Estimates of Heritability and Genetic Correlation for Five Traits in Female Hop Accessions

Henning, Jimmy C.; Haunold, Alfred; Nickerson, Gail B.; Gampert, U.

doi:10.1094/asbcj-55-0161

Cited by 10 publications

(16 citation statements)

References 7 publications

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“…While the heritability estimates reported in this study are possibly underestimates, the findings from this study may be more broadly applicable to hop as a species, as estimates were based on a larger number and greater diversity of families than any previous study [24,26,31] (Additional file 2a). Studies which have examined the genetic diversity of hop have determined two primary genetic groupings: European and North American [53-61].…”

Section: Discussionmentioning

confidence: 81%

“…The relationships between α-acid and β-acid reported in previous studies vary. Negative genetic correlations between the two compounds were reported by Henning et al [25,26], but positive genetic correlations were reported by Henning and Townsend [24] (Additional file 2b). Murakami [31] examined the genetic relationships between α-acid, β-acid and α-acid:β-acid, but did not find a significant correlation between any of the traits.…”

Section: Discussionmentioning

confidence: 88%

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Quantitative genetic parameters for yield, plant growth and cone chemical traits in hop (Humulus lupulus L.)

et al. 2014

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BackgroundMost traits targeted in the genetic improvement of hop are quantitative in nature. Improvement based on selection of these traits requires a comprehensive understanding of their inheritance. This study estimated quantitative genetic parameters for 20 traits related to three key objectives for the genetic improvement of hop: cone chemistry, cone yield and agronomic characteristics.ResultsSignificant heritable genetic variation was identified for α-acid and β-acid, as well as their components and relative proportions. Estimates of narrow-sense heritability for these traits (h 2 = 0.15 to 0.29) were lower than those reported in previous hop studies, but were based on a broader suite of families (108 from European, North American and hybrid origins). Narrow-sense heritabilities are reported for hop growth traits for the first time (h 2 = 0.04 to 0.20), relating to important agronomic characteristics such as emergence, height and lateral morphology. Cone chemistry and growth traits were significantly genetically correlated, such that families with more vigorous vegetative growth were associated with lower α-acid and β-acid levels. This trend may reflect the underlying population structure of founder genotypes (European and North American origins) as well as past selection in the Australian environment. Although male and female hop plants are thought to be indistinguishable until flowering, sex was found to influence variation in many growth traits, with male and female plants displaying differences in vegetative morphology from emergence to cone maturity.ConclusionsThis study reveals important insights into the genetic control of quantitative hop traits. The information gained will provide hop breeders with a greater understanding of the additive genetic factors which affect selection of cone chemistry, yield and agronomic characteristics in hop, aiding in the future development of improved cultivars.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 88%

Quantitative genetic parameters for yield, plant growth and cone chemical traits in hop (Humulus lupulus L.)

et al. 2014

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“…They also reported negative genetic correlations between α‐acid and β‐acid content, and between β‐acid and hop storage index, and positive genetic correlations between cohumulone and yield, and cohumulone and hop storage index. Genetic variation in hop has also been reported for essential oil concentration (Henning et al, 1997b) and mineral concentration (Keller and Likens, 1955).…”

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confidence: 94%

Potential Heterotic Groups in Hop as Determined by AFLP Analysis

Townsend

Henning

2005

Crop Science

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␤-acid was negatively correlated among 112 female (r ϭ Ϫ0.78), and among 74 male hop genotypes (r ϭ Ϫ0.85). Hop (Humulus lupulus L.) is a perennial, dioecious species inAdditive genetic variation was detected for yield, ␣and which the female inflorescence (cones) are harvested and used in the beer-brewing process to impart bittering and/or flavoring to beer.␤-acid content, cohumulone, and hop storage index for Hop breeders have typically utilized clonal selection and hybridization both males and females in a North Carolin Design I to develop new cultivars. The use of genetically diverse parents for analysis of 25 yr of USDA historical data (Henning et al., the purpose of capturing heterosis in the offspring has received little 1997a). They also reported negative genetic correlations attention from hop breeders. The objective of this research was to between ␣-acid and ␤-acid content, and between ␤-acid assign male (N ϭ 80) and female (N ϭ 26) hop genotypes into potential and hop storage index, and positive genetic correlations heterotic groups using AFLP-generated molecular markers. The six between cohumulone and yield, and cohumulone and AFLP primers used in this study amplified 550 total fragments, of which 490 (89.1%) were polymorphic. A genetic distance (GD) matrix hop storage index. Genetic variation in hop has also was computed from the binary data matrix, and groupings and sumbeen reported for essential oil concentration (Henning mary statistics were calculated from the GD matrix. Two major cluset al., 1997b) and mineral concentration (Keller and ters were observed, one composed primarily of European hops, while Likens, 1955). the second group was composed primarily of European-wild Ameri-Several molecular marker tools have been employed can hybrids. The two major clusters were further subdivided into 13 to assess genetic diversity in hop, including amplified smaller clusters (two female, nine male, two male and female) based fragment length polymorphsim (AFLP) (Hartl and Seeon a qualitative analysis. These results suggest potential parental combinations for hop researchers and breeders to study heterosis in hop.

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“…Two additional clones of the cultivar Early Prolific, grown on different plots, were included as controls. All data were standardized to a moisture content of 80 g kg −1 Hop cone yield, bittering acids (α‐ and β‐acid content), CoH, and HSI were reported as published by Henning et al (1997) Levels of M, C, and H were reported as percentages of the total essential oil extract. All data were averaged across years and only entries with at least three replicate year's data were included.…”

Section: Methodsmentioning

confidence: 99%

Genetic Diversity among World Hop Accessions Grown in the USA

2004

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Hop (Humulus lupulus L.) is an important cash crop in the U.S. Pacific Northwest. Classifying groups of hop accessions presently held in the USDA‐ARS world collection is vital toward categorizing newly imported accessions and identifying closely related (if not identical) cultivars. The objective of this study was to identify hop germplasm diversity pools on the basis on morphological and chemical data by cluster analysis. Eight hop quality characteristics including yield (YLD), α acids, β acids, hop‐storage index (HSI), cohumulone (CoH), myrcene (M), caryophyllene (C), and humulene (H) were obtained from historical databases for 129 accessions from the USDA‐ARS hop germplasm field collection located near Corvallis, OR. Three distinct genetic diversity pools were identified and named: (i) European, (ii) Wild North American, and (iii) Hybrids. The European pool was divided into English and Continental European subgroups distinguished by their α‐acids and CoH contents. The Hybrid pool was divided into five subgroups distinguished by their geographic origins. The variables YLD and CoH content differentiated these five subgroups (r = 0.92; P ≤ 0.05). The information presented in our study will help categorize newly imported accessions into the current U.S. hop germplasm collection and will help in identifying closely related or similar accessions.

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Estimates of Heritability and Genetic Correlation for Five Traits in Female Hop Accessions

Cited by 10 publications

References 7 publications

Quantitative genetic parameters for yield, plant growth and cone chemical traits in hop (Humulus lupulus L.)

Quantitative genetic parameters for yield, plant growth and cone chemical traits in hop (Humulus lupulus L.)

Potential Heterotic Groups in Hop as Determined by AFLP Analysis

Genetic Diversity among World Hop Accessions Grown in the USA

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