Abstract
To better understand the genetic diversity of the wild relatives of rice (Oryza sativa L.) in the O. officinalis species complex repetitive DNA markers were obtained from the diploid species of this complex. One cloned sequence from O. eichingeri gave intense hybridization signals with all species of the O. officinalis complex. This 242 bp clone, named pOe.49, has a copy number from 0.9 to 4.0 × 104 in diploid species of this complex. Analysis of the primary structure and database searches revealed homology of pOe.49 to a number of sequences representing part of the integrase coding domain of retroviruses and gypsy-like retrotransposons. Sequencing of specific PCR products confirmed that pOe.49 is part of a gypsy-like retrotransposon. RFLP analysis was used to study the genomic organisation of pOe.49 among 30 accessions of the O. officinalis complex using 10 restriction enzymes. Diversity analysis based on 120 polymorphic fragments obtained from the RFLP assay grouped the O. officinalis complex accessions by genome, species and eco-geographic groups. The results suggest that, with further characterization, this retrotransposon-like DNA sequence may be useful for phylogenetic analysis of species in the O. officinalis complex.
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Shcherban, A.B., Vaughan, D.A. & Tomooka, N. Isolation of a new retrotransposon-like DNA sequence and its use in analysis of diversity within the Oryza officinalis. Genetica 108, 145–154 (2000). https://doi.org/10.1023/A:1004165903202
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DOI: https://doi.org/10.1023/A:1004165903202