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Rhizobiumの結節化シグナルに反応する植物の根毛にカルシウムが突入する
D W Ehrhardt1, R Wais, S R Long
1Howard Hughes Medical Institute, Department of Biological Sciences, Stanford University, California 94305-5020, USA.
Cell
|May 31, 1996
まとめ
リゾビウム・リポキトオリゴサカライド (LCO) 信号分子は,豆類の根毛にカルシウムピークを誘発し,ノドルの発達の重要なステップです. これらのカルシウムスパイクが欠けているノードル化しない変異体は,初期の信号知覚の欠陥を示唆しています.
科学分野:
- 植物と微生物の相互作用
- 植物における分子信号伝達
- 豆類のシンビオシスです.
背景:
- 豆類の共生には,窒素を固定する根の結節を形成するRhizobium細菌が含まれています.
- リゾビウムからのリポチオオリゴサッカライド (LCO) 信号分子がこの共生を開始します.
- LCOsの正確な植物ベースの信号伝達経路は,ほとんど不明のままです.
研究 の 目的:
- LCO信号分子に対する植物反応における細胞質カルシウムの役割を調査する.
- LCO誘発のカルシウムスパイクが結節形成に欠かせないかどうかを判断する.
- ノードル化しないアルファルファ変異体におけるカルシウムシグナル伝達を調べるために.
主な方法:
- ホストの根毛に注射されたカルシウムに敏感なレポーター染料を使用した.
- 細胞プラズマカルシウムの変動を検知し,定量化するために画像分析を使用しました.
- 野生型および変異性アルファルファのLCOに対するカルシウムスパイク反応を評価した.
主要な成果:
- LCOの適用は,遅延後,根毛内のサイトプラズマカルシウムの局所的,周期的なスパイクを誘発しました.
- 結節反応を誘発するLCOの構造的要件は,カルシウムスパイキングの構造要件と同一でした.
- ノードル化しないアルファルファ変異体は,LCO誘発カルシウムスパイキングの完全な欠如を示した.
結論:
- サイトプラズマカルシウムスパイキングは,ライゾビウムLCO信号に対する豆類の根毛の迅速かつ早期の反応である.
- カルシウムスパイキングは,ノードル化プロセスの必要な構成要素であり,信号知覚に関与する可能性が高い.
- ノードル化しない突然変異体のカルシウムスパイキングの欠陥は,初期のLCO信号の知覚または伝導の阻害を示しています.
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