Differential responses of antioxidative defense system to NaCl in grain and forage sorghum during germination and seedling establishment
Year: 2018
Type: article
Abstract: Tolerance of crops to abiotic stresses can vary among cultivars and due to the phenotypic stage of development.The aim of this study was to evaluate the salinity effects on germination, seedling establishment and physiological changes on grain (BRS 310) and forage sorghum (BRS 800).Sorghum seeds were sown between two paper towels moistened with deionized water and also NaCl solution (50 mM) for 10 days.We evaluated the germination percentage, growth parameters, contents of inorganic and organic solutes and activity of antioxidant enzymes.The salinity did not affect sorghum seeds germination, however, it caused a reduction in the development of the seedlings.Both genotypes presented similar growth parameters under optimum and salt stress conditions, with exception for decreases in shoot length and shoot dry mass of BRS 800 genotype under salinity.Similar results for inorganic solutes accumulation in both genotypes suggest that osmotic adjustment cannot be considered as one of the strategies used by these genotypes to attenuate the NaCl effects.BRS 310 genotype is more tolerant to salinity than BRS 800 genotype and it is likely to be related to a better protection mechanism against oxidative damage by inducing activities of antioxidant enzymes, such as ascorbate peroxidase and catalase.This study highlights the importance of these enzymes in the establishment of salttolerant sorghum seedlings under salinity conditions.
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2890728124