and relative dry weight had a downward trend. Under different concentration of salt stress,fresh weight and dry weight of salt tolerance 12pj- 118 fell less than salt sensitive 12pj- 045. Their relative fresh weight and relative dry weight were greater than 12pj- 045. Moreover,their salt injury index was significantly lower than 12pj- 045. It's indicated that the salt resistance of 12pj- 118 was better than another' s. Under the radiation intensity of a given simulation light 1 000μmol / m2/ s,with the increase of concentration of Na Cl,the net photosynthetic rate( Pn),stomatal conductance( Gs),transpiration rate( Tr) and chlorophyll content of these two varieties had a downward trend. Moreover,the change of two varieties' intercellular CO2concentration( Ci) was inconsistent. Under high concentration of salt stress,,the Pn,Gs,Tr and chlorophyll content of 12pj- 118 declined less than salt sensitive 12pj- 045.
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