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ARS Home » Pacific West Area » Logan, Utah » Forage and Range Research » Research » Publications at this Location » Publication #380333
Research Project: Improved Plant Genetic Resources and Methodologies for Rangelands, Pastures, and Turf Landscapes in the Semiarid Western U.S.

Location: Forage and Range Research

Title: Genome evolution during bread wheat formation unveiled by the distribution dynamics of SSR sequences on chromosomes using FISH

Author
item ZHANG, YINGXIN - Chinese Academy Of Sciences
item FAN, CHENGMING - Chinese Academy Of Sciences
item CHEN, YUHONG - Chinese Academy Of Sciences
item Wang, Richard
item ZHANG, XIANGQI - Chinese Academy Of Sciences
item HAN, FANGPU - Chinese Academy Of Sciences
item HU, ZANMIN - Chinese Academy Of Sciences

Submitted to: BMC Genomics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/30/2020
Publication Date: 1/14/2021
Citation: Zhang, Y., Fan, C., Chen, Y., Wang, R., Zhang, X., Han, F., Hu, Z. 2021. Genome evolution during bread wheat formation unveiled by the distribution dynamics of SSR sequences on chromosomes using FISH. BMC Genomics. 22. Article 55. https://doi.org/10.1186/s12864-020-07364-6.
DOI: https://doi.org/10.1186/s12864-020-07364-6

Interpretive Summary: Bread wheat is an important cereal crop supplying food energy for mankind. It is also a model species for scientific studies on polyploidy and species evolution. Using molecular cytogenetics, we analyzed chromosomes of bread wheat and its diploid and tetraploid progenitor species to reveal evolutionary changes in four different simple sequence repeats. This study further elucidates the rapid changes from the S genome of diploid Aegilops speltoides to the B genome in tetraploid Triticum dicoccum and hexaploid T. aestivum. This explains the difficulty in ascertaining the origin of B genome in bread wheat.

Technical Abstract: During the bread wheat speciation by polyploidization, a series of genome rearrangement and sequence recombination occurred. Simple sequence repeat (SSR) sequences, predominately located in heterochromatic regions of chromosomes, are the effective marker for tracing the genomic DNA sequence variations. However, to date the distribution dynamics of SSRs on chromosomes of bread wheat and its donors, including diploid and tetraploid Triticum urartu, Aegilops speltoides, Ae. tauschii, T. turgidum ssp. dicocoides, reflecting the genome evolution events during bread wheat formation had not been comprehensively investigated.