Effects of Saline-alkali Stress on Seed Germination of Carthamus tinctorius L.

[Objective] To research the physiological response of Carthamus tinctorius L.under saline-alkali stress,so as to screen,introduce and cultivate new varieties.[Methods] With C.tinctorius seeds as the research material,saline-alkali stress treatments by different concentrations of NaCl,NaHCO;,NaCl and NaHCO;（1∶1） mixed solutions were carried out.The saline-alkali tolerance abilities were researched by detecting the germination percentage,germination energy,relative germination percentage,vigor index and so on.[Results]With the concentration increase of Na Cl,NaHCO;,Na Cl and NaHCO;（1∶1） mixed solutions,the germination percentage,germination energy,relative germination percentage,radical length and seedling fresh weight of C.tinctorius seeds gradually declined.Under Na Cl stress,the salt-tolerance concentration,median inhibitory concentration and limiting concentration of C.tinctorius seeds were 9.663‰,14.721‰ and 19.779‰,respectively.Under NaHCO;stress,the salt-tolerance concentration,median inhibitory concentration and limiting concentration of C.tinctorius seeds were 10.573‰,14.515‰ and 18.457‰,respectively.Under the stress of NaCl and NaHCO;（1∶1） mixed solution,the salt-tolerance concentration,median inhibitory concentration and limiting concentration of C.tinctorius seeds were 10.239‰,14.858‰ and 19.477‰,respectively.[Conclusions] C.tinctorius had relatively strong ability of saline-alkali tolerance.