Assessment of Combining Ability in Some Newly Maize Inbred Lines for Grain Yield and Late Wilt Resistance

Document Type : Original Article

Authors

Maize Research Department, Field crop Research institute, ARC, Egypt

Abstract

Twenty new yellow maize inbred lines were crossed to two testers (Sk-3 and SC 177) during 2017 season. The resulting forty crosses and two checks (SC168 and TWC 368) were evaluated in two trials during 2018 season. The first trial for grain yield, days to 50% silking and plant height traits was conducted at Sakha and Sids Research Stations, the second trial in nursery late wilt field under two nitrogen levels (60 and 120 unit) at Sakha Research Station. The mean squares due to lines (L), testers (T), lines x tester (L x T) and their interaction with locations in the first trial and nitrogen levels in the second trial were significant for most traits. The non-additive gene effects were the most important component control the inheritance of all studied traits except days to 50% silking. The best inbred line for general combining ability effects was L-7 for days to 50% silking, L-19 for taller plants and grain yield while, inbred line L-5 was the best for late wilt resistance. The desirable hybrids for specific combining ability effects were L-20 x Sk-3 and L-16 x SC 177 for grain yield and late wilt resistance. Two single crosses L-10 x Sk-3 and L-20 x Sk-3 were significantly out-yield compared to the check SC 168. Meanwhile, one three-way cross L-5 × SC 177 was significant out-yield than check TWC 368. These hybrids could be considered as promising crosses in the hybrids breeding program and require further testing.

Keywords

Journal of Plant Production
Volume 13, Issue 2
February 2022
Pages 45-48

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