Effect of CO2 concentration, temperature and n fertilization on biomass production of soybean genotypes differing in N fixation capacity

Toshinori Matsunami, Masafumi Otera, Shun Amemiya, Makie Kokubun, Masumi Okada

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    13 Citations (Scopus)

    Abstract

    We tested the hypothesis that elevated CO2 concentration [CO2]-induced enhancement of biomass production of soybean is greater in a genotype that has a higher nitrogen (N) fixation capacity. Furthermore, we analyzed the interactive effects of N fertilization, temperature and [CO 2] on biomass production. Three genetically related genotypes: Enrei (normally-nodulating genotype), Kanto 100 (supernodulating genotype), and En1282 (non-nodulating genotype) were grown in pots, with or without N fertilizer for two years (2004, 2005). They were then subjected to two different [CO 2] (ambient and elevated (ambient+200 μmol-1)) × two temperature regimes (low, high (low + 4∼5°C)). Top dry weight at maturity was the greatest in the elevated [CO2]×high temperature regime, irrespective of genotype and N fertilization. The [CO 2] elevation generally enhanced N acquisition and dry matter production during the vegetative growth stage, and the enhancement was more pronounced in the nodulating genotypes (Enrei and Kanto 100) than in the non-nodulating genotype (En1282), indicating that N supply through N fixation contributes to elevated [CO2]-induced biomass production in soybean. However, the relative responsiveness of biomass production to elevated [CO 2] was not necessarily higher in the supernodulating genotype than the normally-nodulating genotype. The N utilization efficiency to produce biomass was inferior in the supernodulating genotype than in the normally-nodulating and non-nodulating genotypes. These results did not fully verify the hypothesis that elevated [CO2]-induced enhancement of biomass production of soybean is greater in a genotype with a higher N fixation capacity.

    Original languageEnglish
    Pages (from-to)156-167
    Number of pages12
    JournalPlant Production Science
    Volume12
    Issue number2
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Biomass production
    • Elevated [CO]
    • High temperature
    • N fixation
    • Photosynthesis
    • Soybean (Glycine max)
    • Supernodulation

    ASJC Scopus subject areas

    • Agronomy and Crop Science

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