Introgression and repeated co-option facilitated the recurrent emergence of C4 photosynthesis among close relatives.

Abstract excerpt

The origins of novel traits are often studied using species trees and modeling phenotypes as different states of the same character, an approach that cannot always distinguish multiple origins from fewer origins followed by reversals. We address this issue by studying the origins of C4 photosynthesis, an adaptation to warm and dry conditions, in the grass Alloteropsis. We dissect the C4 trait into its components,...

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