Nuclear DNA amount, growth, and yield parameters in maize
D P Biradar1, D G Bullock, A L Rayburn
1Agronomy Department, University of Illinois, 320 Plant and Animal Biotechnology Laboratory, 1201 W. Gregory, 61801, Urbana, IL, USA.
Summary
Maize nuclear DNA content significantly impacts its agronomic potential. Higher DNA amounts correlate with reduced growth and yield in Zea mays, suggesting the nucleotype influences crop performance.
Area of Science:
- Plant genetics
- Agronomy
- Maize breeding
Background:
- Nuclear DNA content varies extensively in Zea mays (maize).
- Understanding this variation's impact on agronomic potential is crucial for crop improvement.
Purpose of the Study:
- To investigate the relationship between nuclear DNA amount and agronomic traits in southwestern US maize populations.
- To assess the influence of nucleotype on maize growth and yield parameters.
Main Methods:
- Collected yield and growth data from 12 open-pollinated maize populations.
- Grew populations in replicated plots under controlled conditions.
- Analyzed correlations between nuclear DNA amount and various growth/yield parameters at 30 and 60 days after planting (DAP).
Main Results:
- All measured growth and yield parameters showed a negative correlation with nuclear DNA amount.
- These negative correlations were more pronounced at 60 DAP compared to 30 DAP.
- Agronomically significant traits like ear weight, seed weight, and seed number per plant were negatively correlated with DNA content.
Conclusions:
- The nucleotype significantly influences the agronomic phenotype in maize.
- Nuclear DNA amount is a key factor in determining maize performance.
- Further research is warranted to fully elucidate the role of nucleotype in maize breeding.
