New PCR based markers allowed to identify <Emphasis Type="Italic">Secale</Emphasis> chromatin in wheat-<Emphasis Type="Italic">Secale africanum</Emphasis> introgression lines |
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Authors: | Juqing Jia Guangrong Li Cheng Liu Jianping Zhou Zujun Yang |
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Institution: | School of Life Science and Technology,University of Electronic Science and Technology of China,Chengdu 610054,China |
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Abstract: | The genus of Secale has many agronomically important characters. In order to use the best of this species, markers tracking the rye chromatin
incorporated into wheat must be developed. In this study, one rye genome-specific random amplified polymorphic DNA (RAPD)
marker was isolated from Secale africanum (Ra genome). Two cloned markers, named OPP131165 and OPP13662, were 1165 bp and 662 bp, respectively. Sequence analysis revealed that OPP131165 was highly homologous to a part of a new class of transposon-like gene called the Revolver family, and OPP13662 was partially similar to LTR gypsy-like retrotransposon. Fluorescence in situ hybridization (FISH) showed only OPP131165 localized within the whole arms of rye except their terminal regions and no signal was detected on wheat chromosomes, while
OPP13662 had no hybridization signal detected on wheat and rye genomes. Based on these sequences, two pairs of sequence-characterized
amplified region (SCAR) primers were designed, and the resulted SCAR markers were able to target both cultivated and wild
Secale species. The FISH patterns and the two SCAR markers should be able to identify and track all wheat-rye translocation lines,
especially the S. africanum chromatin. |
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Keywords: | Secale africanum rye molecular marker fluorescence in situ hybridization(FISH) chromatin detection |
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