LOM et al JXB_PHENO_GENO-2

Genotypic and phenotypic data for the HEB-25 barley mapping population grown under well-watered (WW) and water-limited (WL) environments for two years (2015 and 2016). The genotypic data: 11, homozygous for the cultivated Hordeum vulgare allele; 12, heterozygous; 22, homozygous for the wild donor (H. spontaneum). Phenotype: Heading time (HEA), defined as the time between sowing to time at which the first spike of 50% of the plants in a plot reaches BBCH49 (first awns visible), was recorded based on daily inspection. Days from sowing to stage BBCH87 (hard dough: grain content solid: fingernail impression held) was recorded as maturity (MAT). At maturity, plant height (HEI) was measured from the soil surface to the base of the three first spikes per plot.
At full grain maturity and after plants were fully dried, all aboveground biomass was harvested and weighed to determine total dry matter (TDM). Notably, all the free-thrashing material (app. ¼ of the material) was caged between BBCH49 and BBCH87 to avoid loss of spikes. Spikes were then threshed and weighed to determine plant grain yield (PGY). Finally, grains were counted to estimate grain number per mini-plot (GN) and average grain weight (GW). Harvest index (HI) was calculated as the ratio between PGY and TDM. Vegetative dry matter (VDW) was calculated by subtracting PGY from TDM. The grain-filling period (GFP) was calculated by subtracting HEA from MAT. Trait values were adjusted based on the ratio between population mean values in the two years. The adjusted HEB means across years were used in the GWAS.