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  • Nitrogen fixation and seed yield in soybean under moderate high-temperature stress.

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    Author(s) : Shiraiwa, T.Sakashita, M.Yagi, Y.Horie, T.

    Author Affiliation : Graduate School of Agriculture, Kyoto Univ., Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.

    Author Email : shiraiwa@kais.kyoto-u.ac.jp

    Journal article : Plant Production Science 2006 Vol.9 No.2 pp.165-167 ref.10

    Abstract : An experiment was conducted in JapanjapanSubject Category: Geographic Entities
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    in 2002 to investigate the effect of high temperatures on N fixation and seed yield in soyabean (cv. Tachinagaha) under well-watered and water-limited conditions. The field was longitudinally divided into three temperature plots (T1 to T3) and each temperature plot was further divided into two subplots of 4 m each in length for the dry (D) and wet (W) soil moisture treatments. The average air temperatureair temperatureSubject Category: Properties
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    during the treatment period was from 24.2°C in the D subplot in T1 to 28.2°C in the W subplot in T3 and the lowest temperature was almost the same as the normal outdoor temperature in Kyoto for the season. The averaged values of stomatal conductance for the treatment period were 0.66 and 0.44 mol m-2 s-1 in the W and D subplots, respectively. The seed yield tended to decline with the increase in mean air temperature during seed filling, resulting in 30% lower yields in T3 compared with T1 for both W and D subplots. The mean temperature in T2 and T3 was approximately 30°C during the major seed filling periodfilling periodSubject Category: Time Periods
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    . Both biomassbiomassSubject Category: Miscellaneous
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    yield and harvest indexharvest indexSubject Category: Properties
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    (HI) tended to decline as the temperature rose, but the response of HI to the high temperature was more consistent than that of biomass yield. The variation in N accumulation among treatments was attributable to varied N fixation activity. The maximum soil temperaturesoil temperatureSubject Category: Properties
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    exceeded 30°C on 12 days during the 32-day period in the D subplot in T3, while it did only on two days in the W subplot in T3. In any case, N fixation was reduced by the high temperature conditions evidently under the water-limited condition. The results indicate that a temperature 3-4°C higher than normal level for Kyoto during seed filling possibly causes a substantial decline of soyabean yield associated with reduced N fixation activity, especially when the soil watersoil waterSubject Category: Miscellaneous
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    is not sufficient.

    ISSN : 1343-943X

    DOI : 10.1626/pps.9.165

    Record Number : 20063089083

    Publisher : Crop Science Society of Japan

    Location of publication : Tokyo

    Country of publication : Japan

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : Glycine (Fabaceae)glycine (fabaceae)Subject Category: Organism Names
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    , Glycine maxglycine maxSubject Category: Organism Names
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    Descriptor(s) : air temperatureair temperatureSubject Category: Properties
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    , biomassbiomassSubject Category: Miscellaneous
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    , crop yieldcrop yieldSubject Category: Properties
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    , filling periodfilling periodSubject Category: Time Periods
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    , harvest indexharvest indexSubject Category: Properties
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    , leaf conductanceleaf conductanceSubject Category: Miscellaneous
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    , nitrogen fixationnitrogen fixationSubject Category: Natural Processes
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    , seedsseedsSubject Category: Anatomical and Morphological Structures
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    , soil temperaturesoil temperatureSubject Category: Properties
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    , soil watersoil waterSubject Category: Miscellaneous
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    , soyabeanssoyabeansSubject Category: Commodities and Products
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    , stomatastomataSubject Category: Anatomical and Morphological Structures
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    , stressstressSubject Category: Miscellaneous
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    , stress responsestress responseSubject Category: Miscellaneous
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    , temperaturetemperatureSubject Category: Properties
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    , water deficitwater deficitSubject Category: Properties
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    , water stresswater stressSubject Category: Miscellaneous
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    Identifier(s) : soil moisture, soybeanssoybeansSubject Category: Commodities and Products
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    Geographical Location(s) : JapanjapanSubject Category: Geographic Entities
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    Broader term(s) : PapilionoideaepapilionoideaeSubject Category: Organism Names
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    , FabaceaefabaceaeSubject Category: Organism Names
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    , FabalesfabalesSubject Category: Organism Names
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    , eudicotseudicotsSubject Category: Organism Names
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    , angiospermsangiospermsSubject Category: Organism Names
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    , SpermatophytaspermatophytaSubject Category: Organism Names
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    , plantsplantsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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    , Glycine (Fabaceae)glycine (fabaceae)Subject Category: Organism Names
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    , APEC countriesapec countriesSubject Category: Institutions and Organisations
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    , Developed Countriesdeveloped countriesSubject Category: Miscellaneous
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    , East Asiaeast asiaSubject Category: Geographic Entities
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    , AsiaasiaSubject Category: Geographic Entities
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    , OECD Countriesoecd countriesSubject Category: Institutions and Organisations
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