J Syst Evol ›› 2013, Vol. 51 ›› Issue (1): 1-12.doi: 10.1111/j.1759-6831.2012.00228.x

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Plant mitochondrial genome peculiarities evolving in the earliest vascular plant lineages

Volker KNOOP*   

  1. (Abteilung Molekulare Evolution, Institut für Zelluläre und Molekulare Botanik, Universität Bonn, Kirschallee 1, 53115 Bonn, Germany)
  • Received:2012-05-02 Online:2012-09-05 Published:2012-11-15

Abstract: In plants, the mitochondrial DNA has evolved in peculiar ways. Simple circular mitochondrial genomes found in most other eukaryotic lineages have expanded tremendously in size. Mitochondrial DNAs in some flowering plants may in fact be larger than genomes of free-living bacteria. Introns, retrotransposons, pseudogene fragments, and promiscuous DNA copied from the chloroplast or nuclear genome contribute to the size expansion but most intergenic DNA remains unaccounted for so far. Additionally, frequent recombination results in heterogeneous pools of coexisting, subgenomic mtDNA molecules in angiosperms. In contrast, the mitochondrial DNAs of bryophytes, the extant representatives of very early splits in plant phylogeny, are more conservative in structural evolution and seem to be devoid of active recombination. However, whereas mitochondrial introns are highly conserved among seed plants (spermatophytes), not a single one of more than 80 different introns in bryophyte mtDNAs is conserved among the three divisions, liverworts, mosses, and hornworts. Lycophytes are now unequivocally identified as living representatives of the earliest vascular plant branch in a crucial phylogenetic position between bryophytes and later diversifying tracheophytes including spermatophytes. Very recently, mtDNAs have become available for the three orders of extant lycophytes—Isoetales, Selaginellales, and Lycopodiales. As I will discuss here, the lycophyte mtDNAs not only show a surprising diversity of features but also previously unseen novelties of plant mitochondrial DNA evolution. The transition from a gametophyte-dominated bryophyte lifestyle to a sporophyte-dominated vascular plant lifestyle apparently gave rise to several peculiar independent changes in plant chondrome evolution.

Key words: endosymbiotic gene transfer, group I and group II introns, organelle DNA recombination, RNA editing.

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[1] PENG Jian-Zong CHEN Zhao-Ping CHENG Shuang-Qi. Purification and Characterization of Lectin from Bauhinia variegata L.[J]. Chin Bull Bot, 2000, 17(03): 266 -269 .
[2] Zhen Li;Hongzhi Wang;Ruifen Li;Jianhua Wei*. Lignin Biosynthesis and Manipulation in Plants and Utilization of Biomass Energy[J]. Chin Bull Bot, 2009, 44(03): 262 -272 .
[3] . [J]. Chin Bull Bot, 1983, 1(01): 26 -29 .
[4] DING Kun-Shan ZHENG Cai-Xia BAO Ren-Yan JIANG Chun-Ning. Improvement of Two-dimensional Gel Electrophoresis of Proteins from Female Cones of the Female-sterile Pinus tabulaeformis Carr.[J]. Chin Bull Bot, 2005, 22(02): 190 -197 .
[5] Liu Bing-lun. Advances in the Study on the Sporopollenin[J]. Chin Bull Bot, 1985, 3(05): 14 -18 .
[6] Chen Shao-yu. Membrane-Lipid Peroxidation and Plant Stress[J]. Chin Bull Bot, 1989, 6(04): 211 -217 .
[7] Zhiyang Zhang Xinbo Chen Yu Zhang Songhua Long Yuan Gao Ailing Liu. Highly Efficient Adventitious Shoot Induction from Hypocotyl Explants in Linum usitatissimum L.[J]. Chin Bull Bot, 2007, 24(05): 629 -635 .
[8] SUN Xiao-Yun;LU Ying and WU Qing-Yu. The Effects of Deletion of Chlorophyll and Heterotrophy on Phycobiliprotein Content of Cyanobacterium synechocystis sp. PCC6803[J]. Chin Bull Bot, 1998, 15(02): 58 -62 .
[9] XIANG Xu and FU Jia-Rui. The Expression and Regulation of ABA-Responsive Genes and The Relation with Stress[J]. Chin Bull Bot, 1998, 15(03): 11 -16 .
[10] FENG Fu-Juan WANG Feng-You LIU Tong. The Influence Factors of the ISSR-PCR Experiment System on Pinus koraiensis Sieb. et Zucc.[J]. Chin Bull Bot, 2004, 21(03): 326 -331 .