Spontaneous and divergent hexaploid triticales derived from common wheat × rye by complete elimination of D-genome chromosomes

PloS One
Hao LiWanquan Ji

Abstract

Hexaploid triticale could be either synthesized by crossing tetraploid wheat with rye, or developed by crossing hexaploid wheat with a hexaploid triticale or an octoploid triticale. Here two hexaploid triticales with great morphologic divergence derived from common wheat cultivar M8003 (Triticum aestivum L.) × Austrian rye (Secale cereale L.) were reported, exhibiting high resistance for powdery mildew and stripe rust and potential for wheat improvement. Sequential fluorescence in situ hybridization (FISH) and genomic in situ hybridization (GISH) karyotyping revealed that D-genome chromosomes were completely eliminated and the whole A-genome, B-genome and R-genome chromosomes were retained in both lines. Furthermore, plentiful alterations of wheat chromosomes including 5A and 7B were detected in both triticales and additionally altered 5B, 7A chromosome and restructured chromosome 2A was assayed in N9116H and N9116M, respectively, even after selfing for several decades. Besides, meiotic asynchrony was displayed and a variety of storage protein variations were assayed, especially in the HMW/LMW-GS region and secalins region in both triticales. This study confirms that whole D-genome chromosomes could be preferentially eliminated...Continue Reading

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Citations

Mar 30, 2016·Genome Génome / Conseil National De Recherches Canada·Wujuan YangWanquan Ji
Dec 28, 2019·Comparative Cytogenetics·Elena V EvtushenkoAlexander V Vershinin

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