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Path Coefficient and Principal Component Analyses for Biomass Allocation, Drought Tolerance and Carbon Sequestration
Kwame W Shamuyarira1, Hussein Shimelis1, Sandiswa Figlan2
1School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg 3201, South Africa.
Plants (Basel, Switzerland)
|June 10, 2022
Summary
Selecting wheat genotypes with higher root biomass can improve drought tolerance and carbon sequestration. Kernels per spike (KPS) and total plant biomass (PB) are more effective selection criteria than root-to-shoot ratio (RS) for optimizing ideotypes.
Area of Science:
- Agricultural Science
- Plant Breeding
- Agronomy
Background:
- Root biomass allocation is a key trait for developing drought-tolerant crops and enhancing soil carbon sequestration.
- Bread wheat (Triticum aestivum L.) ideotype selection requires understanding the relationship between root biomass and yield components.
Purpose of the Study:
- To assess the relationship between root biomass and yield components in bread wheat.
- To identify influential traits for optimizing genotype selection for biomass allocation, drought tolerance, and carbon sequestration.
Main Methods:
- Evaluated 100 wheat genotypes (10 parents, 90 F2 families) under drought-stressed and non-stressed conditions.
- Collected data on various traits including biomass, yield components, and phenology.
- Analyzed genetic variation and correlations between traits.
Main Results:
- Significant genetic variation was observed for most traits, except productive tiller number (TN) and root-to-shoot ratio (RS).
- Root biomass positively correlated with grain yield under both water regimes.
- Kernels per spike (KPS) and total plant biomass (PB) showed the highest positive direct effects on grain yield.
Conclusions:
- Selection based on KPS and PB is more effective than RS for ideotype selection in segregating wheat populations.
- Increased root biomass allocation contributes to drought tolerance and carbon sequestration potential.
- Optimizing genotype selection for biomass traits can enhance wheat's resilience and soil health benefits.
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