COMPARISON OF HILL AND ROW PLOTS FOR AGRONOMIC AND QUALITY TRAITS IN SPRING MALTING BARLEY (Hordeum vulgare L.)

Abstract

Provided they reliably predict row plot performance, hill plots should be useful for doubled haploid recurrent selection in malting barley (Hordeum vulgare L.). The primary objective of this research was to compare hill and row plot expression of agronomic and malting quality traits in an array of elite spring habit barley germplasm grown under irrigated conditions. A supporting objective was to identify an appropriate seeding rate for hill plot evaluation. Eight-replicate hill plots at four seeding rates (10, 20, 30, and 40 seeds per hill) were compared with adjacent four-replicate row plots in each of three environments. Genotype and genotype × environment interactions were significant for most agronomic traits in both plot types. Significant, linear genotype responses to hill plot seeding rates were observed for most agronomic traits. Seeding rate had no consistent effect on the expression of malting quality. The percentage of lines in common in the two plot types at 25 and 50% selection intensities was the most useful comparison statistic and indicated hill plot selection should be effective for most agronomic and malting quality traits. Although yield heritability estimates were consistently high in both hill and row plots, there was little relationship between trait expression in the two plot types. Differential tillering in response to hill plot competition is likely responsible. A seeding rate of 10 seeds per hill should be appropriate in preliminary screening for traits amenable to hill plot selection in irrigated spring habit malting barley.Key words: Hordeum vulgare L., malting quality, breeding methods, barley

Application of quantitative trait locus mapping to the development of winter‐habit malting barley*

“…The prefixes m, i, and ap designate morphological, isozyme, and Sequence Tagged Site (STS) markers, respectively. Additional detail on the STS markers can be found in Tragoonrung et al (1992). Restriction fragment length polymorphisms (RFLPs) were detected with an array of anonymous cDNA and genomic clones and several known function clones.…”

“…Isozyme and storage protein markers were analysed as described by Nielsen and Johanson (1986). STS markers were assayed as described by Tragoonrung et al (1992) and RFLP markers were assayed as described by Kleinhofs etal. (1993).…”

“…The use of a single replication was also justified on the grounds that the primary determinant of the power of hypothesis tests regarding QTL genotype means is the number of replications of QTL genotypes, not the number of times each line is replicated (Knapp et al 1990). Malt-quality analyses were performed on 400-g samples from both the autumn-and spring-seeded experiments by the USDA-ARS Cereal Crop Research Unit as described by Tragoonrung et al (1990).…”

Near-Infrared Reflectance Estimates of Grain Protein and Malt Extract in Hill and Row Plot Evaluations of Spring Malting Barley

“…1971), lysine conrent (Gill er al. 1979), B-glucan content (Greenberg 1974) and malt extract (Morgan 1979;McGuire 1982 (Frey et al 1988 (Tragoonrung et al 1990 For personal use only. Williams (1975 For personal use only.…”

Effects of selection and opportunities for recombination in doubled‐haploid populations of barley (Hordeum vulgare L.)

“…Finally, there is the issue of trait expression in hill versus row plots. There is a general consensus that hill-plot phenotypes are reliable predictors of row-plot performance for heading date, plant height, and yield components (Tragoonrung et al 1990), but the utihty of hill plots for grain yield selection is still debatable (Pfeiffer andPilcher 1989, St.-Martin et al 1990). In a companion paper (Iyamabo and Hayes 1995), it is reported that hill plots are nearly as effective as row plots in detecting QTLs for plant height, heading date, and 1000-kernel weight, but not as effective in detecting yield QTLs.…”