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Updated: Dec 30, 2025

Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean
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Vitamin E in legume nodules: Occurrence and antioxidant function.

David Soba1, Maren Müller2, Iker Aranjuelo1

  • 1Instituto de Agrobiotecnología (IdAB), Consejo Superior de Investigaciones Científicas-Gobierno de Navarra, Spain.

Phytochemistry
|January 22, 2020
PubMed
Summary

Tocochromanols, particularly alpha-tocopherol, are present in legume roots and nodules. Alpha-tocopherol acts as a key antioxidant, enhancing nodule performance under water stress.

Keywords:
AlfalfaFabaceaeGlycine maxLegumesMedicago sativaPea plantsPisum sativumSoybeanTocopherolsVitamin E

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Agricultural Science

Background:

  • Tocochromanols (vitamin E) are well-studied in plant leaves and seeds.
  • Their role in underground tissues like legume roots and nodules remains largely unknown.

Purpose of the Study:

  • To investigate tocochromanol presence and function in legume roots and nodules.
  • To assess the impact of water stress on tocochromanols and nodule performance.

Main Methods:

  • Comparative analysis of tocochromanols in leaves, roots, and nodules of soybean, alfalfa, and pea plants.
  • Measurement of tocochromanol variations under water stress.
  • Evaluation of membrane lipid peroxidation using thiobarbituric acid-reactive substances assay.
  • Assessment of nodule performance via 15N isotope labeling.

Main Results:

  • Alpha-tocopherol was detected in all studied legume organs, with higher concentrations in nodules than roots, but lower than leaves.
  • Water stress increased alpha-tocopherol in soybean nodules, roots, and leaves, and in alfalfa roots.
  • Alpha-tocopherol showed a negative correlation with lipid peroxidation in roots and nodules.
  • Nodule alpha-tocopherol positively correlated with nitrogen (N2) fixation.

Conclusions:

  • Alpha-tocopherol is a significant antioxidant in legume nodules.
  • It plays a crucial role in protecting against oxidative stress and maintaining nodule function, especially under water deficit conditions.