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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (7): 72-84.DOI: 10.11686/cyxb2022338

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Difference analysis of chloroplast genome sequence between two ecotypes of Leymus chinensis in Inner Mongolia

Xiao-dong YU(), Hao-yang YU(), Xu YANG, Dong-xu ZHAO, Lin-gang ZHANG()   

  1. School of Life Sciences,Inner Mongolia University,Key Laboratory of Herbage and Endemic Crop Biotechnology,Ministry of Education,Hohhot 010070,China
  • Received:2022-08-26 Revised:2022-10-07 Online:2023-07-20 Published:2023-05-26
  • Contact: Lin-gang ZHANG

Abstract:

Leymus chinensis, a species of high-quality forage grass widely distributed in Inner Mongolia grassland, can be divided into two ecotypes according to the leaf color: gray-green and yellow-green, for which the chloroplastic differences have been previously described, but the molecular basis of the leaf color difference remains unclear. In this study, the chloroplast genomes of two ecotypes of L. chinensis, which were selected from Chilechuan grassland, are sequenced and analyzed using the Denovo sequencing platform. The results show that the gray-green type has a total length of 136816 bp, comprising a large single-copy region of 80973 bp, and a pair of inverted repeats with a length of 21560 bp; The yellow-green type counterpart has a total length of 136809 bp, a large single-copy region of 80962 bp, and a pair of inverted repeats with a length of 21562 bp. Meanwhile, it’s also found that each type contains a small single-copy region of 12723 bp, and each chloroplast genome contains 131 genes, encoding 84 proteins, 8 rRNAs and 39 tRNA genes. The two ecotypes share abundant repeats and differences, mostly located in the inter genic spacer. Moreover, a total of 14 mutated regions are found in the chloroplast genome sequences of the two, resulting in different contraction or expansion of the inverted repeat regions. Also, the phylogenetic analysis suggests kinship with the ancestor Psathyrostachys juncea. In conclusion, the chloroplast genome sequences of the two ecotypes in this study provide molecular information about the basis of the difference of leaf color. This information lays a foundation for the technology of chloroplast transformation.

Key words: gray-green Leymus ecotype, yellow-green Leymus ecotype, chlorophyll, chloroplast genome