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The 5S rRNA gene diversity in Kengyilia rigidula (Keng and S.L. Chen) J.L. Yang, Yen, and Baum (Poaceae: Triticeae): possible contribution of the H genome to the origin of Kengyilia

The 5S rRNA gene diversity in Kengyilia rigidula (Keng and S.L. Chen) J.L. Yang, Yen, and Baum (Poaceae: Triticeae): possible contribution of the H genome to the origin of Kengyilia

Genome 43(1): 79-85

ISSN/ISBN: 0831-2796

PMID: 10701116

DOI: 10.1139/g99-101

Fifty-three units of 5S rDNA sequences from five accessions of Kengyilia rigidula, a member of the tribe Triticeae that also includes wheat, barley, rye, and their wild relatives, have been amplified by the polymerase chain reaction (PCR), cloned, and sequenced. The genome of K. rigidula consists of three haplomes, St, P, and Y. An evaluation of the aligned sequences of the diverse 53 different 5S DNA units yielded three 5S-unit classes. One unit class, Long S1, was assignable to the St haplome, one unit class, the Long P1, was assignable to the P haplome, and a third unit class, Long H1, was assignable to the H haplome. The last was expected to be assignable to the Y haplome, based on previous knowledge. Evolutionary scenarios are put forward to explain this finding. Among those possibilities is that the number of copies of units assignable to the Y haplome is very small and difficult to detect. Short units, reported earlier in K. alatavica, were not found in K. rigidula.

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Accession: 003578559

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