In this study, the effects of long-term NaCl treatment were investigated in
two cultivars of peanut designated as drought-resistant and
drought-sensitive. Growth parameters, changes in the concentrations of MDA,
H2O2 and proline, and the activities of antioxidant enzymes were determined
under salinity stress. Growth parameters indicated the superiority of cv.
Florispan to cv. Gazipa?a under milder salinity stress treatment. However,
comparative analysis of the two cultivars showed that MDA, H2O2, ion leakage
levels and photosystem II activities were not significantly different, except
for the proline activity, which increased only in Florispan leaf tissues
under 100 mM salt treatment. Among the processes that govern the tolerance in
peanut tissues, proline level and the activity of glutathione reductase (GR)
appeared to be only components that play an important part in salt stress
protection.
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