Root Exudation of Organic Acids: Importance to Nutrient Availability and the Calcifuge and Calcicole Behaviour of Plants

Oikos ◽  
1997 ◽  
Vol 80 (3) ◽  
pp. 459 ◽  
Author(s):  
Lena Ström ◽  
Lena Strom
Keyword(s):  
Organic Acids ◽  
Nutrient Availability ◽  
Root Exudation

Root Exudation of Organic Acids of Herbaceous Pioneer Plants and Their Growth in Sterile and Non-Sterile Nutrient-Poor, Sandy Soils from Post-Mining Sites

Pedosphere ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Katja BOLDT-BURISCH ◽  
Bernd Uwe SCHNEIDER ◽  
M. Anne NAETH ◽  
Reinhard F. HÜTTL
Keyword(s):  
Organic Acids ◽  
Root Exudation ◽  
Sandy Soils ◽  
Mining Sites ◽  
Pioneer Plants

LC–MS analysis of low molecular weight organic acids derived from root exudation

2010 ◽  
Vol 400 (8) ◽  
pp. 2587-2596 ◽  
Author(s):  
Leonhard Jaitz ◽  
Bernhard Mueller ◽  
Gunda Koellensperger ◽  
Daniela Huber ◽  
Eva Oburger ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Root Exudation ◽  
Low Molecular Weight ◽  
Ms Analysis

Differences between calcifuge and acidifuge plants in root exudation of low-molecular organic acids

1994 ◽  
Vol 167 (2) ◽  
pp. 239-245 ◽  
Author(s):  
L. Str�m ◽  
T. Olsson ◽  
G. Tyler
Keyword(s):  
Organic Acids ◽  
Root Exudation

scholarly journals Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

2021 ◽  
Vol 12 ◽  
Author(s):  
Mahreen Yahya ◽  
Ejaz ul Islam ◽  
Maria Rasul ◽  
Iqra Farooq ◽  
Naima Mahreen ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Organic Acids ◽  
Root Exudation ◽  
Principal Component ◽  
Phosphate Solubilizing Bacteria ◽  
Root Tips ◽  
Wheat Varieties ◽  
P Deficiency ◽  
Phosphate Solubilizing

Phosphorous (P) deficiency is a major challenge faced by global agriculture. Phosphate-solubilizing bacteria (PSB) provide a sustainable approach to supply available phosphates to plants with improved crop productivity through synergistic interaction with plant roots. The present study demonstrates an insight into this synergistic P-solubilizing mechanism of PSB isolated from rhizosphere soils of major wheat-growing agro-ecological zones of Pakistan. Seven isolates were the efficient P solubilizers based on in vitro P-solubilizing activity (233-365 μg ml–1) with a concomitant decrease in pH (up to 3.5) by the production of organic acids, predominantly acetic acid (∼182 μg ml–1) and gluconic acid (∼117 μg ml–1). Amplification and phylogenetic analysis of gcd, pqqE, and phy genes of Enterobacter sp. ZW32, Ochrobactrum sp. SSR, and Pantoea sp. S1 showed the potential of these PSB to release orthophosphate from recalcitrant forms of phosphorus. Principal component analysis indicates the inoculation response of PSB consortia on the differential composition of root exudation (amino acids, sugars, and organic acids) with subsequently modified root architecture of three wheat varieties grown hydroponically. Rhizoscanning showed a significant increase in root parameters, i.e., root tips, diameter, and surface area of PSB-inoculated plants as compared to uninoculated controls. Efficiency of PSB consortia was validated by significant increase in plant P and oxidative stress management under P-deficient conditions. Reactive oxygen species (ROS)-induced oxidative damages mainly indicated by elevated levels of malondialdehyde (MDA) and H2O2 contents were significantly reduced in inoculated plants by the production of antioxidant enzymes, i.e., superoxide dismutase, catalase, and peroxidase. Furthermore, the inoculation response of these PSB on respective wheat varieties grown in native soils under greenhouse conditions was positively correlated with improved plant growth and soil P contents. Additionally, grain yield (8%) and seed P (14%) were significantly increased in inoculated wheat plants with 20% reduced application of diammonium phosphate (DAP) fertilizer under net house conditions. Thus, PSB capable of such synergistic strategies can confer P biofortification in wheat by modulating root morphophysiology and root exudation and can alleviate oxidative stress under P deficit conditions.

scholarly journals The effect of microorganisms and heavy metals on the exudation of low molecular weight organic compounds by plant roots

2020 ◽  
Author(s):  
A. A. Belimov ◽  
◽  
A. I. Shaposhnikov ◽  
D. S. Syrova ◽  
T. S. Azarova ◽  
...  
Keyword(s):  
Amino Acids ◽  
Organic Acids ◽  
Root Exudation ◽  
Wild Type ◽  
Variovorax Paradoxus ◽  
Combined Action ◽  
Growth Promoting ◽  
Pea Mutant ◽  
Microbial Systems ◽  
Organic Acids And Sugars

The aim of our research was to study the effect of growth-promoting rhizobacteria (Pseudomonas oryzihabitans and Variovorax paradoxus) and toxic elements (Al, Cd and Hg) on the root exudation in various pea (Pisum sativum L.) genotypes. For this, methods of periodic cultures, gnotobiotic plant-microbial systems, ICPE and UPLC were used. It was established that rhizobacteria actively utilized organic acids and sugars secreted by the roots and contributed to an increase in pH and Al immobilization in the rhizosphere. Cadmium increased the exudation of many substances of pea line SGE, but this effect was more pronounced in the mutant SGECdt. Stimulation of the exudation of amino acids was detected during Hg treatment to a greater extent in wild-type SGE. The combined action of Cd and Hg did not lead to a further increase in exudation. The results obtained indicate various mechanisms of exudation of the studied fractions, while the most pronounced differences are observed between the fractions of amino acids or sugars with organic acids. Exudation of organic acids plays an important role in the decreased stability and accumulation of Hg by the pea mutant SGECdt.

Organic acid exudation associated with aluminium stress tolerance in triticale and wheat

2003 ◽  
Vol 54 (10) ◽  
pp. 979 ◽  
Author(s):  
X. G. Zhang ◽  
R. S. Jessop ◽  
D. Alter
Keyword(s):  
Organic Acids ◽  
Organic Acid ◽  
Stress Tolerance ◽  
High Performance ◽  
Root Exudation ◽  
Enzymatic Assay ◽  
Root Tips ◽  
Al Tolerance ◽  
Al Stress ◽  
Organic Acid Exudation

Three triticale cultivars differing in aluminium (Al) stress response, together with 1 Al-tolerant wheat cultivar (Carazinho) and 1 Al-tolerant wheat line (ET3), were used to investigate the root exudation of organic acids during Al stress. The likely relationship of organic acid exudation with Al tolerance, as assessed by root regrowth in nutrient solutions, was also examined. An enzymatic assay was used to detect malate release from both root tips and the whole root system; high performance liquid chromatography (HPLC) was also used to measure the exudation of organic acids from Al-stressed root tips. The enzymatic assay revealed some associations between Al tolerance and malate efflux from Al-stressed wheat or triticale roots, although Al-tolerant triticale cvv. Tahara and 19th ITSN 70-4 released less malate than the Al-tolerant wheat. HPLC analysis indicated that malate and citrate were not the main exudates related to the different levels of Al tolerance in these triticale cultivars. A yet to be identified organic acid in 19th ITSN 70-4 showed significant concentration differences from 2 other cultivars tested. This study highlighted the importance and necessity of elucidating the biochemical mechanisms involved in Al stress tolerance in triticale and other crops.

Effect of enhanced UV-B radiation on methane emission in a paddy field and rice root exudation of low-molecular-weight organic acids

2016 ◽  
Vol 15 (6) ◽  
pp. 735-743 ◽  
Author(s):  
Yongmei He ◽  
Fangdong Zhan ◽  
Yuan Li ◽  
Weiwei Xu ◽  
Yanqun Zu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acids ◽  
Methane Emission ◽  
Paddy Field ◽  
Root Exudation ◽  
Rice Paddy ◽  
Rice Root ◽  
Low Molecular Weight ◽  
Notable Effect ◽  
Solar Uv

Solar UV-B radiation had a notable effect on the emission of CH4 from a rice paddy, of which the mechanism was related to its influence on the excretion by roots of LMWOAs in the rhizosphere.

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