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Plant Biol (Stuttg) 2007; 9(3): 420-426
DOI: 10.1055/s-2006-924761
Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Involvement of the Phosphoinositide Signaling Pathway in the Anti-Senescence Effect of Low-Concentration Stressors on Detached Barley Leaves

P. Nyitrai1 , M. Mayer2 , M. Óvári3 , Á. Keresztes2
  • 1Department of Plant Physiology and Molecular Plant Biology, Eötvös University, Pázmány P. stny. 1/C., 1117 Budapest, Hungary
  • 2Department of Plant Anatomy, Eötvös University, Pázmány P. stny. 1/C., 1117 Budapest, Hungary
  • 3Department of Chemical Technology and Environmental Chemistry, Eötvös University, Pázmány P. stny. 1/A., 1117 Budapest, Hungary
Further Information

Publication History

Received: July 14, 2006

Accepted: October 23, 2006

Publication Date:
19 January 2007 (online)

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Abstract

The effect of low concentration of some stress-inducing compounds of different toxicity and chemical nature like Pb and Ti salts or DCMU on the senescence of chloroplasts was investigated in detached primary leaves of barley (Hordeum vulgare cv. Omega). These agents stimulated chlorophyll accumulation, photosynthetic activity (14CO2 fixation), and decreased the number of plastoglobuli in chloroplasts compared to the control, thus delaying senescence. Low-concentration stressors did not increase the level of active cytokinins of leaves during the treatment. Lithium and stearoylcarnitine chloride inhibited the stimulating effect of stressors. This points to the involvement of the PIP2-IP3/DAG signal transduction pathway in generation of the specific responses.

Key words

DCMU - Pb - Ti - senescence - PIP2-IP3/DAG pathway - Hordeum vulgare.

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P. Nyitrai

Department of Plant Physiology and Molecular Plant Biology
Eötvös University

Pázmány Péter stny. 1/C.

1117 Budapest

Hungary

Email: pnyiti@ludens.elte.hu

Editor: J. T. M. Elzenga