The hydroxypropionate pathway may have been nature's first attempt at autotrophy in anoxygenic phototrophs.

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The hydroxypropionate pathway is a carbon fixation pathway that has been observed in certain organisms that are capable of anoxygenic photosynthesis. It is believed that this pathway may have been one of nature's first attempts at autotrophy in these types of organisms, before the evolution of oxygenic photosynthesis and the subsequent development of other carbon fixation pathways such as the Calvin cycle.

The Hydroxypropionate Pathway May Have Been Nature's First Attempt at Autotrophy