Abstract
The effect of drought stress on changes in acid phosphatase (APase) activities inrelationship with phosphorus was studied in wheat embryos and endosperm. Drought stresswas imposed by withholding water irrigation to the 12 h germinated seeds. The tissues(embryos and endosperm) were separated and APase activity was estimated. After droughtstress, a significant increase in embryo and endosperm APase activity was observed. NativePAGEAPase activity also revealed a similar type of induction under stress conditions.Imposition of drought stress caused no significant change in phosphorous level inendosperm; however, a significant decrease in the embryos phosphorus level was observedafter 6 h of stress, indicating tissue specific key role of APase activity under drought stress inmaintaining Pi level.
Highlights
Acid phosphatases (APases) form a group of enzymes catalyzing hydrolysis of a variety of phosphate esters in acidic environments
APases in plants are a classes of enzymes that display considerable heterogeneity with regard to their kinetics and functions (Duff et al 1994). This complexity may contribute to conflicting reports regarding the role of APA in phosphorous nutrition
Our studies revealed a substantial enhancement in acid phosphatase activities in a temporal manner under drought stress
Summary
Acid phosphatases (APases) form a group of enzymes catalyzing hydrolysis of a variety of phosphate esters in acidic environments. Salt and osmotic stresses have been reported to increase APase activity (Barret-Lennard et al, 1982; Szabo-Nagy et al, 1992). This study was designed to examine the role of APase under drought stress in relationship with Pi in wheat.
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