Purpose of description

ICPM 93006, ICPM 93007, and ICPM 93008 are short-duration male-sterile pigeonpea germplasm lines that are being used extensively in developing shortduration pigeonpea hybrids. The world's first pigeonpea hybrid, ICPH 8, was developed by using ICPM 93006 as the female parent and the second, IPH 732, by using ICPM 93008 as the female parent. A l l the three lines were used in producing several promising hybrids, which are under multilocational trials in India. These lines are also being used for population improvement in pigeonpea.

Origin and development

ICPM 93006 and I C PM 93007 were developed by crossing MS3A w i th a shortduration pigeonpea cultivar, namely, Prabhat. The F2 heterozygous (MS ms) segregants were crossed to Prabhat (as female parent) to produce BC1F1. From BC1F2 population, determinate and indeterminate male-sterile (ms ms) plants were selected for backcrossing, using Prabhat as a recurrent parent. After five backcrosses, the determinate (ICPM 93006) and indeterminate (ICPM 93007) male-sterile lines were maintained by sibbing. ICPM 93008 was developed by crossing MS3A with an indeterminate short-duration cultivar T 21 and following the same procedure described above.