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Antioxidant-enzymatic system of two sorghum genotypes differing in salt tolerance
| Content Provider | Scilit |
|---|---|
| Author | Costa, Paulo Henrique Alves da de Azevedo Neto, André Dias Bezerra, Marlos Alves Prisco, José Tarquinio Gomes-Filho, Enéas |
| Copyright Year | 2005 |
| Description | Two forage sorghum genotypes were studied: CSF18 (salt-sensitive) and CSF20 (salt-tolerant). Shoot growth reduction as a result of salt stress was stronger in the salt sensitive genotype compared to the salt tolerant one. When the two genotypes were subjected to salt stress (75 mM NaCl) no significant change in lipid peroxidation was observed. However, salt stress induced increases in superoxide dismutase and catalase activities in both genotypes. These salt-induced increases were higher in the salt-tolerant genotype. Peroxidase activity was differentially affected by salt stress in the two genotypes. The activities of these peroxidases were decreased by salt stress in the salt-sensitive genotype and increased in the salt-tolerant genotype. In addition, the activity ratio between the superoxide dismutase and the H2O2-scavenging enzymes was higher in the salt-sensitive genotype. The results obtained support the hypothesis that the higher efficiency of the antioxidant-enzymatic system of the CSF20 genotype could be considered as one of the factors responsible for its tolerance to salt stress. Therefore, it is suggested that the ratio between superoxide dismutase and H2O2-scavenging enzyme activities could be used as a working hypothesis for a biochemical marker for salt tolerance in sorghum. |
| Related Links | http://www.scielo.br/scielo.php?script=sci_pdf&pid=S1677-04202005000400003&lng=en&nrm=iso&tlng=en |
| Ending Page | 362 |
| Page Count | 10 |
| Starting Page | 353 |
| ISSN | 16770420 |
| e-ISSN | 16779452 |
| DOI | 10.1590/s1677-04202005000400003 |
| Journal | Brazilian Journal of Plant Physiology |
| Issue Number | 4 |
| Volume Number | 17 |
| Language | English |
| Publisher | FapUNIFESP (SciELO) |
| Publisher Date | 2005-12-01 |
| Access Restriction | Open |
| Subject Keyword | Brazilian Journal of Plant Physiology Antioxidant Enzymatic Sorghum Genotypes Two Sorghum Salt Tolerance Enzymatic System |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Agronomy and Crop Science |
