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Novel Single-Nucleotide Variants for Morpho-Physiological Traits Involved in Enhancing Drought Stress Tolerance in
Ibrahim S Elbasyoni1,2, Shamseldeen Eltaher3, Sabah Morsy1
1Crop Science Department, Faculty of Agriculture, Damanhour University, Damanhour 22516, Egypt.
Plants (Basel, Switzerland)
|November 26, 2022
Summary
This study identified significant genetic markers in barley associated with yield and drought tolerance. These findings can help breed barley varieties that perform better under water-scarce conditions.
Area of Science:
- Agricultural Science
- Plant Genetics
- Molecular Biology
Background:
- Barley (Hordeum vulgare L.) is a vital crop in arid/semi-arid regions.
- Drought stress significantly reduces barley grain yield.
- Understanding genetic control of drought tolerance is crucial for crop improvement.
Purpose of the Study:
- To identify single nucleotide polymorphisms (SNPs) associated with agronomic traits in barley under deficit irrigation (DI) and full irrigation (FI).
- To discover novel genetic markers for enhancing barley performance under drought stress.
- To evaluate pleiotropic effects of identified markers on multiple traits.
Main Methods:
- Phenotypic evaluation of 426 barley lines for traits including flowering time, chlorophyll content, canopy temperature, grain filling duration, plant height, and grain yield.
- Genotyping using the 9K Infinium iSelect SNP platform.
- Genome-wide association scan (GWAS) using the BLINK method.
Main Results:
- 36 SNPs significantly associated with studied traits under DI and FI.
- Eight SNPs were common across both irrigation regimes, and 14 were unique to DI.
- Several SNPs exhibited pleiotropic effects, and 24 were annotated to known drought-response genes; 27 markers may be novel.
Conclusions:
- Identified significant SNPs and potential novel markers for barley breeding under drought stress.
- These markers can aid in predicting barley accessions with superior agronomic performance under varying water availability.
- The study provides valuable genetic resources for developing climate-resilient barley varieties.
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