Responses of a supernodulating soybean genotype, Sakukei 4 to nitrogen fertilizer

Tomiya Maekawa, Motoki Takahashi, Makie Kokubun

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    The supernodulating soybean genotype Sakukei 4 is potentially high-yielding. We characterized its leaf nitrogen (N) content, photosynthesis and growth at different developmental stages and under different dosages and types of N fertilizer, and compared it with its parental cultivar Enrei and the non-nodulating line En1282. At the pod-expansion and seed-filling stages, the N contents per leaf dry weight and per leaf area, and apparent photosynthetic rates (AP) were higher in Sakukei 4 than in the normal and the non-nodulating genotypes. The nodule activity per plant was also higher in Sakukei 4 than in Enrei during the reproductive stage. These traits varied less with the growing condition (field- or pot-grown) and dose or type of N fertilizer applied in Sakukei 4 than in the other genotypes. The superior ability of Sakukei 4 to maintain high leaf N and AP, however, did not enhance its growth performance, which tended to be inferior to that of Enrei. Further studies are needed to define the cultivation conditions optimal for an exploitation of the favorable traits of Sakukei 4.

    Original languageEnglish
    Pages (from-to)206-212
    Number of pages7
    JournalPlant Production Science
    Volume6
    Issue number3
    DOIs
    Publication statusPublished - 2003 Sep

    Keywords

    • Glycine max
    • Leaf nitrogen
    • Nitrogen response
    • Photosynthesis
    • Soybean
    • Supernodulation

    ASJC Scopus subject areas

    • Agronomy and Crop Science

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