Oxidative damage and antioxidant defenses as potential indicators of salt-tolerant Cenchrus ciliaris L. genotypes

摘要: Abstract Oxidative stress was used as a tool for differential characterization of salt-tolerant Cenchrus ciliaris L. genotypes, part genetic improvement program. Four genotypes were subjected to gradual salinity stress. After 17 days 300 mM NaCl treatment, the level damage in morphological traits lower two Americana and Biloela (named genotypes), than Texas Sexual less genotypes). characters evaluated at early time points salt treatment. Thus, 48 h, tolerance correlated with increase total superoxide dismutase (SOD) activity but higher catalase (CAT) tolerant Texas. Salt accompanied by decrease oxidative damage, foliar malondialdehyde (MDA) O 2 − content roots, Americana, compared tolerant, Moreover, more roots associated an enhanced SOD activity. To validate they measured Sexual, other contrasting tolerance. We propose characters, particularly MDA root content, potential indicators tolerance, since allow simple, rapid, cost-effective identification genotypes.