Pigeonpea [Cajanus cajan (L.) Mill.] is an important legume consumed in the Caribbean basin. Cultivars with indeterminate flowering habit have sensitivity to the photoperiod in Puerto Rico. The objectives of this research were to: (1) develop two breeding lines with indeterminate flowering habit that can be planted year-round, and (2) evaluate their agronomic performance. IIPG-7 and IIPG-11 breeding lines, derived from the bi-parental cross ‘ICPL 86012’/‘Guerrero’, were developed by pedigree and bulk breeding methods. Both breeding lines, their parents, and cultivars checks were tested in field trials in Isabela and Lajas, Puerto Rico in 2022 and 2023. IIPG-7 and IIPG-11 were early genotypes that initiated flowering between 73-84 days after planting (dap), and reached harvesting maturity at 121-127 dap compared with indeterminate cultivars ‘Ariel’, ‘Blanco Yauco’, ‘Kaki’, ‘Pinto Berrocales’, and ‘Super Pinto’ that initiated flowering between 91 to 102 dap and reached maturity at 138-148 dap. These cultivars had seed yield values over 1,000 kg/ha while IIPG-7 and IIPG-11 produced between 721 to 1,010 kg/ha under short day conditions in both locations. In contrast, IIPG-7 and IIPG-11 were the only indeterminate genotypes that initiated flowering between 42-88 dap, reached maturity between 88-172 dap, and seed yields varied from 626 to 2,449 kg/ha under long day conditions in Isabela and Lajas. These new breeding lines can be used to develop pigeonpea cultivars with insensitivity to the photoperiod.
