Comparison of Genetic Parameters in Non-segregating and Segregating Populations of Sugar Beet in Egypt

Abstract

This work aimed mainly at comparison among non-segregating (P1, P2 and F1) and segregating (F2, BC1 and BC2) generations using genetic parameters for four traits in the cross Eg27 x Fc723 cmsduring 2015 to 2018 in Ras-Sudr station, Desert Research Center (DRC), South Sinai and Private Farm in Kafr El Sheikh Governorate. According to combined analysis of variance, highly significant environments (E) for all studied traits and significant or highly significant genotype (G) and GxE interactions for most traits were observed during six generations. In respect to mean performances, Kafr El-Shiekh location was higher than Ras-Sudr location for most studied traits at six generations. Significant differences among six generation means were found for all studied traits in the two locations. The F2 generation was lower than the P1, P2, F1, BC1 and BC2 generations for most studied traits at the two locations. The cross (Eg27 x Fc723 cms) recorded positive and highly significant heterosis, heterobeltiosis and inbreeding depression for most studied traits under two locations. A high broad sense heritability and genetic advance as percent of mean (GAM%) estimates were observed for root diameter/plant at BC1, root weight/plant at BC2 and T.S.S.% at BC1 and BC2. Generally, the values of the all studied genetic parameters for all studied traits during segregating generations were higher than non-segregating generations. The principal component analysis of the relationship between the six generations revealed that the most appropriate generations for selecting these traits were BC1 and BC2 under the two locations. Backcrossing may be done for 2–5 cycles (BC2 – BC5) at Eg27 parent for improving sugar beet yield in Egypt.