Abstract:

Sweet sorghum is a kind of energy crops, with drought-tolerance, water logging tolerance, salt-tolerant features. In this study, three varieties, BJ-17, BJ-18 and M-0011, of sweet sorghum were used as materials to study their tolerance to salt stress. The results showed that under different concentration of NaCl treatment, seed germination is inhibited with the increasing concentration of NaCl. Comparison of the six physiological and biochemical indicators assayed showed the following trends: after treatment, seedlings fresh weight and height were decreased, the relative electrolyte leakage rate of leaves as well as the MDA and proline content increased, leaf chlorophyll content dropped, and chlorophyll b content declined obviously. Among the three sweet sorghum varieties (strains), BJ-18 has the strongest salt tolerance, BJ-17 is in the middle, and M1-00110 is sensitive to salt stress.