Effect of phosphorus deficiency and water deficit on phosphatase activities from wheat triticum aestivum cultivar gamenya leaves

Barrett Lennard, E.G.; Robson, A.D.; Greenway, H.

Journal of Experimental Botany 35(135): 682-693


ISSN/ISBN: 0022-0957
Accession: 005261254

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Wheat was sown in a P-deficient soil. Plants at low levels of applied P had lower growth rates and lower concentrations of Pi in the shoots than plants grown with high P. Activities of insoluble and soluble phosphatase increased with P deficiency in the mature leaves. Soluble phosphatase activities increased 2.5- to 3.0-fold as the concentration of Pi in the leaves fell from 0.4% to 0.1% dry weight. This increase was not a consequence of reduced growth, as severe N deficiency had no effect on phosphatase activity. Soluble phosphatase activities were higher in young than in mature leaves and increased 3- to 4-fold with severe water deficit. These increases in activity were not accompanied by low concentrations of Pi. Soluble phosphatase activities in mature leaves of plants grown under conditions of water deficit rapidly decreased after rewatering. The high soluble phosphatase activities in mature leaves of P deficient wheat persisted for up to 12 days after the resupply of P to adequate levels.