2001•Plant and Cell PhysiologyRequires access

Induction of PEP Carboxylase and Crassulacean Acid Metabolism by Gibberellic Acid in Mesembryanthemum crystallinum

Lonnie J. Guralnick, Maurice S. B. Ku, Gerald E. Edwards, Darren Strand, Brandon Hockema, Jeannine Earnest

Abstract

The induction of Crassulacean acid metabolism in M:esembryanthemum crystallinum was investigated in response to foliar application of gibberellic acid (GA). After 5 weeks of treatment, GA-treated plants showed 1.7- to almost a 4-fold increase of phosphoenolpyruvate carboxylase (PEPcase) activity with a concomitant increase in acid metabolism when compared to control plants. Immunoblot analysis indicated an increase in the PEPcase protein similar to that of salt treatment while Rubisco did not show a similar rise. The results indicate that exogenously applied GA accelerates plant developmental expression of PEPcase and Crassulacean acid metabolism in M: crystallinum.

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Key concepts: Mesembryanthemum crystallinum, Crassulacean acid metabolism, Phosphoenolpyruvate carboxylase, Gibberellic acid, Biology, Pyruvate carboxylase, Phosphoenolpyruvate carboxykinase, Botany