Line x Tester Analysis to Estimate Combining Ability and Heterosis in Bread Wheat (Triticum aestivum L.)

Document Type : Original Article


Agronomy Department, Faculty of Agriculture, Minia University, El-minia, Egypt


COMBINING ability and heterosis were determined in bread wheat through line x tester analysis during two successive seasons: 2020/2021 and 2021/2022 at the Experimental Farm of Faculty of Agriculture, Minia University, Egypt. The two lines, Sids 14 (L3) and Misr 2 (L5) were a good donner for biological yield/plant BY/P in g, no. spikes/plant NS/P and grain yield/plant GY/P in g. Significant positive general combining ability effects estimated for NS/P, GY/P, weight of grains per spike WG/S in g and 1000 grains weight 1000GW in g for line 4 (Misr 1) and line 5 (Misr 2). Sids 12 (T1) was a good donner for BY/P, NS/P, GY/P and 1000GW. Cross L4 × T2 showed significant negative (desirable) specific combining ability for days to heading. Four crosses, L2 × T3, L3 × T1, L3 × T2 and L4 × T1 exhibited significant positive specific combining ability effects for grain yield/plant. For days to heading, cross L3 × T2 showed significant negative heterosis relative to mid-parents and better parent. Six crosses, L3 × T1, L3 × T2, L4 × T1, L4 × T3, L5 × T1 and L5 × T3 showed significant positive heterosis for grain yield/plant over the mid-parents.