The induction of Crassulacean acid metabolism in Mesembryanthemum 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.
Guralnick, LJ, Maurice SB Ku, Gerald E Edwards, Darren Strand, Brandon Hockema and Jeannine Earnest. 2001. "Induction of PEP carboxylase and Crassulacean acid metabolism with Gibberellic acid in Mesembryanthemum crystallinum." Plant & Cell Physiology 42 (2): 236-239.