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Research ArticleEnvironmental and Stress Physiology
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Regulation of Phosphoenolpyruvate Carboxylase and Crassulacean Acid Metabolism Induction in Mesembryanthemum crystallinum L. by Cytokinin

Modulation of Leaf Gene Expression by Roots?

Jürgen M. Schmitt, Mechtild Piepenbrock
Jürgen M. Schmitt
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Mechtild Piepenbrock
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Published August 1992. DOI: https://doi.org/10.1104/pp.99.4.1664

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Abstract

Phosphoenolpyruvate carboxylase (PEPCase), the key enzyme of Crassulacean acid metabolism, is induced by water stress in leaves of Mesembryanthemum crystallinum. In water-stressed plants or excised leaves, exogenous cytokinin suppresses PEPCase transcript accumulation in the leaves. Cytokinin (6-benzylaminopurine) used in concentrations from 5 to 500 micromolar (a) inhibits the upregulation of PEPCase transcripts, enzyme activity, and Crassulacean acid metabolism induction in salt-stressed intact plants when sprayed once daily during the stress period, (b) inhibits the accumulation of PEPCase mRNA in leaves from well-watered plants, (c) down-regulates PEPCase transcripts within 8 hours in prestressed, intact plants after a single spraying of an individual leaf, (d) inhibits accumulation of PEPCase transcripts in excised, wilting leaves, and (e) accelerates the net decrease of PEPCase transcripts in excised leaves from prestressed plants under rehydration conditions. When roots, the main site of cytokinin biosynthesis, are excised, PEPCase induction under drought stress is intensified. We propose that roots, acting as sensors of soil water status, may regulate PEPCase gene expression in the leaves with cytokinin as a signal transducer.

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Regulation of Phosphoenolpyruvate Carboxylase and Crassulacean Acid Metabolism Induction in Mesembryanthemum crystallinum L. by Cytokinin
Jürgen M. Schmitt, Mechtild Piepenbrock
Plant Physiology Aug 1992, 99 (4) 1664-1669; DOI: 10.1104/pp.99.4.1664

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Regulation of Phosphoenolpyruvate Carboxylase and Crassulacean Acid Metabolism Induction in Mesembryanthemum crystallinum L. by Cytokinin
Jürgen M. Schmitt, Mechtild Piepenbrock
Plant Physiology Aug 1992, 99 (4) 1664-1669; DOI: 10.1104/pp.99.4.1664
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Plant Physiology
Vol. 99, Issue 4
August 1992
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