シネージド細胞による花粉管の引き寄せ
T Higashiyama1, S Yabe, N Sasaki
1Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan. higashi@biol.s.u-tokyo.ac.jp
Science (New York, N.Y.)
|August 25, 2001
まとめ
咲く植物の2つの共生細胞は,花粉管を受精のための胚袋に導きます. この引き寄せ信号は受精後に停止し,ポリスペルミーを防ぐ可能性があります.
科学分野:
- 植物の繁殖 植物の繁殖
- 生殖生物学 生殖生物学
- フラワープラントの肥料化 肥料化
背景:
- 胚袋への花粉管の誘導は,開花植物における成功的な受精に不可欠である.
- 胚袋は,ピスティル内の最終的な誘導段階において花粉管を惹きつけるという仮説がある.
研究 の 目的:
- 胚袋に花粉管を惹きつけるシネージド細胞の役割を調査する.
- 配合細胞が花粉管の吸引信号の源であるかどうかを判断する.
主な方法:
- レーザー・セル・アブレーションは,特定のシネージド・セルを除去するために使用されました.
- 配合細胞除去が花粉管の誘導に与える効果が観察されました.
主要な成果:
- 卵細胞に隣接する2つの共生細胞は,花粉管の吸引の源として特定されました.
- 単一のシネージド・セルが,引き寄せ信号を生成し,2つの細胞が,この信号を強化する.
- 授精後に花粉管の引き寄せは停止し,シネージド細胞が1つ残った場合でも.
結論:
- シネージド細胞は受精時に花粉管を惹きつける上で重要な役割を果たします.
- 受精後の引き寄せの停止は,多精子症を予防するメカニズムかもしれません.
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