The objective of this work was to evaluate the organic compound content in forage sorghum under salt stress condition. The experiment was carried out in a greenhouse with a factorial scheme of 3x10, in a completely randomized design and four replicates. The evaluated treatments were three levels of soil salinity (2.4, 10 e 16 dS m-1) and ten genotypes of forage sorghum (IPA SF-25, IPA 02-03-01, IPA 42-70-02, CSF-4, CSF-5, CSF-6, CSF-7, CSF-8, CSF-9 e CSF-10). There was an increase of 20.2 and 21.3% in soluble carbohydrates, respectively, for salt treatments of 10 and 16 dS m-1. The content of soluble proteins varied among sorghum cultivars, as a response to salt treatment. The highest values of total free amino acids occurred in plants grown under the salinity level of 16 dS m-1. Saline treatments increased sorghum content of proline for the genotypes CSF-5, CSF-6 and CSF-9 (at 10 dS m-1), and for CSF-10 and CSF-4 (at 16 dS m-1). The increase in soluble carbohydrates, soluble proteins, total free amino acids and free proline content is proportional to soil salinity and varies with the studied genotypes.
Sorghum bicolor; soluble carbohydrates; soluble proteins; salinity
