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Diallel and prediction (REML/BLUP) for yield components in intervarietal maize hybrids
I R Carvalho1, A J de Pelegrin2, V J Szareski3
1Centro de Genômica e Fitomelhoramento, Universidade Federal de Pelotas, Capão do Leão, RS, Brasil carvalho.irc@gmail.com.
Genetics and Molecular Research : GMR
|September 6, 2017
Summary
Genetic improvement in maize (Zea mays L.) yield components relies on understanding gene actions. This study identified key parental lines and crosses for enhancing grain yield and quality through diallel analysis.
Area of Science:
- Agricultural Science
- Plant Breeding
- Genetics
Background:
- Genetic improvement is crucial for increasing maize (Zea mays L.) grain yield components.
- Crosses exploit intervarietal heterosis, allelic complementarity, and gene actions for enhanced yield.
Purpose of the Study:
- To estimate variance components and genetic parameters using REML/BLUP in an intervarietal diallel.
- To select and predict superior genotypes for maize yield components.
Main Methods:
- A randomized block design with 60 intervarietal maize hybrids from 14 parentals was used.
- A diallel scheme evaluated traits: grain volume relative index, 100-grain mass, and grain yield.
- REML/BLUP (Restricted Maximum Likelihood/Best Linear Unbiased Prediction) methods were applied.
Main Results:
- Male parents and additive gene action determined grain volume relative index.
- Specific combining ability controlled 100-grain mass and grain yield; female parents showed low narrow-sense heritability.
- Taquarão (female) and Argentino Amarelo (male) exhibited best general combining abilities; specific combining abilities were noted in crosses AL 25 x Dente de Ouro Roxo, AL 25 x BRS Pampeano, and Taquarão x Argentino Branco.
Conclusions:
- Genetic estimates and predictions are consistent and applicable to maize breeding programs.
- Findings provide valuable insights for future quantitative genetic studies in maize.
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