Plants may lose green color as they mature if enzymes that degrade chlorophyll are activated.

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As plants mature, enzymes that degrade chlorophyll may become activated, leading to the loss of green color. This may happen during the senescence process, where the plant's leaves and other organs undergo programmed cell death and nutrient recycling. As chlorophyll breaks down, other pigments like carotenoids may become more visible, leading to changes in leaf color.

Plants May Lose Green Color as They Mature If Enzymes