Genetic studies in rice (Oryza sativa L.). XV. inheritance of nature of node and culm angle

Inheritance studies in a cross D 6-2-2 X HY-256 Purple in rice indicated that bent node was dominant over normal and was due to four interacting genes of which two were complementary designated as Bn_a and Bn_b, one inhibitory gene, I-Bn, and one anti-inhibitory gene, Ai-Bn, to give the segregation ratio of 117 bent:139 normal nodes. For culm angle, erectness was recessive to spreading/semispreading and was due to five interacting genes of which there were complementary duplicate genes designated as Er_a1, Er_a2 and Er_a3, and two inhibitory duplicate genes, I-Er₁ and I-Er₂, to give the segregation ratio of 54 erect: 970 semispreading/spreading culms. An analysis of the combined segregation data revealed the independence of these two characters.