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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Bioinformatics
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1509669
This article is part of the Research Topic Evolutionary Dynamics, Functional Variation and Application of Plant Organellar Genome View all 9 articles

Feature and Adaptation Evolution of Mitochondrial Genome of Garuga forrestii

Provisionally accepted
Rong Chen Rong Chen Rui Rao Rui Rao Chun Wang Chun Wang Dongbo Zhu Dongbo Zhu Fen Yuan Fen Yuan Liang-Liang Yue Liang-Liang Yue *
  • Southwest Forestry University, Kunming, China

The final, formatted version of the article will be published soon.

    Garuga forrestii W. W. Sm., is a tree species of Burseraceae endemic to China found in hot/warm-dry valleys playing a pivotal role in biodiversity maintenance. We report the first complete mitochondrial genome of this species, which is a typical circular molecule with a length of 606,853 bp, containing 31 tRNA genes, 3 rRNA genes, 35 protein-coding genes, and 1 pseudogene. The high copy number of the trnM-CAT gene (4 copies) facilitated genomic rearrangement and adaptive evolution.The mitochondrial genome shows a low proportion of repetitive sequences (3.30%), indicating a highly conserved structure. Among the 476 RNA editing sites, hydrophilic-hydrophobic and hydrophobic-hydrophobic editing phenomena are most common, accounting for 77.10%. The majority of genes underwent negative selection (Ka/Ks < 1), while a few genes, such as matR, nad3, rps1, rps12, and rps4, exhibited Ka/Ks ratios greater than 1, exhibit signs of positive selection. These genes may have conferred some evolutionary advantages, indicated that the limited genetic variation within the mitochondrial genome experiences undergone adaptive evolution. A significant A/T bias was observed at the third codon position in the G. forrestii mitochondrial genome. Phylogenomic reconstruction of the mitochondrial genome supports the APG IV, with no evidence of horizontal gene transfer detected. This study provides valuable insights into the mitochondrial genomic characteristics of G. forrestii, contributing to our understating of its adaptation mechanisms and evolutionary processes. It also enhances our knowledge of the biogeography of tropical Southeast Asia and Southwest China, shedding light on the evolutionary history of this genus.

    Keywords: Garuga forrestii, Mitochondrial Genome, Phylogenomic, adaptation, Sequence repeats

    Received: 11 Oct 2024; Accepted: 18 Dec 2024.

    Copyright: © 2024 Chen, Rao, Wang, Zhu, Yuan and Yue. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Liang-Liang Yue, Southwest Forestry University, Kunming, China

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