Biologic Markers of Air-Pollution Stress and Damage in Forests (1989) / Chapter Skim
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Microbial and Rhizosphere Markers of Air Pollution Induced Stress
Microbial and Rhizosphere Markers of Air Pollution Induced Stress
Pages 233-244
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Air pollution induced changes in species composition of tree ectomycorrhizae could potentially affect soil nutrient cycles and tree growth. INTRODUCTION The rhizosphere is considered to be that zone of the soil environment influenced by plant roots.
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Rhizosphere bacterial isolates demonstrate growth and amino acid utilization patterns suggesting adaptation to root products. Air pollutants affecting tree carbon fixation or allocation patterns have potential to influence rhizosphere organisms; however, our knowledge of these effects in forest species is limited.
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Nye and Tinker (1977) listed the mechanisms by which rhizosphere organisms might influence plant nutrient availability, including alterations in root morphological and physiological properties, effects on phase equilibria of soil nutrients, effects of soil chemical composition and organic matter mineralization, direct transfer of nutrients, and competition for soil nutrients.
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AIR POLLUTION EFFECTS Air pollutants might affect rhizosphere activity by plant mediated effects or through direct effects on the soil environment. Using pine seedlings Luxmoore et al.
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Data on fruitbody occurrence suggest that ECM populations in Europe have changed; a concomitant shift in mycorrhizal root tips would likely influence enzyme production and rhizosphere composition. Shifts in the relative abundance of these morpho-types, whether due to air pollution effects on trees or soils, could affect phosphorus cycling and other soil processes.
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Most of what is known about rhizosphere effects comes from studies of crop plants in agricultural soils. - Air pollutants might influence rhizosphere structure or function by effects on plant carbon fixation or allocation, or by direct effects on the soil environment.
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III. The surface phosphatase activities of resynthesized mycorrhizal complexes.
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1988. The root surface phosphatases of Eriophorum vaginatum: Effects of temperature, pH, substrate concentration and inorganic phosphorus.
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1969. Differences in the properties of the acid phosphatases of plant roots and their significance in the evolution of edaphic ecotypes.
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1988. The root surface phosphatases of Eriophorum vaginatum: Effects of temperature, pH, substrate concentration and inorganic phosphorus.
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The Workshop Papers Biochemical/Cell-Tissue Session
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