Correlation of leaf nitrogen, chlorophyll and rubisco contents with photosynthesis in a supernodulating soybean genotype Sakukei 4

Tomiya Maekawa, Makie Kokubun

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Soybean requires more nitrogen (N) than gramineous crops because it accumulates a large amount of N in seeds, and its photosynthetic rate per leaf N is low. The supernodulating genotype Sakukei 4 has a superior symbiotic N 2 fixation capability, and thereby is potentially high-yielding. In our previous study, Sakukei 4 was characterized by having a superior ability to maintain high leaf N content and high photosynthetic rate. The objectives of this study were to know photosynthetic characteristics of Sakukei 4 in detail, especially, the responses to CO2 concentration and light intensity, and to elucidate how the photosynthetic characteristics of Sakukei 4 are associated with the amounts of photosynthesis-related N compounds (chlorophyll and Rubisco). The three genotypes (Sakukei 4 - supernodulating cultivar derived from Enrei, Enrei - normally nodulating cultivar, En1282-non-nodulating line derived from Enrei) were grown at various N levels in this study. The CO 2 exchange rate (CER) in Sakukei 4 was higher than, or equal to that in Enrei at wide ranges of CO2 concentrations (150-700 μmol mol-1) and light intensities (200-1,500 μmol m-2 s -1 PPFD). Sakukei 4 had higher leaf N (NL), chlorophyll (ChlL) and Rubisco (RubL) contents per leaf area, but lower chlorophyll and Rubisco contents per leaf N content (Chl L/NL, RubL/NL) than Enrei. The specific leaf weight (SLW) and leaf area trended to be lower in Sakukei 4 than in Enrei. These results indicate that the superior photosynthetic rate in Sakukei 4 is attributed to higher total N, chlorophyll and Rubisco contents per leaf area, but not to high rate of allocation of total N to these N compounds.

    Original languageEnglish
    Pages (from-to)419-426
    Number of pages8
    JournalPlant Production Science
    Volume8
    Issue number4
    DOIs
    Publication statusPublished - 2005 Dec 1

    Keywords

    • Chlorophyll
    • Glycine max
    • Leaf nitrogen
    • Photosynthesis
    • Rubisco
    • Soybean
    • Supernodulation

    ASJC Scopus subject areas

    • Agronomy and Crop Science

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