関連する実験動画
Updated: Sep 9, 2025

14:43
Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis
Published on: July 23, 2014
13.4K
窒素欠乏は成長に影響し,トウモロコシの炭素代謝を調節する
Joseph N Amoah1, Claudia Keitel2, Brent N Kaiser2
1School of Life and Environmental Sciences, University of Sydney, 380 Werombi Road, Brownlow Hill, Camden, NSW, 2570, Australia. joseph.amoah@sydney.edu.au.
Planta
|September 2, 2025
まとめ
トウモロコシの低窒素は 糖分と粉の代謝を促進し 根の成長を促します 葉の炭水化物の蓄積は,シンク組織の非効率的な利用を示唆し,窒素不足の下でのトウモロコシの成長に影響を与えます.
科学分野:
- 植物生理学
- 生物化学
- 分子生物学
背景:
- 炭素 (C) の代謝と分布に影響を与えるため,窒素の利用可能性は植物発達に極めて重要です.
- 異なる窒素形態がCの配分を制御する方法を理解することは作物の成長を最適化するための鍵です.
- 異なるN条件下でのC利用と分割のメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- 低窒素 (N) がトウモロコシの炭素固定,利用,空間分布に与える影響を調査する.
- 炭素代謝と遺伝子発現におけるNの調節作用を解明する.
- 炭水化物の分割と根から芽への配分にN欠乏がどう影響するかを決定する.
主な方法:
- 低窒素,中性窒素,高窒素,低アンモニアの4種類のN処理によるトウモロコシの水栽培
- 溶解糖と粉の含有量,酵素活動,バイオマス配分の測定
- C代謝に関連する遺伝子発現パターンの分析
主要な成果:
- 低窒素処理により,溶性砂糖と粉の含有量が大きくなり,芽のバイオマスを犠牲にして根のバイオマスが増加しました.
- 根から芽へのアシミレート配分と糖/粉代謝遺伝子 (例えば,ZmSPS1,ZmSuSy1) のアップレギュレーションが低Nで観察された.
- 炭水化物の蓄積は,吸収が損なわれることより,シンク組織におけるCの非効率的な利用を示した.
結論:
- トウモロコシの窒素が少ないと,糖と粉の代謝と遺伝子発現が促進され,芽の根のバイオマスと炭水化物の蓄積が増加します.
- アシミレートに対する根の競争は,低Nで激化し,シンク組織への転移が減少する.
- シンク組織におけるC利用の改善は,N不足のストレスを軽減し,トウモロコシの成長を促進するために重要です.
さらに関連する動画
関連する概念動画
Key Elements for Plant Nutrition
21.2K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
21.2K
Inorganic Nitrogen Assimilation
104
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
104
Overview of Nitrogen Metabolism
8.5K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
8.5K
Overview of Metabolism
31.9K
Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
31.9K
Meristems and Plant Growth
46.9K
Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
46.9K
C4 Pathway and CAM
46.2K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
46.2K

