HETEROSIS AND COMBINING ABILITY ANALYSIS IN INTRASPECIFIC HYBRIDS OF LOCAL AND EXOTIC TOMATO (Solanum lycopersicum L.) GENOTYPES

Abstract

The present study was conducted in order to estimate heterosis and combining ability in intraspecific hybrids of some tomato genotypes at Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh, during the period of November, 2017 to March, 2018. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications which included six tomato genotypes viz. G1

(SAU tomato 1), G2

(SAU tomato 2), G3

(SL001), G4

(SL002), G5

(BARI Tomato 2) and G6 (SL 003). Data was collected and analyzed for 10 characters viz. days to first flowering, days to 50% flowering, plant height at 50% flowering, number of cluster per plant, number of fruit per cluster, number of fruits per plant, fruit length, individual fruit weight, fruit diameter and locule number per plant. Seedlings of 31 days old were transplanted to main field. G2 showed significant negative GCA for days to 1 st and 50% flowering and significant positive heterosis for number of fruits per plant. In case of hybrids, the lowest days required for 1 st flowering was observed in G2XG6 and 50% flowering in G6XG5. Highest number of fruits was observed in G2XG6 and G3XG5 showed the lowest number of fruits per plant. G2XG3, G2XG4, G2XG5 and G2XG6 showed significant higher number of fruits per plant over better parent. In case of days to first flowering G1XG4, G2XG4, G2XG4, G4XG2, G5XG4 and G6XG4 showed significant negative heterosis over better parent and G2XG3, G2XG4 and G4XG2 showed significant negative heterosis over mid parent. G4XG1 and G6XG1 showed significant positive SCA for plant height at 50% flowering. G2 showed significant positive SCA for most of the characters both cased as female or male parent.