HETEROTIC ANALYSIS FOR QUANTITATIVE AND QUALITATIVE TRAITS IN TOMATO (Solanum lycopersicum L.) GENOTYPES

Abstract

The experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh during the period of November 2018-April 2019 and November 2019-April 2020 to study the heterosis over better and mid parent in intraspecific cross among ten tomato parental lines. Twenty-four F 1 was generated from ten parental lines in first year experiment and the heterosis was estimated for quantitative and qualitative traits using the ten parents and twentyfour

F 1 using Randomized Complete Block Design with three replications. Analysis of variance showed the significant differences among the genotypes for all the agromorphological characters except for number of leaves per plant, leaf area and number of branches per plant. Fruit pH, fruit Brix content and leaf chlorophyll content showed significant differences among the genotypes. G1×G7 showed highest plant height (130.17 cm) and early fruit setting (37.33 DAT). Early flowering (18.33 DAT) and early maturity (83 DAT) were found in G4×G1 and G3×G10 respectively. Highest number flowers per clusters per plant (9.95) and number of fruits per cluster (7.36) were found in G2×G10 and G4×G10 respectively. G7×G10 showed highest number of cluster (41.33) and fruits per plant (320.5). G4×G1 showed the highest single fruit weight (165.54 g) and yield per plant (8.88 kg). G1×G3 showed the highest fruit Brix% (4.5) and fruit pH (5.08) and G4×G5 showed the lowest pH (3.14). G1×G5 showed the highest leaf chlorophyll content (65.03). Heterosis analysis revealed some crossed lines with superiority over their parental lines. G5×G10 showed the highest heterosis over mid (37.28) and better parent (30.62) for plant height. G2×G10, G5×G10 and G9×G10 crossed lines showed the early flowering (42.72), fruit setting (-30.65) and maturity (-19.38) in term of heterosis over better

parent. G1×G8 showed the highest heterosis over mid parent (65.30) and better

parent

(56.27) for number of clusters per plant. G5×G10 showed the highest heterosis over mid parent number of fruits per plant (219.78) and yield per plant (233.38). G10×G2 showed the highest heterosis over mid (73.56) and better parent (191.14) for fruit weight. In case of qualitative traits, highest heterosis over better parent and mid parent for fruit Brix% (52.03 and 121.67), fruit shelf life (85.78 and 88.30) and leaf chlorophyll content (28.45 and 35.78) were found in G1×G3, G4×G5 and G1×G5 respectively. G4×G1, G1×G7, G5×G10 and G1×G3 could be suggested for early flowering, fruit setting, highest yield per plant and fruit Brix content respectively.