Pleiotropic effects of adaptation to a single carbon source for growth on alternative substrates

Article Abstract:

The capacity of growing bacteria populations to adapt from one carbon source for growth on alternative substrates has been investigated. The bacteria strains used in the study are two natural isolates of beta-proteobacteria that can degrade the herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D). Twenty lineages of bacteria were allowed to evolve with succinate as the sole carbon source and 2,4-D as the limiting substrate during experimental evolution. Results reveal that only three derived lines had a clear drop in fitness on the alternate substrate after adaptation to their selective substrate. Five derived lines showed improved fitness on both substrates.

Analysis, Physiological aspects, Environmental aspects, Bacterial growth, Bacteria, Adaptation (Physiology), Physiological adaptation, Carbon

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Diversity of arbuscular mycorrhizal fungus populations in heavy-metal-contaminated soils

Article Abstract:

Research was conducted to examine the diversity of arbuscular mycorrhyizal (AM) fungi and how it is influenced by the addition of sewage-amended sludge containing heavy metals. Various host plants with different life cycles were used to multiply indigenous fungi due to the reduced number of indigenous fungal (AMF) propagules in the experimental soils. Results indicate that size and diversity of AMF populations were modified in metal-polluted soils.

Soil microbiology, Biological diversity, Biodiversity, Microbial contamination, Mycorrhizas, Mycorrhizae

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