Effects of different salt stress treatments on physiological characteristics of sorghum-sudangrass seedlings
The experiment aimed to investigate the effects of salt stress treatment with different concentrations on the growth and physiological characteristics of seedlings of Sorghum-sudangrass.11 sorghum-sudangrass varieties(lines)were selected as test materials,which were new strains G-03,G-18,G-37,G-82,G-94,G-120,G-135,G-141,and SX19,Super Sugar King,and Dajiang.The test materials were subjected to stress treatment with NaCl solutions of different concentrations(0,100,200,300 mmol/L).The results showed that plant height,fresh weight per plant,dry weight per plant and chlorophyll(CHL)relative content decreased with the increase of salt stress concentration.The plant height of G-135 under different salt stress treatments was higher than that of other varieties(lines),and the fresh weight per plant of G-135 under 0,100,and 200 mmol/L was higher than that of other varieties(lines).The fresh weight per plant of SX19 was higher than that of other varieties(lines)under 300 mmol/L salt stress.Under different salt stress treatments,the dry weight per plant of SX19 was significantly higher than that of other varieties(lines)(P<0.05).The activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT)of all varieties(lines)showed a trend of increasing first and then decreasing.The Proline(Pro)content,malondialdehyde(MDA)content and cytoplasmic membrane permeability(CMP)increased continuously.The study indicates that SX19 showed strong salt tolerance compared with other varieties(lines)in the seedling growth period,and G-135 in the eight new lines of sorghum-sudangrass showed strong salt tolerance,which may be suitable for planting in saline-alkali soil.
salt stresssorghum-sudangrassseedlingsgrowth indexphysiological characteristics
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