Comparative Mapping of Genes for Brittle Rachis in Triticum
N. Watanabe, N. Takesada, Y. Fujii, P. Martinek
https://doi.org/10.17221/3671-CJGPBCitation:Watanabe N., Takesada N., Fujii Y., Martinek P. (2005): Comparative Mapping of Genes for Brittle Rachis in Triticum. Czech J. Genet. Plant Breed., 41: 39-44.Xgwm72 (14.2 cM). Br1 was located on chromosome 3DS. The distance from the centromeric marker Xgdm72 was 23.6 cM. The loci Br1, Br2 and Br3 determine disarticulation of rachides above the junction of the rachilla with the rachis so that a fragment of rachis is attached below each spikelet. The rachides of Ae. tauschii are brittle at every joint, so that the mature spike disarticulates into barrel type. The brittle rachis was determined by a dominant gene, Brt, which was linked to the centromeric marker, Xgdm72 (19.7 cM), on chromosome 3DS. A D-genome introgression line, R-61, was derived from the cross Bet Hashita/Ae. tauschii, whose rachis disarticulated as a wedge type. The gene for brittle rachis of R-61, tentatively designated as Br61, was distally located on chromosome 3DS, and was linked with the centromeric marker, Xgdm72 (27.5 cM). We discussed how the brittle rachis of R-61 originated genetically.
brittle rachis; homoeologous genes; mapping; Triticum; Aegilops
Impact factor (Web of Science):
2019: 0.8
Q4 – Agronomy
Q4 – Plant Sciences
5-Year Impact Factor: 0.859
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