Cai Hua

Stress of NaCl and Na2CO3 on seed germination of Bromus cartharticus Vahl new strain.

Seed germination of the salinetoloerant Bromus cartharticus Vahl new strain was studied on the condition of neutral and alkaline salt.NaCl and Na2CO3 were applied at concentrations of 0.2%,0.4%,0.6%,0.8%,1.0% and 1.2% for salt stress treatments.The relative germination percentage,germination index and vigor index of Bromus cartharticus Vahl declined with increased salinity.In 0.2%~0.8% NaCl concentrations,the neutral salt had the promoter action to the radicle length.Its length increased about 40.2% while the amplitude of variation reduced with the increase of the concentration.The length of embryo root was greatly restrained under Na2CO3-stress.A large number of non-root plants occurred.The regression analysis was carried by the relative germination percentage under two different kinds of single-salt stress.The preference value,critical value and ultimate value of Bromus cartharticus Vahl new strains seeds were 0.65%,1.14% and 1.93% respectively under NaCl stress,compared to the Na2CO3 stress under various values(0.38%,0.71% and 1.24%).The ability of Bromus cartharticus Vahl new strains seeds to bear the neutral salt(NaCl) stress was stronger than alkaline salt(Na2CO3) if all germination indicators were all considered.