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Molecular cytogenetic characterization of natural hybrids of Roegneria stricta and Roegneria turczaninovii (Triticeae: Poaceae)
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  • Chen Chen,
  • Lue Zheng,
  • Dan Wu,
  • Lu Tan,
  • Rong Yang,
  • Qing Liu,
  • Le Lu,
  • Xing Fan,
  • Lina Sha,
  • Houyang Kang,
  • Yi Wang,
  • Hong Zhou,
  • Bing Zhang,
  • Haiqin Zhang
Chen Chen
Triticeae Research Institute
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Lue Zheng
Triticeae Research Institute
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Dan Wu
Triticeae Research Institute
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Lu Tan
Triticeae Research Institute
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Rong Yang
College of Chemistry and Life Sciences
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Qing Liu
College of Chemistry and Life Sciences
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Le Lu
College of Grassland Science and Technology
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Xing Fan
Triticeae Research Institute
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Lina Sha
College of Grassland Science and Technology
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Houyang Kang
Triticeae Research Institute
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Yi Wang
Triticeae Research Institute
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Hong Zhou
Triticeae Research Institute
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Bing Zhang
Sichuan Academy of Grassland Science
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Haiqin Zhang
College of Grassland Science and Technology
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Abstract

Hybridization is an important part of species evolution. The hybrid progeny population had rich genetic and phenotypic variation, which made the boundaries between them and their parents blurred and difficult to distinguish. There was little research on the origin of natural hybrids of Triticeae. In this study, we found a large number of putative hybrids of Roegneria in West Sichuan Plateau, China. The hybrid plants showed strong heterosis in plant height, tiller number and floret number. Morphologically, the putative hybrids showed intermediate of Roegneria stricta Keng and Roegneria turczaninovii (Drob.) Nevski. Hybrids had 28 chromosomes corresponding to that of R. stricta and R. turczaninovii (2n=4x=28). Meiotic pairing in hybrids were less regular than those of R. stricta and R. turczaninovii. GISH analysis showed that the hybrid plants had the same genome as that of R. stricta and R. turczaninovii (StY). Phylogenetic analysis based on the single copy nuclear gene DMC1 and chloroplast gene rps16 showed the plants were closely related to R. stricta and R. turczaninovii. This study indicated that the plants were hybrids of R. stricta and R. turczaninovii. The results provided data for the utilization of hybrid. This study provided a case study of natural hybrids.

Peer review status:UNDER REVIEW

27 Apr 2021Submitted to Ecology and Evolution
07 May 2021Assigned to Editor
07 May 2021Submission Checks Completed
11 May 2021Reviewer(s) Assigned