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Related Experiment Video

Updated: Jul 19, 2026

Soybean Hairy Root Transformation for the Analysis of Gene Function

Soybean Hairy Root Transformation for the Analysis of Gene Function

Published on: May 5, 2023

Nod factor enhances calcium uptake by soybean.

S Supanjani¹, A Habib, F Mabood

¹Department of Plant Science, McGill University, Macdonald Campus, Sainte Anne de Bellevue, Que, Canada.

Plant Physiology and Biochemistry : PPB

|November 10, 2006

Summary

Rhizobial symbiosis and Nod factors (lipo-chitooligosaccharides, LCOs) enhance calcium uptake in soybean plants. This suggests a role beyond nitrogen fixation, improving early calcium absorption.

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Area of Science:

Plant Biology
Molecular Biology
Biochemistry

Background:

Legume root hair cells exhibit transient calcium increases upon rhizobia inoculation or Nod factor (lipo-chitooligosaccharides, LCOs) application.
Calcium signaling is crucial for legume-microbe interactions.

Purpose of the Study:

To investigate if LCO application and rhizobia inoculation enhance calcium-45 ((45)CaCl(2)) uptake into soybean leaves.
To explore the role of rhizobial symbiosis in modulating plant calcium uptake.

Main Methods:

Soybean seedlings were treated with LCOs or rhizobia in a solution containing (45)CaCl(2).
Radioactivity in leaf samples was measured after 24 hours to quantify calcium uptake.

Main Results:

Application of NodBj-V (C18:1 MeFuc) at 10(-7) M significantly increased (45)Ca(2+) uptake.
Inoculation with Bradyrhizobium japonicum strains 532C and USDA3 enhanced calcium uptake.
A nodC-mutant strain (Bj-168) and non-soybean symbiotic rhizobia did not affect calcium uptake.

Conclusions:

Rhizobial symbiosis improves early calcium uptake in soybean plants, indicating a function beyond nitrogen fixation.
Specific LCOs and effective rhizobial strains are key to enhancing calcium uptake.