Abstract:

In order to use saline land reasonably to develop the industrialized planting of biomass energy crop sweet sorghum, and provide theoretical support for breeding sweet sorghum with high salt-tolerance, in this study, three varieties, ‘Sixlink Meady’, ‘Chuntian1’, ‘Liaotian1’, of sweet sorghum were used as materials to study their tolerance to natural soil salt stress, the natural soil salt content of which were respective 0.43 g/kg, 2.88 g/kg, 4.06 g/kg and 6.10 g/kg. The results showed that sweet sorghum seed germination was not inhibited when the soil salt content was 0.43 g/kg, 2.88 g/kg. The seed germination was inhibited with the increasing concentration of soil salt. When the soil salt content was 4.06 g/kg and 6.10 g/kg, germination rate of seed of sweet sorghum was below 60%. The three varieties salt-tolerance ability was different by analyzing relative germination rate and plant height in germination stage. Conclusion: The salt tolerance of sweet sorghum seeds were between 0 g/kg and 2.88 g/kg. When the soil salt content was above 4.06 g/kg, the germination of sweet sorghum seeds was inhibited, and the salt tolerance of ‘Sixlink Meady’ was stronger than ‘Chuntian1’ and ‘Liaotian1’.