[Extrakaryotic inheritance of pollen sterility in Oenothera].

In crossbreeding tests we obtained plants having the B · l genome of Oenothera berteriana and the extrakaryotic genes of Oenothera blandina. The plants showed complete male sterility. The fertility of the female sex also was extremely low. The condition of fertility remained unchanged after further crossbreeding tests with the genomes B ♂ and l ♂. According to these results the male sterility and the decreased fertility of the female sex is due to incompatible interaction between the karyotic genes of Oenothera berteriana and the extrakaryotic genes of Oenothera blandina.