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It is well known that the leaves of many woody plant species flush red rather than green during particular stages across their life span. Non-green leaf coloration caused by active synthesis of anthocyanin in plant organs at these stages costs the plant significant resources and energy, resulting in a reduction of primary photosynthesis. Therefore, it is likely that the coloration change is an active process and not simply a by-product of metabolism. Various hypotheses formulated to explain thedoi:10.17520/biods.1994045 fatcat:vg2irugd25ggtkmmkwxuq3bpuq