COMBINING ABILITY AND HETEROSIS FOR SEED YIELD AND YIELD RELATED TRAITS IN CANOLA UNDER DIFFERENT NITROGEN LEVELS

Document Type : Original research

10.12816/ejpb.2021.220556

Abstract

Seven divergent canola genotypes were crossed using a half diallel mating design to determine the mean performance, types of combining abilities, and heterosis under different nitrogen levels for agronomic traits, in Ismailia Agricultural Research Stations, Agricultural Research Center, Egypt. The parents and their F1 crosses were evaluated using a randomized complete block design with three replicates. The GCA/SCA ratio at different nitrogen levels revealed a predominance of additive gene action for the all of the investigated traits. Under all nitrogen levels, P1 for seed weight per plant and P7 for seed oil content were the best general combiners. The generated combinations (P2 × P3) at 30 kg/feddan nitrogen level, (P3 × P5) under 45 kg/feddan nitrogen level, and (P1× P4) under 60 kg/feddan nitrogen level had high and positive SCA effects and mid parent heterosis for seed weight per plant. Moreover, under all nitrogen levels, the combination (P5×P7) had high and positive SCA effects and mid parent heterosisfor seed oil content.

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