不產氧光合作用（英語：Anoxygenic photosynthesis）是指不以水為電子供體，而不產生氧氣的光合作用。其光反應與碳反應均與產氧光合作用有所不同。常見的替代水作為光反應電子供體的物質是硫化氫，其產物是糖類和硫單質（取代了氧氣），如下反應式：
- CO2+H2S→C6H12O6+S+H2O
參考文獻
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