Effects of saline stress on seed germination and seedlings properties of three types' rapeseeds.

【Objective】The study was conducted to understand the salt tolerance of Brassica rapa,Brassica napus and Brassica juncea,which will provide a reference for the rape salt tolerance breeding.【Method】Thirty cultivars belonging to three varieties of rapeseeds(10copies of each type)were treated with 5 concentrations(0.75,1.7,2.7,3.7,5g/L) of NaCl in seed germinating.The seedlings treated with 3.7g/L NaCl were cultivated in sand culture,and the effects of saline stress on seedlings properties were observed.【Result】The germination rate of seeds decreased with increasing concentration of NaCl.The seed germination rate of Brassica rapawas the best,followed by Brassica napus,Brassica juncea was the worst.B.napus was better in growth than B.rapaand B.junceain the seedling length,root length,fresh weight,and chlorophyll content,but the effects of saline stress of B.napus were the greatest on the seedling length,fresh weight,and chlorophyll content.Its salt tolerance was worse than B.rapaand B.juncea.1021,821 and X6-W94 had the best salt tolerance in B.rapa,B.napus and B.juncea,respectively through comparison.【Conclusion】The material 1021belonging to B.rapa,the material 821 from B.napus and the B.juncea material X6-W94 are better salt tolerance materials,which could be used in the salt tolerance breeding and molecular mechanism.