Journal Article

Induction of PEP Carboxylase and Crassulacean Acid Metabolism by Gibberellic Acid in <i>Mesembryanthemum crystallinum</i>

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 2, pages 236-239
Published in print February 2001 | ISSN: 0032-0781
Published online February 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce020
Induction of PEP Carboxylase and Crassulacean Acid Metabolism by Gibberellic Acid in Mesembryanthemum crystallinum

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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.

Keywords: Key words: Crassulacean acid metabolism — Development — Gibberellic acid — Mesembryanthemum crystallinum — Phosphoenolpyruvate carboxylase.; Abbreviations: GA, gibberellic acid; CAM, Crassulacean acid metabolism; LP, leaf pair; PEPcase, phosphoenolpyruvate carboxylase; Rubisco, ribulose bisphoshate carboxylase.

Journal Article.  2588 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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