THE DISTRIBUTION AND EFFECTS OF GENES CAUSING F₁ WEAKNESS IN ORYZA BREVILIGULATA AND O. GLABERRIMA

Yaw-En Chu ¹ and Hiko-Ichi Oka ²

¹ Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan
² National Institute of Genetics, Misima, Japan 411

Weakness of F₁ plants is frequently found in hybrids between strains of Oryza breviligulata (wild) and O. glaberrima (cultivated rice) endemic to West Africa. A set of two complementary dominant weakness genes, W₁ and W₂, was found to control the observed F₁ weakness. Many breviligulata strains had W₁, while most of the glaberrima and semi-wild strains had W₂ or were free of both. In the weak F₁ plants, tissue differentiation in adventitious roots seemed to be disturbed. Modifier genes affecting the expression of the weakness genes appear to be present also.

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