摘要
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 OPP13_(1165) and OPP13_(662),were 1165 bp and 662 bp,respectively.Sequence analysis revealed that OPP13_(1165) was highly homologous to a part of a new class of transposon-like gene called the Revolver family,and OPP13_(662) was partially similar to LTR gypsy-like retrotransposon.Fluorescence in situ hybridization(FISH)showed only OPP13_(1165) localized within the whole arms of rye except their terminal regions and no signal was detected on wheat chromosomes,while OPP13_(662) 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.
基金
We thank the National Natural Science Foundation of China(Grant No.30671288,30871518)
Program for New Century Excellent Talents in Universities(No.NCET-06-0810)
Young Scholars Foundation from the Science and Technology Committee of Sichuan Province(No.2008-31-371)for financial support.
