Bacterial physiological diversity in the rhizosphere of range plants in response to retorted shale stress. [Agropyron smithii Rydb; Atriplex canescens (Pursh) Nutt]
Bacterial populations were isolated from the soil-root interface and root-free regions of Agropyron smithii Rydb. and Atriplex canescens (Pursh) Nutt. grown in soil, retorted shale, or soil over shale. Bacteria isolated from retorted shale exhibited a wider range of tolerance to alkalinity and salinity and decreased growth on amino acid substrates compared with bacteria from soil and soil-over-shale environments. Exoenzyme production was only slightly affected by growth medium treatment. Viable bacterial populations were higher in the rhizosphere and rhizoplane of plants grown in retorted shale than in plants grown in soil or soil over shale. In addition, a greater number of physiological groups of rhizosphere bacteria was observed in retorted shale, compared with soil alone. Two patterns of community similarity were observed in comparisons of bacteria from soil over shale with those from soil and retorted-shale environments. Root-associated populations from soil over shale had a higher proportion of physiological groups in common with those from the soil control than those from the retorted-shale treatment. However, in non-rhizosphere populations, bacterial groups from soil over shale more closely resembled the physiological groups from retorted shale.
- Research Organization:
- Colorado State Univ., Fort Collins
- OSTI ID:
- 5071270
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 52:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
04 OIL SHALES AND TAR SANDS
BACTERIA
PHYSIOLOGY
SPECIES DIVERSITY
SPENT SHALES
ENVIRONMENTAL EFFECTS
BIOLOGICAL ADAPTATION
ECOLOGY
GROWTH
PH VALUE
PLANTS
RANGELANDS
ROOTS
SALINITY
SOILS
TOLERANCE
ECOSYSTEMS
MICROORGANISMS
TERRESTRIAL ECOSYSTEMS
560302* - Chemicals Metabolism & Toxicology- Microorganisms- (-1987)
041000 - Oil Shales & Tar Sands- Environmental Aspects