Abstract
The plasma membrane associated H+-ATPase (P-type) and vacuolar membrane associated H+-ATPase (V-type) enzymes are known to be the site of functional alterations during fluoride (F) stress. The present study was conducted on three species of semi-arid region, viz., Acacia tortilis, Cassia fistula and Prosopis juliflora that are found to be hyperaccumulator for F. The enzyme activities were assayed in microsomal fractions (10,000 g supernatant fractions). A decrease in P-ATPase and V-ATPase activity was associated with F stress of varying degrees in all the species tested. Both enzymes showed highest activities in P. juliflora and lowest in C. fistula. In general P-ATPase activity of leaves was more inhibited by increase in F concentrations ranging from 10–50 mg kg−1 in the medium as compared with V-ATPase. The aim was to examine the relationship between F stress and adaptive responses as improved tolerance in the plants by investigating changes in the V-ATPase and P-ATPase activities of A. tortilis, C. fistula and P. juliflora.
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