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Growth Parameters and Resistance against Drechslera teres of Spring Barley ( Hordeum vulgare L. cv. Scarlett) Grown at Elevated Ozone and Carbon Dioxide Concentrations
Author(s) -
Plessl M.,
Heller W.,
Payer H.D.,
Elstner E. F.,
Habermeyer J.,
Heiser I.
Publication year - 2005
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1055/s-2005-873002
Subject(s) - hordeum vulgare , ozone , drechslera , biology , tiller (botany) , seedling , botany , horticulture , starch , carbon dioxide , poaceae , chemistry , food science , ecology , organic chemistry
Spring barley ( Hordeum vulgare L. cv. Scarlett) was grown at two CO 2 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 CO 2 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 CO 2 . The elevated CO 2 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 CO 2 . 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 CO 2 . 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.