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Open AccessArticle

Molecular Markers Associated with Agro-Physiological Traits under Terminal Drought Conditions in Bread Wheat

1
Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé 13, 2630 Taastrup, Denmark
2
Wheat Breeding Group, Plant Breeding and Genetics Division, Nuclear Institute for Agriculture and Biology, Faisalabad 38000, Pakistan
3
International Maize and Wheat Improvement Centre (CIMMYT) km, 45, Carretera Mex-Veracruz, El-Batan, Texcoco CP 56237, Mexico
4
International Potato Center, NASC Complex, Pusa, New Delhi 110012, India
5
Geneshifters, 222 Mary Jena Lane, Pullman, WA 99163, USA
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(9), 3156; https://doi.org/10.3390/ijms21093156
Received: 11 March 2020 / Revised: 19 April 2020 / Accepted: 28 April 2020 / Published: 30 April 2020
(This article belongs to the Special Issue Wheat Breeding through Genetic and Physical Mapping)
Terminal drought stress poses a big challenge to sustain wheat grain production in rain-fed environments. This study aimed to utilize the genetically diverse pre-breeding lines for identification of genomic regions associated with agro-physiological traits at terminal stage drought stress in wheat. A total of 339 pre-breeding lines panel derived from three-way crosses of ‘exotics × elite × elite’ lines were evaluated in field conditions at Obregon, Mexico for two years under well irrigated as well as drought stress environments. Drought stress was imposed at flowering by skipping the irrigations at pre and post anthesis stage. Results revealed that drought significantly reduced grain yield (Y), spike length (SL), number of grains spikes−1 (NGS) and thousand kernel weight (TKW), while kernel abortion (KA) was increased. Population structure analysis in this panel uncovered three sub-populations. Genome wide linkage disequilibrium (LD) decay was observed at 2.5 centimorgan (cM). The haplotypes-based genome wide association study (GWAS) identified significant associations of Y, SL, and TKW on three chromosomes; 4A (HB10.7), 2D (HB6.10) and 3B (HB8.12), respectively. Likewise, associations on chromosomes 6B (HB17.1) and 3A (HB7.11) were found for NGS while on chromosome 3A (HB7.12) for KA. The genomic analysis information generated in the study can be efficiently utilized to improve Y and/or related parameters under terminal stage drought stress through marker-assisted breeding. View Full-Text
Keywords: bread wheat; haplotype blocks; GWAS; grain yield; kernel abortion bread wheat; haplotype blocks; GWAS; grain yield; kernel abortion
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MDPI and ACS Style

Shokat, S.; Sehgal, D.; Vikram, P.; Liu, F.; Singh, S. Molecular Markers Associated with Agro-Physiological Traits under Terminal Drought Conditions in Bread Wheat. Int. J. Mol. Sci. 2020, 21, 3156. https://doi.org/10.3390/ijms21093156

AMA Style

Shokat S, Sehgal D, Vikram P, Liu F, Singh S. Molecular Markers Associated with Agro-Physiological Traits under Terminal Drought Conditions in Bread Wheat. International Journal of Molecular Sciences. 2020; 21(9):3156. https://doi.org/10.3390/ijms21093156

Chicago/Turabian Style

Shokat, Sajid; Sehgal, Deepmala; Vikram, Prashant; Liu, Fulai; Singh, Sukhwinder. 2020. "Molecular Markers Associated with Agro-Physiological Traits under Terminal Drought Conditions in Bread Wheat" Int. J. Mol. Sci. 21, no. 9: 3156. https://doi.org/10.3390/ijms21093156

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