Additive-dominance genetic model analyses for late-maturity alpha-amylase activity in a bread wheat factorial crossing population

作者：Rasul Golam^*; Glover Karl D; Krishnan Padmanaban G; Wu Jixiang; Berzonsky William A; Ibrahim Amir M H

来源：Genetica, 2015, 143(6): 671-680.

DOI：10.1007/s10709-015-9864-z

• Late-maturity alpha-amylase
• Bread wheat
• Additive-dominance
• Heterosis
• General combining ability
• Specific combining ability

Elevated level of late maturity alpha-amylase activity (LMAA) can result in low falling number scores, reduced grain quality, and downgrade of wheat (Triticum aestivum L.) class. A mating population was developed by crossing parents with different levels of LMAA. The F-2 and F-3 hybrids and their parents were evaluated for LMAA, and data were analyzed using the R software package 'qgtools' integrated with an additive-dominance genetic model and a mixed linear model approach. Simulated results showed high testing powers for additive and additive x environment variances, and comparatively low powers for dominance and dominance x environment variances. All variance components and their proportions to the phenotypic variance for the parents and hybrids were significant except for the dominance x environment variance. The estimated narrow-sense heritability and broad-sense heritability for LMAA were 14 and 54 %, respectively. High significant negative additive effects for parents suggest that spring wheat cultivars 'Lancer' and 'Chester' can serve as good general combiners, and that 'Kinsman' and 'Seri-82' had negative specific combining ability in some hybrids despite of their own significant positive additive effects, suggesting they can be used as parents to reduce LMAA levels. Seri-82 showed very good general combining ability effect when used as a male parent, indicating the importance of reciprocal effects. High significant negative dominance effects and high-parent heterosis for hybrids demonstrated that the specific hybrid combinations; Chester x Kinsman, 'Lerma52' x Lancer, Lerma52 x 'LoSprout' and 'Janz' x Seri-82 could be generated to produce cultivars with significantly reduced LMAA level.

• 出版日期2015-12