Abstract
L.) productivity in many parts of southern Africa. The line × tester mating design was used to determine the general combining ability (GCA) for grain yield of 14 maize inbred lines and the specific combining ability (SCA) of their corresponding crosses. Thirty-three single-cross hybrids were evaluated under acid and optimum soils across 11 environments over three seasons. Across environments, mean grain yield reduction ranged from 11 to 37% due to low pH. Additive gene action was more important than nonadditive gene action for grain yield under both soil conditions. Tester GCA effects were larger for grain yield than GCA effects of lines and SCA effects of crosses for both soil conditions. Tester GCA effects were less sensitive to environmental fluctuations than line GCA effects and SCA effects of crosses. Cross combinations with desirable SCA effects for grain yield were associated with high per se grain yield, which suggests that SCA was a good predictor of grain yield in this study. These crosses consisted of good × good and good × poor general combiners, which indicates that GCA was a good predictor of grain yield. Therefore, priority should be given for yield selection in progenies and hybridization of specific crosses with desirable SCA when breeding acid-soil-tolerant maize.
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Claims 7
Claim · model-written summary
Low pH reduced mean grain yield by 11 to 37% across environments.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across environments, mean grain yield reduction ranged from 11 to 37% due to low pH”
t0“maize”
Claim · model-written summary
Additive gene action was more important than nonadditive gene action for yield in both soil conditions.
- Outcome
- Additive gene action was more important than nonadditive gene action for grain yielde0
- Qualifier
- under both soil conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additive gene action was more important than nonadditive gene action for grain yield under both soil conditions”
t0“maize”
Claim · model-written summary
Tester GCA effects for yield exceeded line GCA and cross SCA effects in both soils.
- Outcome
- Tester GCA effects were larger for grain yield than GCA effects of lines and SCA effects of crossese0
- Qualifier
- for both soil conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tester GCA effects were larger for grain yield than GCA effects of lines and SCA effects of crosses for both soil conditions”
t0“maize”
Claim · model-written summary
Tester GCA effects were less sensitive to environment than line GCA effects and cross SCA effects.
- Outcome
- Tester GCA effects were less sensitive to environmental fluctuations than line GCA effects and SCA effects of crossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tester GCA effects were less sensitive to environmental fluctuations than line GCA effects and SCA effects of crosses”
t0“maize”
Claim · model-written summary
Crosses with desirable SCA effects for yield had high per se grain yield.
- Material
- Cross combinations with desirable SCA effects for grain yielde0
- Outcome
- high per se grain yielde0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cross combinations with desirable SCA effects for grain yield were associated with high per se grain yield”
t0“maize”
Claim · model-written summary
The crosses included good by good and good by poor general combiners.
- Outcome
- good × good and good × poor general combinerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These crosses consisted of good × good and good × poor general combiners”
t0“maize”
Claim · model-written summary
The authors recommend yield selection in progenies and hybridization of crosses with desirable SCA.
- Outcome
- yield selection in progenies and hybridization of specific crosses with desirable SCAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“priority should be given for yield selection in progenies and hybridization of specific crosses with desirable SCA when breeding acid-soil-tolerant maize”
The same questions in other papers
ph · yield · Zea mays (maize)Positive and negative results
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