Studies on Seed Technological Approaches in Hybrid Pigeonpea Cajanus cajan L Millsp

Abstract

Field experiment was conducted at MARS, Dharwad on effect of growth regulators on newlineseed yield and quality of pigeonpea hybrid during 2010-11 and 2011-12. Second experiment newlinewas conducted at Dharwad, Bijapur and Bagalkot on stability performance of ten genotypes newlineand third experiment with three sowing dates at two locations was conducted for flowering newlinebehaviour of four genotypes. Varietal characterization was studied in Department of Seed newlineScience and Technology, UAS-Dharwad. Foliar spraying of planofix at 0.5 ml/l recorded newlinemaximum number of flowers retained (305.33), pod number (303.3), pod yield (78.58 g and newline3143 kg) and seed yield (57.75 g and 2310 kg) per plant and hectare with least flower drop newline(76.88 %) and higher 100 seed weight (11.71 g), germination (88.79 %), seedling length newline(25.88 cm) and vigour index (2299) followed by miraculan at 1 per cent. Similar significant newlineeffects were recorded for growth regulators sprayed at flower initiation stage and interaction newlineeffect. Among the ten genotypes, ICPR-3762 was found highly stable for growth parameters newlinewhile, ICPH-2740 and ICPR-3762 found stable for yield parameters at three locations based newlineon regression coefficient (bi), regression deviation (S2di) and mean values. At Dharwad and newlineBagalkot locations, June 15th sowing recorded significantly higher pod number per plant newline(349.18 and 317.93), seed yield (70.33 and 56 g) per plant and (2813 and 2240 kg) per newlinehectare. Among the four genotypes, ICPA-2043 recorded higher seed yield per plant and newlinehectare at both locations. Morphological characterization of eleven genotypes based on seed, newlineseedling and phenological characters was done. It was found more reliable for varietal newlineidentification. Eleven genotypes were grouped into three clusters and greater similarity newlinewithin clusters was noticed. Genotypes ICPH-2671, ICPH-2740, ICPR-2671 and ICPR-2740 newlinewere in Cluster-I; ICPA-2043, ICPA-2047 and ICPA-2092 in Cluster-II; ICPH-3762, ICPH- newline3461, ICPR-3762 and ICPR-3461 in Cluster -III sharing maximum genetic similarity. newline