関連する実験動画
Updated: May 5, 2026

09:23
Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 15, 2016
13.5K
新しいトリプトファンに依存した経路経由によるオクシンの急速な合成は,植物の影を避けるために必要である
Yi Tao1, Jean-Luc Ferrer, Karin Ljung
1Howard Hughes Medical Institute, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Cell
|April 9, 2008
まとめ
影回避症候群を経験している植物は,特定のオクシン経路を活性化します. TAA1酵素は,この経路を開始し,幹の伸びなどの重要な影回避反応のための迅速なオクシン生成を可能にします.
科学分野:
- 植物生物学 植物生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 植物は,濃厚な天幕で赤から遠赤の光の比率 (R:FR) の低下を検知します.
- この光信号は,影回避症候群 (SAS) を引き起こす.
- SASは茎の伸び,枝の伸びを抑制し,花期を加速する.
研究 の 目的:
- アラビドプシスのSASを制御する遺伝的要因を特定する.
- アクシン生物合成におけるTAA1遺伝子の機能を特徴づける.
- SASにおける新しいオクシン経路の役割を明らかにする.
主な方法:
- アラビドプシスの遺伝子スクリーンは,変異SASを持つ突然変異者を識別する.
- TAA1.1の酵素活性を決定する生化学的測定法.
- オクシン生物合成経路の分析.
主要な成果:
- 複数のSAS応答に欠陥のあるアラビドプシス変異種が特定されました.
- TAA1は,L-トリプトファン (L-Trp) からインドル-3-ピルビック酸 (IPA) の形成を触媒するアミノトランスフェラーゼとして記述されています.
- 実証されたTAA1は,SASにとって極めて重要な重要なオキシン生物合成経路を起動します.
結論:
- TAA1は,日陰を避けるときにオキシンの生成を開始するのに不可欠です.
- この経路は,SASに必要な高レベルのオクシンを素早く合成します.
- TAA1の理解は,光の競争に対する植物の反応についての洞察を提供します.
関連する概念動画
C4 Pathway and CAM
38.0K
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...
38.0K
Light Acquisition
8.0K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.0K
Photoreceptors and Plant Responses to Light
22.5K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
22.5K
Cell Signaling in Plants
4.5K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
4.5K
Amino Acid Biosynthetic Pathways
1.8K
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
1.8K
Repressible Operon: trp Operon
2.7K
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
2.7K

