Author(s):

Asit Prasad Dash, Devraj Lenka, SK Tripathy and D Swain

Abstract: In this changing climatic scenario, heat stress is playing a significant role in reducing the grain yield of many important crop plants. Being an allogamous crop, the major breeding approach for increasing the productivity of maize is development of superior hybrids. Hence, 45 F₁s generated by crossing 15 heat tolerant double haploid lines with 3 double haploid testers were evaluated along with the parents in a randomized block design with two replications during Summer 2018 at EB II Section, Department of Plant Breeding & Genetics, College of Agriculture, OUAT, Bhubaneswar to estimate the relative heterosis and heterobeltiosis under heat stress. The crosses; ZL155246 × ZL155828, ZL155219 × ZL155828, ZL155235 × ZL154230 and ZL155235 × ZL155828 exhibited highly significant negative relative heterosis as well as heterobeltiosis for days to 50% tasselling and days to 50 % silking. Two crosses viz., ZL155181 × CML451 and ZL155181 × ZL154230 exhibited highly significant negative heterobeltiosis for ASI accompanied with significant positive relative heterosis and heterobeltosis for plant height, ear height, cob length, cob diameter, number of grains per row, 100 grain weight and yield per plant. Most of the crosses exhibited both relative heterosis and heterobeltosis in positive direction for yield and its attributing descriptors signifying the genes controlling these traits with positive effect were dominant. Nine crosses viz., ZL155115 × ZL155828, ZL155115 × CML 451, ZL155122 × ZL155828, ZL155132 × ZL155828, ZL155181 × ZL155828, ZL155181 × CML451, ZL155187 × ZL155828, ZL155201 × ZL155828 and ZL155247 × ZL155828 possessed highly significant positive relative heterosis as well as heterobeltiosis for yield per plant and its attributing traits; plant height, ear height, cob length, cob diameter, number of grain rows per cob, number of grains per row and 100 seed weight.

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