Morphological Complexes in Hops (Humulus lupulus L.) with Special Reference to the American Race

Davis, Edward L.

doi:10.2307/2394646

Cited by 11 publications

(5 citation statements)

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“…Cone shape is one of the most important quality traits in hop breeding (Wormald 1915, Schmidt 1917, Salmon and Wormald 1921, Blattny 1950, Davis 1957, Ono 1961, Wagner 1974, 1975, Rybáček 1980, Kišgeci et al 1984, Schattenhofer 1989, Barth et al 1994, Henning et al 1997, Moir 2000, Rígr and Faberová 2000 Hampton et al 2001, Hampton et al 2002, Srečec 2004, Nesvadba 2007.…”

Section: Resultsmentioning

confidence: 99%

“…In the past century, investigations concerning wild hops became more intensive (Wormald 1915, Schmidt 1917, Salmon and Wormald 1921, Blattny 1950, Davis 1957. However, the most important studies of wild hops related to this paper were provided by Wagner (1974Wagner ( , 1975 who described 398 hop habitats in Pannonian, Alpine, Dinaric, PindoRhodopian, Carphato-Balkanian and Mediterranean macro-regions of former Yugoslavia.…”

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confidence: 99%

“…Studying of hop wild gene pool is of essential need for sustainability of hop production (Nesvadba 2007). Cytogenetic and molecular studies of wild hops have brighten up the phylogeny of hops (Ono 1961, Henning et al 1997, Hampton et al 2001, Hampton et al 2002, Jakše et al 2004, Murakami et al 2006, Lutz et al 2007, Nesvadba 2007, Probasco et al 2007, but a few authors reported on phenotypic variability of wild hop populations (Wormald 1915, Schmidt 1917, Salmon and Wormald 1921, Blattny 1950, Davis 1957, Ono 1961, Wagner 1974and 1975, Nesvadba 2007. However, phenotypic characterization of hop plants is the very first step that precedes the mentioned molecular analyses.…”

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confidence: 99%

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Phenotypic and alpha-acid content diversity of wild hop populations in Croatia

Srečec¹,

Zechner-Krpan²,

Petravić-Tominac³

et al. 2010

PLANT SOIL ENVIRON

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An ecogeographical survey of wild hop populations was conducted in the northwest of Croatia in two consecutive years. A total of 121 plants was documented on eight locations. Along with the passport data, the data on three phenotypic traits (no. of leaflets, cone shape, aroma) were gathered during collection, while the content of α-acids in hop cones was determined by lead conductance. Shannon's information index was calculated for each phenotypic trait and was used as a measure of intra-and inter-population diversity. For all analyzed traits, most of the total phenotypic diversity was attributable to differences among plants within populations. The differences in proportions of individuals having a particular trait state between all pairs of populations in the case of leaflet number and cone shapes were non-significant. Four out of 28 pairwise comparisons for aroma were proven significant, indicating the existence of differences in proportions of individuals across populations recorded to have 'typical hoppy' , 'fine hop' or 'rough' aroma. No significant differences were observed for α-acids content among populations. Plants exhibiting elongated cone shape had significantly higher α-acids content than those having oval or round cone shapes. Similarly, plants categorized as 'rough' aroma hop cones had the highest content of α-acids compared with those categorized as 'typical hoppy' or 'fine hop aroma' hop cones.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Phenotypic and alpha-acid content diversity of wild hop populations in Croatia

Srečec¹,

Zechner-Krpan²,

Petravić-Tominac³

et al. 2010

PLANT SOIL ENVIRON

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“…The concepts of DAVIS (1957) and SMALL (1978) strongly suggest that natural Humulus world variants, while distinguishable by numerical analysis (SMALL 1980), fit readily into a single species, H. lupulus. Referring to supposed distinc-360 HAMPTON tion between native European and American plants, DAVIS suggested, "it is preferable to use the name Humuius lupulus for all wild perennial hops".…”

Section: Discussionmentioning

confidence: 99%

Health Status (Virus) of Native North American Humulus lupulus in the Natural Habitat

Hampton

1988

Journal of Phytopathology

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Ninety‐one native North American Humulus lupulus plants from natural habitats in seven western and mid‐western states of the U.S.A. were tested by ELISA serology for presence of two ilarviruses and three carlaviruses common to cultivated hops. All plants in natural habitats were free of detectable viruses. Propagations of 14 such plants from earlier collections had become infected, particularly with two carlaviruses (hop latent virus, American hop latent virus) after exposure for 22 years tobreeding nurseries. ELISA tests of some 284 hop plants primarily from breeding nurseries in Oregon indicated the following infection rates: Prunus necrotic ringspot virus, 85/284, 30%; apple mosaic virus, 88/234, 38%; hop mosaic virus, 59/158, 37 %; hoplatent virus, 104/158, 66 %; and American hop latent virus, 79/158, 50 %. Inoculum reservoirs of AHLV were sought among 53 principally perennial non‐Humulus plant species surrounding AHLV‐infected hop yards and nurseries. AHLV was neither indigenous to native North American H. lupulus nor detectable in these selected non‐Humulus plant species. Breeding nurseries and commercial hop yards, thus, were the only detectable inoculum reservoir for AHLV.

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“…Many systems of hop identification, based on botanical description, have been established. These range from methods which rely mainly on general descriptive terms-such as size, shape, maturity, and quality (14,15)-to highly technical systems utilizing measurement of strig angularity, types of glandular hairs, and the like (4). In all cases, within-plant and among-plant variation is substantial, a factor which frequently leads to overlapping of varietal traits.…”

mentioning

confidence: 99%

Identification of hop varieties by gas chromatographic analysis of their essential oils. Constancy of oil composition under various environmental influences

Likens¹,

Nickerson²

1967

J. Agric. Food Chem.

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The essential oil of several varieties of hops displayed good varietal uniformity of composition under the following environmental conditions: annual climatic conditions, climates and soils of widely different growing areas within the United States, abnormal ranges of nitrogen and phosphorus fertility over various moisture levels, development of the plant over a 4-year period (hops are perennial), maturity of the crop over a 21-day harvest period, while hosting any of several viruses, through processing, and during storage. These observations were offered as justification for accepting hop oil composition as a reliable criterion for a system of varietal identification.

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Morphological Complexes in Hops (Humulus lupulus L.) with Special Reference to the American Race

Cited by 11 publications

References 10 publications

Phenotypic and alpha-acid content diversity of wild hop populations in Croatia

Phenotypic and alpha-acid content diversity of wild hop populations in Croatia

Health Status (Virus) of Native North American Humulus lupulus in the Natural Habitat

Identification of hop varieties by gas chromatographic analysis of their essential oils. Constancy of oil composition under various environmental influences

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