Iron uptake in dicots depends on their ability to induce a set of responses in root cells including rhizosphere acidification through H(+) extrusion and apoplastic Fe(III) reduction by Fe(III)-chelate reductase. These responses must be sustained by metabolic rearrangements aimed at providing the required NAD(P)H, ATP and H(+). Previous results in Fe-deficient cucumber roots showed that high H(+...

Abstract Aims High viscosity, low surface tension and hydrophobicity are specific properties of maize root mucilage which contribute to modulate the spatial configuration liquid phase in soil pores. Several processes rhizosphere, particularly nutrient absorption, exudation microbial activity, may cause strong temporal variations chemistry solution rhizosphere. Although physical have been repeat...

Tropical seagrasses are nutrient-limited owing to the strong phosphorus fixation capacity of carbonate-rich sediments, yet they form densely vegetated, multispecies meadows in oligotrophic tropical waters. Using a novel combination of high-resolution, two-dimensional chemical imaging of O2, pH, iron, sulfide, calcium, and phosphorus, we found that tropical seagrasses are able to mobilize the es...

Rhizosphere soil can play a central role in the maintenance of the soil–plant system and influencing the biogeochemistry of forest ecosystems. However, rhizospheric studies in situ to understand the ecosystem functions are still lacking. Therefore, the objectives of the present study were to examine the differences in the chemical properties such as the pH, organic C, exchangeable base cations ...

Pot experiments were conducted to investigate the changes of the dissolved organic matter (DOM) in the rhizosphere of hyperaccumulating ecotype (HE) and non-hyperaccumulating ecotype (NHE) of Sedum alfredii and its effects on Zn and Cd sorption by soils. After planted with HE, soil pH in the rhizosphere reduced by 0.5-0.6 units which is consistent with the increase of DOM. The hydrophilic fract...

A long term study has been carried out for over a decade across various tea gardens, located in different parts of Indian Himalayan Region (IHR), with a focus on rhizosphere microbiology of tea. Occurrence of ‘negative rhizosphere effect’ exerted by the established tea bushes, in contrast to the normal stimulatory effect exhibited by the plants in general as well as young tea bushes, is the fir...

All the microorganisms produce primary and secondary metabolites which have various industrial applications. Metabolites such as antibiotics are mainly produced by the filamentous microorganisms such as bacteria and fungi. The rhizosphere is a narrow zone surrounding and influenced by plant roots and also a hot spot for several organisms. Organisms found in vicinity of roots include bacteria, f...

Understanding the stability of chloropyromorphite (CPY) is of considerable benefit for improving risk assessment and remediation strategies in contaminated water and soil. The stability of CPY in the rhizosphere of phosphorus-deficient ryegrass was evaluated to elucidate the role of root-secreted low molecular weight organic acids (LMWOAs) on the dissolution of CPY. Results showed that CPY trea...