光強度および赤色光/遠赤色光比の違いがコマツナの硝酸イオン濃度および硝酸還元酵素活性に及ぼす影響  [in Japanese] Effects of Light Intensity and Red/Far-red Photon Flux Ratio on Nitrate Concentration and Nitrate Reductase Activity in Komatsuna  [in Japanese]

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Author(s)

    • 壇 和弘 Dan Kazuhiro
    • 九州沖縄農業研究センター野菜花き研究部 National Agricultural Research Center for Kyushu Okinawa Region
    • 大和 陽一 Yamato Yoichi
    • 九州沖縄農業研究センター野菜花き研究部 National Agricultural Research Center for Kyushu Okinawa Region

Abstract

光強度および赤色光 (R)/遠赤色光 (FR) 比を変えた光環境がコマツナ (<i>Brassica campestris</i>品種‘はるみ小松菜’, ‘楽天’) の硝酸イオン濃度および硝酸還元酵素 (NR) 活性に及ぼす影響について調査した. コマツナは, 異なる光強度 (PPFD 165, 290, 350, 510 μmol・m<sup>-2</sup>・sec<sup>-1</sup>) あるいは異なるR/FR比 (1.01: 対照区, 0.66: R抑制区, 1.50: FR抑制区) の光環境下で1/2単位および1単位の培養液を用いて養液栽培した. 異なる光強度でコマツナを生育させたところ, ‘はるみ小松菜’の硝酸イオン濃度は光強度の増加とともに低下し, 非リン酸化NR活性は光強度の増加とともに高まった. ‘楽天’では, 1/2単位の培養液を用いた試験区において, 光強度の増加とともに硝酸イオン濃度は低下し, 非リン酸化NR活性は高まったが, 1単位の培養液を用いた試験区では, 光強度が増加しても硝酸イオン濃度はほとんど低下せず, 非リン酸化NR活性も変化しなかった. R/FR比を変えてコマツナを生育させたところ, 1/2単位の培養液を用いたR抑制区でのみ硝酸イオン濃度の低下が認められた.

The effects of light intensity and altered red (R)/far-red (FR) photon flux ratio on nitrate concentration and nitrate reductase (NR) activity in komatsuna (<i>Brassica campestris</i> L. cv. ‘Harumi komatsuna’ and ‘Rakuten’) were investigated. Komatsuna was hydroponically grown in full or half strength nutrient solution under different light intensities (PPFD of 165, 290, 350 and 510 μmol · m<sup>-2</sup> · s<sup>-1</sup>) and different R/FR ratios (1.01: control, 0.66: R-intercepted and 1.50: FR-intercepted) conditions. When komatsuna was grown under different light intensities, the nitrate concentration in ‘Harumi komatsuna’ was decreased with increases in light intensity, and the actual NR activity was increased with increase in light intensity. In ‘Rakuten’, the nitrate concentration was decreased and the actual NR activity was increased by increased light intensity at half strength nutrient solution. At full strength nutrient solution, the nitrate concentration was hardly decreased and the actual NR activity did not change with increase in light intensity. When komatsuna was grown under different R/FR ratio conditions, reduction of nitrate concentration was observed only in R-interceptive-treated komatsuna grown with half strength nutrient solution.

Journal

  • Horticultural Research (Japan)

    Horticultural Research (Japan) 4(3), 323-328, 2005

    THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE

Cited by:  4

Codes

  • NII Article ID (NAID)
    110001828167
  • NII NACSIS-CAT ID (NCID)
    AA11608561
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1347-2658
  • NDL Article ID
    7484903
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z74-C757
  • Data Source
    CJPref  NDL  NII-ELS  IR  J-STAGE  NDL-Digital 
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