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The stigma of Petunia contains a toxin that stops pollen growth. Pollen in turn has a team of genes that produce antidotes to all toxins except for the toxin produced by the "self" stigma. © Lewis Collard

Recognizing others but not yourself: new insights into the evolution of plant mating

Self-fertilization is an issue, as it prompts inbreeding. Recognition systems that anticipate self-treatment have advanced to guarantee that a plant mates just with a...