Heterosis and inbreeding depression for agro-morphological characters in tomato, Lycopersicon esculentum Mill Sahu M*, Sahu KK1, Tirkey A, Padayay DU1, Mehta N Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur-492012, Chhattisgarh, India 1Department of Horticulture, Indira Gandhi Krishi Vishwavidyalaya, Raipur-492012, Chhattisgarh, India *Email forcorrespondence: mayuri.igkv@gmail.com
Online published on 25 July, 2018. Abstract Line x tester mating design was used to determine heterotic cross combinations in tomato. Heterosis and inbreeding depression in twenty seven crosses from twelve diverse parents and genetic variability studies were carried out during Rabi 2006–2008. The heterobeltiosis and standard heterosis were obtained for fruit yield and its components. Hybrid RCMT-1/DVRT-2, JTP-02-07/DVRT-2 for days to 50 per cent flowering, RCMT-1/DVRT-2 for determinate type of plant habit, Pant T-8/CO-3 and KS-227/CO-3 for fruit set (%), RCMT-1/CO-3 for number of fruits per plant, Pant T-8/DVRT-2 and JTP-02-07/DVRT-2 for average fruit weight (g) and Local-2/DVRT-2 for total fruit yield/plant (kg) were reported promising on the basis of all types of heterosis. However the highest heterobeltiosis was observed in Improved Shalimar/CO-3, Local-2/DVRT-2 and Pant T-8/DVRT-2 and standard heterosis in Local-2/DVRT-2 and Pant T-8/DVRT-2 for total fruit yield per plant. A high degree of heterosis for other traits in desired direction was also observed. The inbreeding depression for fruit yield was found high in fourteen hybrids while only five hybrids viz Local-2/CO-3, KS-229/Cherry Raipur, Imp Shalimar/DVRT-2, Pant T-8/CO-3 and Local-2/DVRT-2 exhibited significant negative inbreeding depression indicating slight improvement in F2. Top Keywords Tomato, heterosis, inbreeding depression, earliness, agromorphological characters. Top |