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Plant Biol (Stuttg) 2005; 7(6): 694-705
DOI: 10.1055/s-2005-873002
Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Growth Parameters and Resistance against Drechslera teres of Spring Barley (Hordeum vulgare L. cv. Scarlett) Grown at Elevated Ozone and Carbon Dioxide Concentrations

M. Plessl1 , W. Heller2 , H.-D. Payer3 , E. F. Elstner1 , J. Habermeyer1 , I. Heiser1
  • 1Institute of Phytopathology, Life Science Center Weihenstephan, Technical University of Munich, Am Hochanger 2, 85350 Freising, Germany
  • 2GSF - National Research Center for Environment and Health, Institute of Biochemical Plant Pathology, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
  • 3GSF - National Research Center for Environment and Health, Institute of Soil Ecology, Department of Environmental Engineering, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
Further Information

Publication History

Received: July 1, 2005

Accepted: October 25, 2005

Publication Date:
02 January 2006 (online)

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Abstract

Spring barley (Hordeum vulgare L. cv. Scarlett) was grown at two CO2 levels (400 vs. 700 ppm) combined with two ozone regimes (ambient vs. double ambient) in climate chambers for four weeks, beginning at seedling emergence. Elevated CO2 concentration significantly increased aboveground biomass, root biomass, and tiller number, whereas double ambient ozone significantly decreased these parameters. These ozone-induced reductions in growth parameters were strongly overridden by 700 ppm CO2. The elevated CO2 level increased C : N ratio of the leaf tissue and leaf starch content but decreased leaf protein levels. Exposure to double ambient ozone did not affect protein content and C : N ratio but dramatically increased leaf starch levels at 700 ppm CO2. Resistance against Drechslera teres (Sacc.) Shoemaker was increased in leaves grown at double ambient ozone but was less obvious at 700 ppm than at 400 ppm CO2. Constitutive activities of β‐1,3-glucanase and chitinase were significantly higher in leaves grown at double ambient ozone compared to ambient ozone levels. The sum of methanol-soluble and alkali-released cell wall-bound aromatic metabolites (i.e., C-glycosylflavones and several structurally unidentified metabolites) and lignin contents did not show any treatment-dependent differences.

Key words

Net blotch disease (Drechslera teres) - Hordeum vulgare - induced resistance - PR proteins

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I. Heiser

Institute of Phytopathology
Life Science Center Weihenstephan
Technical University of Munich

Am Hochanger 2

85350 Freising

Germany

Email: heiser@lrz.tum.de

Guest Editor: R. Matyssek

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