Journal ArticleDOI
Active ion uptake and maintenance of cation-anion balance: A critical examination of their role in regulating rhizosphere pH
TLDR
In this article, the processes responsible for maintaining cation-anion balance in plants and their relation to active ion accumulation and changes in rhizosphere pH are outlined and discussed.Abstract:
The processes responsible for maintenance of cation-anion balance in plants and their relation to active ion accumulation and changes in rhizosphere pH are outlined and discussed. The major processes involved are: (1) accumulation and degradation of organic acids which occur in the plant mainly as organic acid anions (and their transfer within the plant) and (2) extrusion of H+ or OH− into the rhizosphere. The relative importance of the two processes is determined by the size of the excess anion or cation uptake. Indeed, plants typically absorb unequal quantities of nutritive cations (NH4++Ca2++ Mg2++K++Na+) and anions (NO3−+Cl−+SO42−+H2PO4−) and charge balance is maintained by excretion of an amount of H+ or OH− which is stoichiometrically equal to the respective excess cation or anion uptake. The mechanisms and processes by which H+ and in particular OH− ions are excreted in response to unequal cation-anion uptake are, however, poorly understood.read more
Citations
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Journal ArticleDOI
Bioavailability of soil inorganic P in the rhizosphere as affected by root-induced chemical changes: A review
TL;DR: In this paper, the authors give an overview of those chemical processes that are directly induced by plant roots and which can affect the concentration of P in the soil solution and, ultimately, the bioavailability of soil inorganic P to plants.
Journal ArticleDOI
Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review
TL;DR: The aim of the present review is to define the various origins of root-mediated changes of pH in the rhizosphere, i.e., the volume of soil around roots that is influenced by root activities and the response of plant roots to deficiencies of P and Fe and to Al toxicity.
Book ChapterDOI
Root exudates as mediators of mineral acquisition in low-nutrient environments
TL;DR: The current understanding of how plants use root exudates to modify rhizosphere pH and the potential benefits associated with such processes are assessed are assessed in this review.
Book ChapterDOI
Enhancing nitrogen use efficiency in crop plants
TL;DR: In this article, the authors discuss N dynamics in soil plant systems, and outline management options for enhancing N use by annual crops, including livestock production with cropping, to improve N efficiency in agriculture.
Book ChapterDOI
Growth Promotion of Plants Inoculated with Phosphate-Solubilizing Fungi
TL;DR: Many soil fungi, predominantly of the genera Aspergillus and Penicillium, have been shown to possess the ability to solubilize sparingly soluble phosphates in vitro by secreting inorganic or organic acids.
References
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Journal ArticleDOI
Fusicoccin: A Tool in Plant Physiology
TL;DR: The model of MECHANISM of action in VITRO is described in this paper as a tool to understand HORMONE action in the context of cell-based networks.
Journal ArticleDOI
H+-Translocating ATPases: Advances Using Membrane Vesicles
TL;DR: Understanding the properties of H/sup +/ -pumping ATPases using membrane vesicles has paved the way for studies to identify secondary active transport systems coupled to the proton electrochemical gradient.
Journal ArticleDOI
Different strategies in higher plants in mobilization and uptake of iron
TL;DR: In the plant kingdom, at least two different strategies exist in the Fe deficiency-induced root responses which lead to enhancement of both iron mobilization in the rhizosphere and uptake rate of iron as mentioned in this paper.
Journal ArticleDOI
Obligatory reduction of ferric chelates in iron uptake by soybeans.
TL;DR: Separation and absorption of Fe from Fe(3+)-chelates appear to require reduction of Fe( 3+)-chelate to Fe(2+-chelate at the root, with Fe( 2+) being the principal form of Fe absorbed by soybean.
Journal ArticleDOI
NITROGEN ASSIMILATION AND TRANSPORT IN VASCULAR LAND PLANTS IN RELATION TO INTRACELLULAR pH REGULATION
John A. Raven,F. A. Smith +1 more
TL;DR: In this paper, it was shown that the assimilation of ammonium ion in plant cell cytoplasm produces at least one H+ per NH+4; N2 fixation generates 0.1-0.2 H+/OH per N assimilated; NO-3 assimilation produces almost one OH/OH- per NO+3.