Abstract
This investigation was carried out to study the combining ability effects of 18 parents of maize (15 inbred lines and 3 testers) crossed in line x tester scheme for phonological, plant and yield characteristics. A yield trial included the 45 top crosses, 15 inbred lines, 3 testers along with the two check hybrids S.C. 168 and TWC 352. The experiment was conducted at two planting dates on 15th May and 15th June at the Agric. Res. and Experimental Station of the Fac. of Agric., Moshtohor Benha University. The randomized complete blocks design with three replications was used in this study. Significant mean squares due to crosses (C), inbred lines (L), testers (T) and line x tester (LxT) were found for most studied traits of both and across sowing dates. Variance for C, L, T and LxT with sowing dates interaction on the most studied traits was significance. δ2SCA played the major role in determining the inheritance of all traits. The magnitude of the interaction of δ2SCA x sowing date (SD) was generally higher than for δ2 GCA x SD. This finding indicates that non-additive is more affected by SD than additive and additive x additive. Three crosses exhibited significant superiority over high check hybrid S.C. G 168. The best top crosses were T3xL2 and T3xL15 at both and across sowing dates. Also, ten top crosses at combined analysis did not differ significantly than the best check hybrid for the mention trait. L2, L7, L14 and L15 were good general combiners for grain yield plant-1 and L9, L10 and L13 for earliness. The top-cross T1 with each of inbred lines 2, 5 and 6, T2 with each of L1 and L12 and T3 with each of L3,L4 and L12 for earliness; T1xL11, T1xL12, T1xL14, T2xL3, T2xL12 and T3xL2 for grain yield plant -1 gave the best effects.
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Claims 16
Claim · model-written summary
Significant mean squares for crosses, inbred lines, testers and line x tester were found for most traits.
- Outcome
- mean squarese1
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“Significant mean squares due to crosses (C), inbred lines (L), testers (T) and line x tester (LxT) were found for most studied traits”
Claim · model-written summary
The variance for crosses, lines, testers and line x tester was significant for most traits across sowing dates.
- Outcome
- Variance for C, L, T and LxT with sowing dates interactione2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e2“Variance for C, L, T and LxT with sowing dates interaction on the most studied traits was significance”
Claim · model-written summary
The specific combining ability variance played the major role in determining the inheritance of all traits.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e3“δ2SCA played the major role in determining the inheritance of all traits”
Claim · model-written summary
The magnitude of the SCA x sowing date interaction was generally higher than that of the GCA x sowing date interaction.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e4“The magnitude of the interaction of δ2SCA x sowing date (SD) was generally higher than for δ2 GCA x SD”
Claim · model-written summary
Non-additive effects are more affected by sowing date than additive and additive x additive effects.
- Treatment
- SDe5
- Outcome
- non-additivee5
- Direction
- more affectede5
- Comparator
- additive and additive x additivee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e5“This finding indicates that non-additive is more affected by SD than additive and additive x additive”
Claim · model-written summary
Three crosses showed significant superiority over the high check hybrid S.C. G 168.
- Material
- Three crossese6
- Outcome
- superioritye6
- Direction
- superioritye6
- Comparator
- high check hybrid S.C. G 168e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e6“Three crosses exhibited significant superiority over high check hybrid S.C. G 168”
Claim · model-written summary
T3xL2 and T3xL15 were the best top crosses at both and across sowing dates.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e7“The best top crosses were T3xL2 and T3xL15 at both and across sowing dates”
Claim · model-written summary
Ten top crosses at combined analysis did not differ significantly from the best check hybrid for the mention trait.
- Material
- ten top crossese1
- Outcome
- mention traite1
- Direction
- did not differ significantlye1
- Comparator
- the best check hybride1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“ten top crosses at combined analysis did not differ significantly than the best check hybrid for the mention trait”
Claim · model-written summary
L2, L7 and L14 were good general combiners for grain yield per plant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“L2, L7, L14 and L15 were good general combiners for grain yield plant-1”
Claim · model-written summary
L15 was a good general combiner for grain yield per plant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“L2, L7, L14 and L15 were good general combiners for grain yield plant-1”
Claim · model-written summary
L9, L10 and L13 were good general combiners for earliness.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“L9, L10 and L13 for earliness”
Claim · model-written summary
Top-cross T1 with inbred lines 2, 5 and 6 gave the best effects for earliness.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“The top-cross T1 with each of inbred lines 2, 5 and 6, T2 with each of L1 and L12 and T3 with each of L3,L4 and L12 for earliness”
Claim · model-written summary
Top-cross T2 with inbred lines L1 and L12 gave the best effects for earliness.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“The top-cross T1 with each of inbred lines 2, 5 and 6, T2 with each of L1 and L12 and T3 with each of L3,L4 and L12 for earliness”
Claim · model-written summary
Top-cross T3 with inbred lines L3, L4 and L12 gave the best effects for earliness.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“The top-cross T1 with each of inbred lines 2, 5 and 6, T2 with each of L1 and L12 and T3 with each of L3,L4 and L12 for earliness”
Claim · model-written summary
Top-crosses T1xL11, T1xL12 and T1xL14 gave the best effects for grain yield per plant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“T1xL11, T1xL12, T1xL14, T2xL3, T2xL12 and T3xL2 for grain yield plant -1 gave the best effects”
Claim · model-written summary
Top-crosses T2xL3, T2xL12 and T3xL2 gave the best effects for grain yield per plant.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Maize Inbred Lines”
e1“T1xL11, T1xL12, T1xL14, T2xL3, T2xL12 and T3xL2 for grain yield plant -1 gave the best effects”