Line x tester analysis to estimate combining ability and heterosis in bread wheat (Triticum aestivum L.) [electronic resource]

Includes bibliographic reference

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.

Keywords: Bread wheat, Heterosis, Line x tester, Mid-parents, Specific combining ability

Summary in Arabic