Abstract
Among plants grown from buckwheat "seeds" which had been exposed to X rays or thermal neutrons two thrum-flowered plants each had a branch bearing modified flowers. One thrum plant had a branch bearing homostyled flowers and the other a branch bearing pin flowers. A thrum plant in the progeny of the latter plant was self-fertile, produced no progeny in crosses with other thrum plants, but was fertile in crosses with pin-flowered plants. These cases are discussed in relation to a postulated S supergene controlling incompatibility in buckwheat.
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