A relationship between the antioxidant defence
system and salt tolerance in two clones of potato
(Solanum tuberosum L.) differing in salt sensitivity was
studied. The antioxidant defence system of the sensitive clone responded
differently to 100 and 150 mM NaCl. At 100 mM NaCl, growth, dehydroascorbate
reductase and catalase activities remained unaltered, but chlorophyll and
reduced glutathione content decreased (23% and 35%,
respectively), while ascorbate content and superoxide dismutase activity were
increased 34% and 63%, with respect to the control (0 mM NaCl).
The superoxide dismutase increment was higher under 150 mM NaCl treatment,
while a general decrease (except for dehydroascorbate reductase and catalase
activities) in all the antioxidant parameters studied was observed in the
sensitive clone. Reduced glutathione and ascorbate, the main antioxidant
soluble defences, and all antioxidant enzymes (except catalase) were
significantly elevated in the tolerant clone compared to the sensitive one
when both were grown in the absence of NaCl. Under 100 and 150 mM NaCl
treatments, no changes in the antioxidant stress parameters were detected in
the tolerant clone. These results suggest a relationship between salt
tolerance and the antioxidant defence system in the two clones.
Downregulation of FeSOD-A expression in Leishmania infantum alters trivalent antimony and miltefosine susceptibility
