Regulation of root-associated methanotrophy by oxygen availability in the rhizosphere of two aquatic macrophytes

Article Abstract:

Freshwater marsh plants Pontederia cordata and Sparganium eurycarpum oxidize methane differently incubated in split chambers. Low rates of methanotrophy were observed when the supply of exogenous oxygen was limited. Under these conditions, the oxygen transport rates of the plants, restricted the rates of methane oxidation. These findings indicate that the availability of oxygen is a determining factor in root-associated methanotrophy of plants.

Physiological aspects, Methane, Freshwater fauna, Freshwater animals

---

Ferric iron reduction by bacteria associated with the roots of freshwater and marine macrophytes

Article Abstract:

Iron reduction on macrophyte roots growing in acidic peat and microbially mediated iron reduction are discussed. The former can occur at significant rates. The latter occurs on marine macrophyte roots in conditions that inhibit bacterial sulfate reduction. Iron reducers may reduce humic acids and do participate in an active iron cycle and limit organic availability to other heterotrophs in the rhizosphere and bulk sediments. .

United States, Statistical Data Included, Research, Roots (Botany), Wetlands, Iron, Iron (Metal), Marine pollution, Peat, Biogeochemical cycles

---

Evidence that elevated CO2 levels can indirectly increase rhizosphere denitrifier activity

Article Abstract:

The activity of the denitrifier enzyme in wheat rhizoplanes is studied in controlled environments to determine the effect of carbon dioxide levels on enzyme activity. Results indicate a direct relationship between the denitrifier enzyme activity and carbon dioxide tension. There is a three to 24 fold increase in the enzyme activity among plants grown in an environment with elevated carbon dioxide partial pressure.

Denitrification, Nitrogen-fixing microorganisms

Similar abstracts:

• Abstracts: Early determination of nasal-temporal retinotopic specificity in the eye anlage of the chick embryo. Interactive cellular modulation of chondrogenic differentiation in vitro by subpopulations of chick embryonic calvarial cells
• Abstracts: Regulation of pectin methylesterase and polygalacturonate lyase activity during differentiation of infection structures in Uromyces viciae-fabae
• Abstracts: Identification of a novel nutrient-deprivation-induced Sinorhizobium meliloti gene (hmgA) involved in the degradation of tyrosine
• Abstracts: Reproductive and mate choice strategies in the hermaphroditic flatworm Echinostoma caproni. High levels of conservation at microsatellite loci among ictalurid catfishes
• Abstracts: TGF beta 1 inhibits the formation of benign skin tumors, but enhances progression to invasive spindle carcinomas in transgenic mice

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.