Nitrogen-fixing activity of root nodules in relation to their size in peanut (Arachis hypogaea L.)

Ryosuke Tajima, O. New Lee, Jun Abe, Alexander Lux, Shigenori Morita

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


The nitrogen-fixing activity of root nodules was examined with reference to the nodule size in peanut. Root nodules of field-grown peanut were collected at flowering through harvesting stages and classified into five groups of size using a circle template. Then acetylene reduction activity was measured to evaluate nitrogen-fixing activity for respective size groups. In addition, the diameter of the cross-section of each root nodule and rhizobium-infected areas on the cross-section were measured. The results showed that the nitrogen-fixing activity of root nodules is closely related with their size. In the root nodules in the medium size group (1.5- 2.0 mm in diameter), nitrogen-fixing activity per unit fresh weight of nodule was highest at the flowering stage and rapidly decreased thereafter. The nitrogen-fixing activity of root nodules larger than 2.0 mm in diameter did not vary significantly with their size. Colors of rhizobium-infected zones varied with their size: white in small nodules; red in medium-sized nodules; and greenish in larger nodules, which suggests that the concentration of leghemoglobin is highest in the medium-sized nodules. Nitrogen-fixing activities of the medium-sized nodules might determine the amount of nitrogen fixation in the whole root system during pod-filling because medium-sized nodules had high activity and were large in number. Classification of root-nodule size based on the circle template is a simple, rapid, and useful method to evaluate nitrogen-fixing activity of root nodules.

Original languageEnglish
Pages (from-to)423-429
Number of pages7
JournalPlant Production Science
Issue number4
Publication statusPublished - 2007
Externally publishedYes


  • Acetylene reduction activity
  • Nitrogen-fixing activity
  • Nodule diameter
  • Peanut (Arachis hypogaea L.)
  • Rhizobia

ASJC Scopus subject areas

  • Agronomy and Crop Science


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