Rhizosphere acidification as a response to iron deficiency in bean plants

Iron deficiency in higher plants causes accumulation of salts of organic acids in the roots, the most characteristic being citrate. We show that citrate and malate accumulate in beans (Phaseolus vulgaris L. var Prélude), not because of a lack of the iron-containing enzyme aconitase (EC 4.2.1.3), but...

Full description

Saved in:
Bibliographic Details
Published in:Plant physiology (Bethesda) 1986-07, Vol.81 (3), p.842-846
Main Authors: Vos, C.R. de, Lubberding, H.J, Bienfait, H.F
Format: Article
Language:English
Subjects:
ACIDIFICACION
ACIDIFICATION
Agronomy. Soil science and plant productions
Biological and medical sciences
CITRATE
CITRATES
CITRATOS
Deficiencies. Phytotoxicity of elements. Salinity
DEFICIENCY DISEASES
Economic plant physiology
ELECTRON TRANSFER
ENFERMEDADES CARENCIALES
FER
FONCTION PHYSIOLOGIQUE
FUNCION FISIOLOGICA
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
HIERRO
IRON
Leaves
MALADIE DE CARENCE
MALATE
MALATES
MALATOS
Mineral nutrition
NETHERLANDS
Nutrient solutions
Nutrition. Photosynthesis. Respiration. Metabolism
Organic acids
PAISES BAJOS
PAYS-BAS
PHASEOLUS VULGARIS
Phloem
PHYSIOLOGICAL FUNCTIONS
Plant physiology and development
Plant roots
Plants
proton excretion
Protons
RHIZOSPHERE
RIZOSFERA
SALES
SALTS
SEL
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Water and solutes. Absorption, translocation and permeability
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Iron deficiency in higher plants causes accumulation of salts of organic acids in the roots, the most characteristic being citrate. We show that citrate and malate accumulate in beans (Phaseolus vulgaris L. var Prélude), not because of a lack of the iron-containing enzyme aconitase (EC 4.2.1.3), but in close coupling to the extrusion of protons during rhizosphere acidification, one of the 'Fe-efficiency' reactions of dicotyledonous plants. When proton excretion is induced in roots of control bean plants by addition of fusicoccin, only malate, not citrate, is accumulated. We propose that iron deficiency induces production of organic acids in the roots, which in beans leads to both proton excretion and an increased capacity to reduce ferric chelates via the induced electron transfer system in the root epidermis cells.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.81.3.842