シンビオティックな窒素固定のエネルギー要求

J H Silsbury¹

¹Department of Agronomy, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia.

Nature

|May 12, 1977

まとめ

豆類豆類豆類豆類豆類

科学分野:

植物生理学植物生理学
バイオケミストリーバイオケミストリー
農業科学農業科学とは

背景:

窒素は植物の成長に不可欠である.
豆類は,大気中の窒素を共生的に固定することができます.
窒素は土壌の窒素から吸収することもできます.

研究の目的:

豆類における共生的な窒素固定と窒素吸収のエネルギーコストを比較する.
シンビオティックな窒素固定と窒素吸収は,エネルギーコストが似ているという仮説を検証する.

主な方法:

改造されたマクリー・メソッドを使用した.
Trifolium subterraneum L. (地下クローバー) で調査されたCO2流出.
ダークCO2の流出を合成およびメンテナンスコンポーネントに分割した.

主要な成果:

シンビオティックな窒素固定と窒素吸収は,同様のエネルギーを必要とします.
光合成の純生産の約15%が窒素の需要に割り当てられています.
窒素の固定と吸収は,合成に関連するCO2流に寄与する.

結論:

シンバイオティックな窒素固定のエネルギーコストは,窒素同化に類似しています.
シンビオティック窒素固定を利用した豆類は,鉱物窒素を使用した豆類と同様の成長係数を示しています.
これは,異なる窒素獲得戦略における同等のエネルギーコストの仮説を裏付けている.

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