Title: Study of inheritance of fertility restoration in pigeonpea lines derived from <i>Cajanus cajanifolius</i>
Abstract: With 1 table Abstract In this study, single crosses involving four CMS lines and three known fertility restorers were studied to determine the genetics of fertility restoration in pigeonpea ( Cajanus cajan L. Millsp.). The F 1 plants of all the four hybrids were selfed to produce F 2 seed and simultaneously crossed to their corresponding A lines to produce BC 1 F 1 seeds during 2007. The parents, F 1 , F 2 and BC 1 F 1 populations were planted in 2008 rainy season at the Marathwada Krishi Vidyapeeth, Parbhani, India. The interaction of dominant nuclear genes of ICP 2766 with ICPA 2092 produced 100% fertile F 1 plant and showed complete dominance for fertility restoration. The restorer ICP 2766 when crossed with ICPA 2092 showed monogenic inheritance (3 : 1), while ICP 2766 crossed with ICPA 2043 revealed digenic inheritance (15 : 1) of fertility restoration. In a cross between ICP 2766 and ICPA 2043, dominant gene of fertility restoration at either of two loci masked the expression of male‐sterile recessive alleles at two loci in such a way that it modified normal dihybrid ratio into 15 : 1 ratio and produced duplicate gene interaction.