Effects of Salt Stress on Seed Germination and Seedling Growth of 6 Forage Sorghum dochna Varieties
Six forage Sorghum dochna varieties were used as materials for seed germination tests under 5 gradient ratios of NaCl and Na2SO4 solution(0(ck),50,100,150,200 mmol/L).Germination rate,germination potential,bud length,root length,salt damage rate,plant height,stem diameter,dry/fresh ratio and soluble sugar content were determined.To explore the effects of different salt stress on seed germination characteristics and seedling growth.The results showed that with the in-crease of NaCl and Na2SO4 concentrations,the germination rate,germination potential,bud length,root length,plant height,stem diameter and dry-fresh ratio of forage sweet sorghum seeds gradually decreased,and the salt damage rate and soluble sugar content gradually increased.When NaCl concen-tration was greater than 100 mmol/L and Na2SO4 was greater than 50 mmol/L,the germination rate,germination potential,plant height,stem diameter and dry-fresh ratio of seeds significantly decreased(p＜0.05).When the concentration of NaCl was 200 mmol/L,Dakar,Manatee and Zhongketian2 stopped growing,while when the concentration of Na2SO4 was greater than 150 mmol/L,Dakar,Manatee,Zhongketian438 and Zhongketian2 stopped growing,indicating that the harmful effect of Na2SO4 stress was more prominent.According to the comprehensive evaluation by membership func-tion method,the salt tolerance of the six varieties at germination and seedling stage was as follows:Dakar＞3701＞Zhongketian438＞Zhongketian2＞Manatee＞Dahlix and 3701＞Dahlix＞Dakar＞Mana-tee＞Zhongketian438＞Zhongketian2.In conclusion,the forage Sorghum dochna 3701 had strong salt tolerance and was suitable for planting in saline-alkali areas.
forage Sorghum dochnaNaCl stressNa2SO4 stressseed germinationseedling salt tolerance
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