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Structure and inheritance of ribosomal DNA variants in cultivated and wild hop, Humulus lupulus L.

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Abstract

Genetic variation was assessed among cultivated and wild hop, Humulus lupulus, by restriction fragment length polymorphisms (RFLPs) of the ribosomal RNA genes (rDNA). Two rDNA length variants of 10.3 and 9.3 kbp represented by three phenotypes designated A, B and C were detected with XhoI. Restriction-site mapping showed that hop rDNA is structurally similar to those of most higher plants. A high level of homogeneity existed in rDNA repeat lengths among the diverse hop genotypes. Generally, phenotype A was predominant in wild and cultivated European and Asian genotypes; phenotype B in North American cultivars; while phenotype C was present only in native North American hop, providing a potential molecular marker for the identification of this germ plasm. The rDNA data provided genetic evidence for the separation of native and cultivated American genotypes and supports the hypothesis that North American hop cultivars are of hybrid origin from European and native American genotypes. The segregation of rDNA phenotypes in four F1 families suggests that a single locus with two co-dominant alleles controls genetic variability for rDNA variants in hop.

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  1. M. Pillay

    Present address: Department of Plant and Soil Science, Alabama A & M University, P. O. Box 1208, 35762, Normal, AL, USA

Authors and Affiliations

  1. Department of Crop and Soil Sciences, Irrigated Agriculture Research and Extension Center, Washington State University, 99350, Prosser, WA, USA

    M. Pillay & S. T. Kenny

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  2. S. T. Kenny
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Communicated by H.F. Linskens

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Pillay, M., Kenny, S.T. Structure and inheritance of ribosomal DNA variants in cultivated and wild hop, Humulus lupulus L.. Theoret. Appl. Genetics 93, 333–340 (1996). https://doi.org/10.1007/BF00223173

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  • DOI: https://doi.org/10.1007/BF00223173

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