Abstract
Malt barley (Hordeum vulgare L.) is an important cash crop with stringent grain quality standards. Timing of the switch from vegetative to reproductive growth and timing of whole-plant senescence and nutrient remobilization are critical for cereal grain yield and quality. Understanding the genetic variation in genes associated with these developmental traits can streamline genotypic selection of superior malt barley germplasm. Here, we determined the effects of allelic variation in three genes encoding a glycine-rich RNA-binding protein (HvGR-RBP1) and two NAC transcription factors (HvNAM1 and HvNAM2) on malt barley agronomics and quality using previously developed markers for HvGR-RBP1 and HvNAM1 and a novel marker for HvNAM2. Based on a single-nucleotide polymorphism (SNP) in the first intron, the utilized marker differentiates NAM2 alleles of low-grain protein variety ‘Karl’ and of higher protein variety ‘Lewis’. We demonstrate that the selection of favorable alleles for each gene impacts heading date, senescence timing, grain size, grain protein concentration, and malt quality. Specifically, combining ‘Karl’ alleles for the two NAC genes with the ‘Lewis’ HvGR-RBP1 allele extends grain fill duration, increases the percentage of plump kernels, decreases grain protein, and provides malt quality stability. Molecular markers for these genes are therefore highly useful tools in malt barley breeding.
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Data availability
HvNAM2 sequences from varieties ‘Karl’ and ‘Lewis’ are shown in Online Resource 6. Genoty** data for HvGR-RBP1, HvNAM1, and HvNAM2 are shown in Online Resource 1; agronomic and malt quality data for experiment 1 (Pauli et al. 2015) are shown in Online Resources 2 and 4, and agronomic data for experiment 2 (Alptekin et al. 2021) are shown in Online Resource 3.
Code availability
No new code was generated as a part of this study.
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Acknowledgements
The authors would like to thank Christopher Martens for malt phenoty**.
Funding
This project was supported by funding from the Montana Agricultural Experiment Station (MAES), the Montana Wheat and Barley Committee, the Brewers Association, the American Malting Barley Association, and the United States of Agriculture—National Institute of Food and Agriculture (USDA-NIFA) (2017–68008-26209).
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BA contributed to HvNAM2 sequencing and marker development, performed HvNAM1 and HvGR-RBP1 genoty**, performed all statistical analyses (guided and supported by JL), and wrote a draft manuscript. ME contributed to HvNAM2 sequencing, developed the VNTR marker, and performed HvNAM2 genoty**. DM performed experiment 2 field studies, supported by JS’s breeding program. DP and TB shared field data for experiment 1. HT helped with malt phenoty**. AMF and JS obtained funding and directed the study. All authors have reviewed and approved the manuscript, as submitted to Molecular Breeding.
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Alptekin, B., Erfatpour, M., Mangel, D. et al. Selection of favorable alleles of genes controlling flowering and senescence improves malt barley quality. Mol Breeding 42, 59 (2022). https://doi.org/10.1007/s11032-022-01331-7
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DOI: https://doi.org/10.1007/s11032-022-01331-7