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Characterization and Inheritance of Dwarfing Genes of Pigeonpea

Legumes Program, ICRISAT, Patancheru, A.P. 502 324, India
Univ. of Nairobi, Kenya

^* Corresponding author.

Pigeonpea [Cajanus cajan (L.) Millsp.] cultivars have excessive vegetative growth and are not amenable to efficient crop management practices such as foliar insecticide application and mechanized field production. This study was conducted at the ICRISAT Center in India to characterize three easily distinguishable dwarf pigeonpea phenotypes (D₆, PD₁, and PBNA) with respect to some morphological traits and to study the inheritance patterns for dwarfing genes. Six crosses involving the dwarf lines and tall cultivars were studied. In 1986, the parents, F₁, and F₂ generations were grown and in the following year, testcrosses and F₃ progenies were evaluated along with their respective parents. Each population was phenotypically classified relative to parental type as tall or dwarf. The chi-square analyses showed that the dwarf phenotype in each of the three lines was controlled by a single recessive gene in homozygous state. The D₆ and PD₁ lines had similar alleles (t₃t₃) whereas PBNA had a different allele (t^h₃t^h₃) for dwarfness, which was recessive to the D₆/PD₁ allele, thus constituting a multiple allelic series.

Received for publication October 24, 1988.