Estimation of genetic components, correlation and path coefficient in some bread wheat genotypes (Triticum aestivum L.).

Six cultivars of bread wheat were used in a half diallel during the three successive seasons of
2020/2021, 2021/2022 and 2022/2023 to study some genetic components, correlations and path
coefficients. Results indicated that Misr 3 (P6) cultivar had the earliest plants in heading (DH), the
shortest plants (PH) and the highest grain yield/plant (GY/P). The greatest grain yield/plant were recorded
by crosses (P4xP6), (P3xP4), (P4xP5), (P1xP4) and (P5xP6) in F1 and crosses (P1xP2), (P1xP6), (P4xP6),
(P2xP4) and (P1xP3) in F2. Grain yield per plant exhibited positive significant genotypic and phenotypic
correlations with number of spikes/plant (NS/P), biological yield/plant (BY/P), harvest index (HI),
number of spikelets/spike (NST/S) and weight of grains/spike (WG/S). Path analysis revealed high and
positive direct effects on grain yield/plant via BY/P, HI, WG/S, NS/P, PH, 1000 grain weight (1000-GW)
and DH. High positive indirect effects were observed for traits; spike length (SL), NS/P, BY/P, NST/S,
weight/spike (WS), number of grains/spike (NG/S) and 1000-GW on grain yield/plant via weight of
grains/spike. It is proved the importance of these traits as selection criteria in improving grain yield in
wheat