Nitrogen-Fixing Activity of Root Nodules in Relation to Their Size in Peanut (Arachis hypogaea L.)(Crop Physiology and Ecology)

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概要

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• 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 (1.5-2.0mm 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 2.0mm 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.

• 日本作物学会の論文

著者

• Morita Shigenori

  Field Production Science Center, Graduate School of Agricultural and Life Sciences, The University o

• Abe Jun

  AE-Bio, Graduate School of Agricultural and Life Sciences, The University of Tokyo

• Morita Shigenori

  Field Production Sci. Center Graduate School Of Agricultural And Life Sciences The Univ. Of Tokyo

• Lee O

  Field Production Science Center Graduate School Of Agricultural And Life Sciences The University Of

• Tajima Ryosuke

  Field Production Science Center, Graduate School of Agricultural and Life Sciences, The University o

• Lux Alexander

  Field Production Science Center, Graduate School of Agricultural and Life Sciences, The University o

• Lux Alexander

  Field Production Science Center Graduate School Of Agricultural And Life Sciences The University Of

• Abe Jun

  Ae-bio Graduate School Of Agricultural And Life Sciences The Univ. Of Tokyo

• Tajima Ryosuke

  Field Production Science Center Graduate School Of Agricultural And Life Sciences The University Of

• Lux Alexander

  Department Of Plant Physiology Faculty Of Natural Sciences Comenius University

• Morita Shigenori

  Field Production Science Center Graduate School Of Agricultural And Life Sciences The University Of

• Morita Shigenori

  Graduate School Of Agricultural And Life Sciences The Univ. Of Tokyo.

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