Heterosis for Fruit Yield and Heat Tolerance Traits in Tomato (Lycopersicon Lycopersicum Mill.) Under Field Conditions

Abstract

rainy season to estimates heterosis for fruit yield and heat tolerance traits of tomato under field conditions. The experiment comprised two heat tolerant (Icrixina and Rio Grande) and four heat susceptible tomato (Tima, Tropimech, Petomech and Roma Savana) which were crossed Journal of Agricultural Studies ISSN 2166-0379 2018 http://jas.macrothink.org 50 using half diallel mating design in the screen house. The resultant 15 hybrids, their parental lines along with four checks were laid out in partially balanced lattice design with three replications. Analysis of variance revealed significant variation among the genotypes for all traits except fruit diameter and cell membrane thermostability, indicating sufficient variability existed among the genotypes. The cross combinations Icrixina × Rio Grande, Icrixina × Tima, Icrixina × Roma Savana and Icrixina × Petomech were found heterotic over better parent for fruit yield and heat tolerance traits (Number of branches per plant, number of clusters per plant, number of flowers per cluster, number of fruits per cluster, number of fruits per plant, percentage fruit set and chlorophyll content) among the hybrids. These hybrids were superior over better parent have the potentiality to be exploited for developing commercial heat tolerant tomato hybrid under field conditions.

Studies of heterosis and inbreeding depression for growth parameters in tomato hybrids (Solanum lycopersicum L)

“…The highest percentage of standard heterosis was observed in the cross Kashi Aman×SEL-7 (48.40%) followed by VRT-06×SEL-7 (43.84%) and Kashi Aman×H-86 (36.99%). The similar findings were also observed by Droka et al (2012) [15] , Shalaby (2013) [15] , Amin et al (2017) [16] , Hamisu (2018) [17] and Mishra et al (2021) [18] in tomato. The hybrid vigour displayed in F1 generally breaks down in F2 and subsequent generations owing to segregation of the favourable genes that regulate the development of the vigour.…”