Combining ability analysis over F1-F 5 generations in diallel crosses of bread wheat

Area of Science:

• Plant Breeding
• Genetics
• Agricultural Science

Background:

• Understanding gene action is vital for improving crop yield.
• Diallel crosses are a key method for assessing parental combining abilities.

Purpose of the Study:

• To evaluate general and specific combining abilities for grain yield and component traits in bread wheat (Triticum aestivum L.).
• To determine the role of additive and non-additive gene effects in trait inheritance across generations F1-F5.

Main Methods:

• Conducted diallel crosses with seven diverse bread wheat cultivars.
• Analyzed combining ability variances and gene effects over five generations (F1-F5).
• Assessed breeding values based on F2 progeny bulks for predicting advanced generation performance.

Main Results:

• General and specific combining ability variances were significant for most traits across generations.
• Additive gene effects predominated for yield component traits, while grain yield showed a balance of additive and non-additive effects.
• Parental breeding values remained relatively consistent across generations.

Conclusions:

• Additive gene effects are important for wheat yield components, with a mix of additive and non-additive effects for grain yield.
• F2 progeny bulk performance reliably predicts advanced generation hybrid performance, offering a cost-effective breeding strategy.