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Nature 457, 234 (15 January 2009) | doi:10.1038/7227234b; Published online 14 January 2009

Open Innovation Challenges

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It is more than 100 years since Charles Darwin discovered that hybrid plants such as maize (corn) generally grow to be stronger and larger than their parents. The same is true of allopolyploid plants — those formed by hybridizing two or more types of plant, for example wheat and rye.