Variation in Plastome Sizes Accompanied by Evolutionary History in Monogenomic Triticeae (Poaceae: Triticeae).

Autor:	Chen N; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Sha LN; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Wang YL; College of Life Science, Shanxi Normal University, Shanxi, China., Yin LJ; Lijiang Nationality Secondary Specialized School, Lijiang, China., Zhang Y; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Wang Y; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Wu DD; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Kang HY; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Zhang HQ; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Zhou YH; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China., Sun GL; Saint Mary's University, Halifax, NS, Canada., Fan X; Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2021 Dec 13; Vol. 12, pp. 741063. Date of Electronic Publication: 2021 Dec 13 (Print Publication: 2021).
DOI:	10.3389/fpls.2021.741063
Abstrakt:	To investigate the pattern of chloroplast genome variation in Triticeae, we comprehensively analyzed the indels in protein-coding genes and intergenic sequence, gene loss/pseudonization, intron variation, expansion/contraction in inverted repeat regions, and the relationship between sequence characteristics and chloroplast genome size in 34 monogenomic Triticeae plants. Ancestral genome reconstruction suggests that major length variations occurred in four-stem branches of monogenomic Triticeae followed by independent changes in each genus. It was shown that the chloroplast genome sizes of monogenomic Triticeae were highly variable. The chloroplast genome of Pseudoroegneria , Dasypyrum , Lophopyrum , Thinopyrum , Eremopyrum , Agropyron , Australopyrum , and Henradia in Triticeae had evolved toward size reduction largely because of pseudogenes elimination events and length deletion fragments in intergenic. The Aegilops / Triticum complex, Taeniatherum , Secale , Crithopsis , Herteranthelium , and Hordeum in Triticeae had a larger chloroplast genome size. The large size variation in major lineages and their subclades are most likely consequences of adaptive processes since these variations were significantly correlated with divergence time and historical climatic changes. We also found that several intergenic regions, such as pet N- trn C and psb E- pet L containing unique genetic information, which can be used as important tools to identify the maternal relationship among Triticeae species. Our results contribute to the novel knowledge of plastid genome evolution in Triticeae. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2021 Chen, Sha, Wang, Yin, Zhang, Wang, Wu, Kang, Zhang, Zhou, Sun and Fan.)
Databáze:	MEDLINE
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