2026 選修生物II CH4-4-3 植物開花光週期之秘辛

詳細解釋植物如何利用光敏素（Phytochrome）系統來感知環境信息，並以此調控其生命週期中的關鍵事件。核心內容圍繞光週期現象展開，指出植物是透過測量連續不被打擾的黑暗期長度來判斷季節和決定是否開花，而非白天長度。闡述光敏素如何以Pr和Pfr兩種可逆型態作為分子開關來計時，並揭示長期懸而未決的開花素（Florigen）之謎，確認其本質是一種名為FT蛋白的移動信使。此外，光敏素系統的調控功能超越了開花，還影響著種子萌發、去黃化以及避蔭反應等廣泛的生理過程。聽完後可以自主進行線上測驗，檢視學習成效喔~(需要登入gemini) 測驗網址 https://g.co/gemini/share/3877518e37fd Powered by Firstory Hosting

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2026 選修生物II CH4-4-3 植物開花光週期之秘辛

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