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GrainGenes Reference Report: TAG-104-473

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Reference	TAG-104-473
Title	Polymorphism at rDNA loci in barley and its relation with climatic variables
Journal	Theoretical and Applied Genetics
Year	2002
Volume	104
Pages	473-481
Author	Gupta PK [ Show all 7 ]
Abstract	Summary: The variation in length of the intergenic spacer (IGS) region of the ribosomal DNA repeat unit was examined in 63 accessions of wild barley, Hordeum spontaneum, and seven accessions of cultivated barley, Hordeum vulgare. The accessions of wild barley were collected from ecologically diverse climatic and edaphic microsites in Israel, and the barley cultivars were those grown in India. Sixteen spacer-length variants (slvs) observed in the present study presumably belonged to two known rDNA loci (Rrn1 and Rrn2). Each accession had one or more variants, which together represented the rDNA phenotype. The rDNA phenotypes of wild barley accessions were widely diverse and differed substantially from those of cultivated barley. The slv phenotypes and the corresponding alleles were shown to be largely correlated with different climatic, edaphic and ecogeographical microsites and niches (the 'Evolution Canyon' at Lower Nahal Oren, Mount Carmel; and Tabigha, Eastern Upper Galilee Mountains), so that a particular rDNA phenotype of an accession could be used to predict the climate and soil to which the accession belonged. This sharp microsite ecogeographic variation in ribosomal DNA appears adaptive in nature, and is presumably driven by climatic and edaphic natural selection
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/2104002/21040473.htm
Keyword	[ Hide all but 1 of 45 ] accessions adaptation allele alleles allozyme polymorphisms barley barley cultivars climate cultivar cultivated barley dna dna repeat unit ecogeographic ecogeographic variation evolution-canyon hordeum hordeum spontaneum hordeum vulgare india intergenic spacer israel loci microgeographic edaphic differentiation microsite mount-carmel natural selection phenotype polymorphism rdna rdna loci region repeat ribosomal dna ribosomal rna genes selection soil spacer spacer-length variants spontaneum triticum dicoccoides unit variant wild wild barley wild emmer wheat

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