Drought Tolerance Evaluation and Classification of Foxtail Millet Core Germplasms Using Comprehensive Tolerance Indices
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View abstract on PubMed
Summary
This summary is machine-generated.Developing drought-tolerant foxtail millet is crucial for food security. This study identified key traits and elite germplasms, like T125 and Baogu 23, for climate-resilient crop development in arid regions.
Area Of Science
- Agricultural Science
- Plant Breeding
- Climate Resilience
Background
- Drought stress severely limits crop yields in arid and semi-arid regions, threatening food security.
- Developing drought-tolerant crop varieties is essential for sustainable agriculture in water-scarce environments.
- Foxtail millet (Setaria italica) is a vital grain crop in many dryland farming systems.
Purpose Of The Study
- To evaluate drought tolerance in 222 foxtail millet germplasms under controlled drought conditions.
- To identify key morpho-agronomic traits and develop a predictive model for drought tolerance screening.
- To classify germplasms based on their resistance levels and identify elite drought-tolerant varieties.
Main Methods
- Field experiments comparing normal irrigation with drought stress (1800 m³/ha) across 12 traits.
- Statistical analyses including Principal Component Analysis (PCA), correlation, and stepwise regression.
- Integrated evaluation using drought tolerance coefficient (DTC), drought resistance index (DRI), and D-values for germplasm classification.
Main Results
- Drought stress significantly reduced all measured morpho-agronomic traits, with yield being the most sensitive (DTC=0.58).
- PCA revealed yield components as major contributors to genotypic variation.
- Five critical traits (stem basal thickness, biomass, spike weight, grain weight per spike, yield) were identified for efficient screening.
- Elite germplasms T125 and Baogu 23 demonstrated superior drought tolerance across evaluation methods.
- Germplasm classification revealed 4.50% highly resistant, 11.71% resistant, 57.21% moderately resistant, 16.22% sensitive, and 10.36% highly sensitive.
Conclusions
- A robust methodological framework for evaluating foxtail millet drought tolerance was established.
- Identified traits and a predictive model enable efficient selection of climate-resilient cultivars.
- Elite germplasms T125 and Baogu 23 serve as valuable resources for breeding programs.
- Findings support agricultural sustainability and food security in water-limited environments facing climate change impacts.
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