Identification of stable QTLs and candidate genes associated with plant height and spike length in common wheat
Somayeh Sardouei-Nasab
A * , Ghasem Mohammadi-Nejad A * and Babak Nakhoda B
A
B
Handling Editor: Enrico Francia
Abstract
Plant height and spike length are important traits with significant impact on the potential yield of wheat. It is essential to dissect their genetic control in order to improve yield potential through breeding.
We aimed to identify genomic regions with stable and major-effect quantitative trail loci (QTLs) associated with plant height and spike length in common wheat (Triticum aestivum L.).
Three recombinant inbred line (RIL) mapping populations were created by crossing a common parental line, Roshan, with three different cultivars: Sabalan, Falat, and Superhead. The RILs were grown over 3 years at five locations under water-stressed and well-watered conditions. Plant height and spike length were measured during each experiment, and inclusive composite interval mapping was used to analyse the data in both single-and multi-environment analyses.
Single-environment analysis detected 32 additive QTLs in the three populations. Three novel, stable and non-epistatic QTLs were identified: qPH1D for plant height in the Sabalan background; and qSL1D and qSL1B.3 for spike length in the Falat and Superhead backgrounds, respectively. Between the flanking markers on chromosomes 1B, 1D and 4B, 191 genes were predicted, 20 of which were identified as potential candidates with roles in wheat plant height and spike-related traits.
The study identified stable QTLs for plant height and spike length in wheat, providing valuable markers for future breeding programs and enhancing yield potential.
These results lay a good foundation for fine mapping of QTLs/genes for molecular marker-assisted breeding in wheat in the future.
Keywords: bread wheat, candidate genes, DArT marker, epistatic QTL, genetic background effects, multi-environments, plant height, QTL mapping, spike length.
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