Creating plants that do not rely on photosynthesis but still create oxygen

My planet has an increased axial tilt, resulting in crazier winters and summers and higher temperatures. For most places, the temperature never drops below freezing - even in the winter, but the days can be as short as four hours during this time. I want my fauna to reflect this, and rely less on photosynthesis (which will also give me the chance to make everything less green!). However, I also want quite a bit of oxygen in the atmosphere (around 30 percent of it to be this way). I've already looked up fungi and dodder style plants, but they don't appear to create oxygen.

My question is, how could I go about creating plants like this in a scientifically plausible manner?

posted over 7 years ago

Xenobear‭

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