Inheritance of pod setting under low temperature in pigeonpea

Six basic populations (P(1), P(2), F(1), F(2), B(1) and B(2)) of 12 crosses involving four susceptible (MAL 17, NDA-1, BHUA 96-13-3 and BHUA 96-21-4) and three tolerant (MAL 19, NDA 99-1 and NDA 49-6) genotypes were analyzed to observe the inheritance of pod setting under low temperature in pigeonpea [Cajanus cajan (L.) millsp]. All the F(1) s bore pods even under low temperature as was evident in tolerant parents indicating the dominancy of pod setting over susceptibility. The F(2) segregation ratio of 3:1 (tolerant : susceptible) indicated that pod setting is governed by single dominant gene. The observations of segregation pattern of B(1) (F(1) x tolerant parents) further confirmed the F(2) ratio since all the plants bore pods under low temperature. Similarly B(2) (F(1) X susceptible parents) also exhibited 1:1 (tolerant: susceptible) segregation further confirmed the F(2) ratio.