Experiments in which related and unrelated plants were grown together reveal the ability of roots to recognize their kin. The ecological and evolutionary implications are tantalizing topics for future studies.
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Callaway, R., Mahall, B. Family roots. Nature 448, 145–146 (2007). https://doi.org/10.1038/448145a
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DOI: https://doi.org/10.1038/448145a