Salt Tolerance of Helianthus Varieties at Germination Stage

With different NaCl concentration(which were 0.05,0.1,0.15,0.2,0.25,0.3,0.35 mol/L),the germination percentage,the relative germination percentage,seed potentiality,germination index,the relative root length were calculated.The salt-tolerance characteristic and membership function for a comprehensive evaluation were researched with salt concentration,semi-lethal salt concentration,the limit salt concentration.Under the condition of salt stress,the overall trend was that the germination percentage,seed potentiality,germination index and root growth of different Helianthus seeds had declined with increasing salt content.The reaction of different varieties was different under salt stress.The results showed that salt-tolerance character of Helianthus was stronger.The salt-tolerance order of eight varieties of Helianthus was:567DW 658RuiTeMuXinZaKui4HaoEurope HelianthusF53HelianthusF57 Helianthus TiaoShan.The research on germination with salt tolerance of eight Helianthus varieties could provide a theoretic basis to breed excellent salt-resistant varieties.