Root exudates as mediators of mineral acquisition in low-nutrient environments

  title={Root exudates as mediators of mineral acquisition in low-nutrient environments},
  author={Felix D. Dakora and Donald A. Phillips},
  journal={Plant and Soil},
Plant developmental processes are controlled by internal signals that depend on the adequate supply of mineral nutrients by soil to roots. Thus, the availability of nutrient elements can be a major constraint to plant growth in many environments of the world, especially the tropics where soils are extremely low in nutrients. Plants take up most mineral nutrients through the rhizosphere where micro-organisms interact with plant products in root exudates. Plant root exudates consist of a complex… 
Root Exudation of Primary Metabolites: Mechanisms and Their Roles in Plant Responses to Environmental Stimuli
This review synthetize recent advances in ecology and plant biology to explain and propose mechanisms by which root exudation of primary metabolites is controlled, and what role theirExudation plays in plant nutrient acquisition strategies, and proposes a novel conceptual framework forRoot exudates.
Rhizospheric organic compounds in the soil–microorganism–plant system: their role in iron availability
Poor iron (Fe) availability in soil represents one of the most important limiting factors of agricultural production and is closely linked to physical, chemical and biological processes within the
Role of root exudates in metal acquisition and tolerance.
Plant-driven selection of microbes
The general part of the manuscript is followed by the more detailed presentation of specific examples for the selection and interaction of roots and microbes, such as in the rhizosphere of strawberry, potato and oilseed rape, where the soil-borne plant pathogen Verticillium dahliae can cause high yield losses; the potential of biocontrol by specific constituents of the Rhizosphere microbial community is demonstrated.
Plant Root Secretions and Their Interactions with Neighbors
The combination of techniques and the continuous development of new techniques in the field of rhizosphere biology coupled with systems approach will allow to elucidate these complex interactions under field conditions to improve the plant growth at species and community level.
Root exudates: from plant to rhizosphere and beyond
Since root exudates play an important role in the recruitment of mycorrhizal fungi and plant growth-promoting rhizobacteria (PGPR), the mechanisms of interaction between plants and the beneficial microbiota have been highlighted.
Plant-microorganism-soil interactions influence the Fe availability in the rhizosphere of cucumber plants.
Biochemical and Molecular Mechanisms of Plant-Microbe-Metal Interactions: Relevance for Phytoremediation
This review presents the recent advances and applications made hitherto in understanding the biochemical and molecular mechanisms of plant–microbe interactions and their role in the major processes involved in phytoremediation, such as heavy metal detoxification, mobilization, immobilization, transformation, transport, and distribution.
Rhizosphere Effect on Nutrient Availability in Soil and Its Uptake by Plants: A Review
  • M. Dotaniya, V. Meena
  • Environmental Science
    Proceedings of the National Academy of Sciences, India Section B: Biological Sciences
  • 2013
Rhizosphere is a vital region of plant ecosystem; ~2 mm from the root surface is termed as rhizosphere zone. It governs the chemistry of plant nutrient and affects growth of the plants. Nutrient


Organic acids in the rhizosphere – a critical review
Organic acids, such as malate, citrate and oxalate, have been proposed to be involved in many processes operating in the rhizosphere, including nutrient acquisition and metal detoxification,
Physiological adaptations to phosphorus deficiency during proteoid root development in white lupin
It is demonstrated that increased accumulation and exudation of citric acid and a concomitant release of protons were predominantly restricted to mature root clusters in the later stages of P deficiency, suggesting the induction of a high-affinity Pi-uptake system.
The rhizosphere and plant nutrition: a quantitative approach
  • P. Darrah
  • Environmental Science
    Plant and Soil
  • 2004
The role of the rhizosphere in relation to mineral nutrition is discussed within a quantitative framework using the Barber-Cushman model as a starting point. The uptake or release of nutrients by
Plant root excretions in relation to the rhizosphere effect
SummaryThe inclusion of exudates from the roots of peas and oats in liquid media has been found to increase the growth of micro-organisms isolated from both control soil and the rhizosphere of
H+ extrusion and organic-acid synthesis in N2 -fixing symbioses involving vascular plants.
An analysis of published data suggests that the N2 -fixing symbiotic vascular plants extrude more H+ per unit N fixed than would be expected from data on the same genotypes growing on NH4 + if the
Influence of microorganisms on iron acquisition in maize
Biosynthesis and root exudation of citric and malic acids in phosphate-starved rape plants
Rape (Brassica napus L.) plants are efficient users of rock phosphates, and the biosynthesis and excretion of organic acids were investigated, partly by comparing physiological reactions to P deficiency of rape with those of an inefficient user of rock phosphate from the same family, hedge mustard.
Root excretion of carboxylic acids and protons in phosphorus-deficient plants
The results suggest that P deficiency-induced exudation of carboxylic acids depends on the ability to accumulate carboxYlic acids in the root tissue, which in turn is determined by biosynthesis, degradation and partitioning of car boxylic acid or related precursors between roots and shoot.
Mobilization of phosphate in different soils by ryegrass supplied with ammonium or nitrate
Mobilization of soil P as the result of plant-induced changes of soil pH in the vicinity of plant roots was studied. Seedlings of ryegrass were grown in small containers separating roots from soil by
Acid phosphatase activity in phosphorus‐deficient white lupin roots
The fact that exudation of proteoid-root-specific acid phosphatase coincides with proteoid root development and increased exUDation of organic acids indicates that white lupin has several coordinated adaptive strategies to P-deficient conditions.