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Copyright of Acta Agronomica Sinica is the property of Crop Science Society of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The experiment was to study the effect of salt stress on physiological characteristics and the salt tolerance mechanism of sorghum-sudangrass hybrids with different salt tolerance. The experiment was set up under mild (100 mmol/L), moderate (200 mmol/L) and severe (300 mmol/L) NaCl stress to determine the membrane peroxidation, antioxidant enzyme system and osmotic regulatory substances in the leaves of sorghum-sudangrass hybrids under different degrees of salt stress. The results showed that under salt stress, the membrane peroxidation degree of salt tolerant cultivars was lower than that of salt sensitive cultivars. Salt-tolerant varieties ZJZ 8 and ZJZ 10 showed lower increase of malondialdehyde (MDA) content as compared to salt-sensitive ZJZ 21 and ZJZ 4 with increasing salt concentration. Salt-tolerant varieties had stronger expression of cellular defense responses against the action of reactive oxygen species by defense enzyme system, and they had more osmoregulation substances proline (Pro) and soluble sugar (SS) to alleviate the damage than salt-sensitive varieties. Varieties with high activity of superoxide dismutase (SOD) and peroxidase (POD) had more Pro and stronger salt tolerance. The experiment indicates that there are differences in physiological response to salt stress between salt-tolerant varieties and salt-sensitive varieties. The activities of SOD, POD and Pro content can be used to judge the salt-tolerant of sorghum-sudangrass hybrids. [ABSTRACT FROM AUTHOR]