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草业学报 ›› 2023, Vol. 32 ›› Issue (7): 72-84.DOI: 10.11686/cyxb2022338

• 研究论文 • 上一篇    下一篇

内蒙古两种生态型羊草叶绿体基因组序列差异分析

于晓东(), 余浩洋(), 杨旭, 赵东旭, 张林刚()   

  1. 内蒙古大学生命科学学院,牧草与特色作物生物技术教育部重点实验室,内蒙古 呼和浩特 010070
  • 收稿日期:2022-08-26 修回日期:2022-10-07 出版日期:2023-07-20 发布日期:2023-05-26
  • 通讯作者: 张林刚
  • 作者简介:E-mail: lingangzhang@imu.edu.cn
    于晓东(1997-),男,内蒙古丰镇人,在读硕士。E-mail: 949980902@qq.com
    余浩洋(1998-),女,内蒙古包头人,在读硕士。E-mail: haoyang2018dlq@163.com第一联系人:共同第一作者These authors contributed equally to this work.
  • 基金资助:
    国家自然基金地区项目“两种生态型羊草不同滞绿(Stay-green)特性的机理研究”(3206140110)

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

摘要:

羊草是广泛分布于我国内蒙古草原上的一种优质牧草,根据叶色差异可将其分为灰绿和黄绿两种生态型,前期研究发现二者的叶绿体存在差异,但是造成羊草叶色趋异的分子机理还不清楚。选取内蒙古敕勒川草原的两种生态型羊草,利用Denovo测序平台对二者的叶绿体基因组进行测序和特征分析。结果表明,灰绿型羊草全长136816 bp,大单拷贝区80973 bp,拥有一对长21560 bp的反向重复序列,黄绿型羊草全长136809 bp,大单拷贝区80962 bp,拥有一对长21562 bp的反向重复序列,二者均含有12723 bp的小单拷贝区;二者的叶绿体基因组皆包含131个基因,编码84个蛋白质、8个rRNA和39个tRNA基因;二者都具有丰富的重复序列并存在差异,且大多位于基因间隔区;二者的叶绿体基因组序列相比共发现14个突变区,导致二者反向重复区域收缩/扩张的不同;此外,系统发育分析证明两种生态型羊草与祖先新麦草依然保持较近的亲缘关系。所以,两种生态型羊草的叶绿体基因组序列为解析二者叶色差异提供了分子信息,更为推动羊草叶绿体转化技术奠定了基础。

关键词: 灰绿型羊草, 黄绿型羊草, 叶绿素, 叶绿体基因组

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