Abstract: Taking two sorghum hybridized combinations Tx623A×89-363 and Hei30A×Dalizao as test materials, 100 mmol·L^-1 NaCl solution was used to prime their seeds, and 0, 50, 100, and 150 mmol·L^-1NaCl solutions were designed for simulating salt stress. The effects of seed priming on the biomass allocation and the soluble substances, Na⁺ and K⁺ contents in different organs of the sorghum seedlings under salt stress were examined. Seed priming promoted the seedling’s growth, and increased the total amount of seedling’s dry matter, root biomass ratio, and root-shoot ratio in various degrees. Under the salt stress of 150 mmol NaCl·L^-1, the root biomass ratio, root-shoot ratio, and total amount of dry matter of primed Tx623A×89-363 were 5.4%, 6.2%, and 7.5% higher than those of the control, respectively, and the total amount of the dry matter of primed Hei30A×Dalizao was 10.9% higher than that of the control. Seed priming also increased the soluble sugar and proline contents of seedling’s leaves and roots significantly. Under the salt stress of 150 mmol NaCl ·L^-1, the soluble sugar and proline contents in primed Tx623A×89-363 seedling’s leaves and roots were 94% and 100%, and 85% and 202% higher than those of the control, and the contents of these two compounds in primed Hei30A×Dalizao were 48% and 71%, and 193%, 264% higher than those of the control, respectively. The Na⁺/K⁺ ratio in the seedling’s stems and leaves and seedling’s roots of Tx623A×89-363 and Hei30A×Dalizao was significantly reduced by priming. Under the salt stress of 150 mmol NaCl·L^-1, the Na⁺/K⁺ ratio in the seedling’s stems and leaves and seedling’s roots of Tx623A×89-363 was reduced by 16.7% and 20.6%, and that of Hei30A×Dalizao was reduced by 5.5% and 13.2%, respectively. The results proved that seed priming enhanced the adaptability of sorghum seedlings to salt stress to a certain extent. The effectiveness of seed priming differed with hybridized combinations, being better for the hybridized combination with weaker salt tolerance.

Key words: Arbuscular mycorrhizal fungi, Potassium-applied amount, Potassium accumulation and distribution, Potassium content in tobacco leaf, Flue-cured Tobacco