Molecular diversity based heterotic groups in pigeonpea [Cajanus cajan (L.) Millsp.]
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Authors
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Bharathi Mudaraddi
Jawaharlal Nehru Technological University, Hyderabad, 500 085, Telangana
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K.B. Saxena
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502 324, Telangana
Abstract
A set of 155 hybrid parents was characterized at molecular level using 24 simple sequence repeat (SSR) markers.The number of alleles amplified ranged from 3 to 41 at an average of 14.5 alleles per marker and mean polymorphic information content (PIC) value of 0.64.Based on genetic diversity,three
heterotic groups were constituted. Male sterile (A) lines were distributed into two heterotic groups, while the fertility restorer (R) lines formed three heterotic groups. Of the 135 restorers studied, 51 (37.78%) were classified in heterotic
group I, and 75 (55.56%) in heterotic group II. Six interspecific derivatives and three other genotypes constituted the heterotic group III. These observations indicated the presence of limited genetic diversity among A and R lines. Based on the present results, it is recommended that for breeding high yielding pigeonpea hybrids, more attention be given to develop new genetically diverse hybrid parents.