Journal
GENOMICS
Volume 113, Issue 5, Pages 2906-2918Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygeno.2021.06.033
Keywords
Convallaria; Intracellular gene transfer; Molecular marker; Direct repeats; Biogeographical studies; Chloroplast genome; Mitochondrial genome
Funding
- National Research Foundation of Korea (NRF), Ministry of Education, the Republic of Korea [2019R1F1A1062102]
- National Research Foundation of Korea [2019R1F1A1062102] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Intracellular gene transfer is common among plant genomes, but chloroplast genomes rarely incorporate foreign genetic material due to their high conservation. Convallaria, a genus of monocotyledonous plants, was found to have mitochondrial DNA sequences in the plastome. New plastid molecular genetic markers were developed to differentiate Convallaria species, revealing a separation into Eurasian and North American lineages during the middle Pliocene. Further studies are needed to understand the integration of the MCP region and gene flow in Convallaria.
Intracellular gene transfer among plant genomes is a common phenomenon. Due to their high conservation and high plastid membrane integrity, chloroplast (cp) genomes incorporate foreign genetic material very rarely. Convallaria is a small monocotyledonous genus consisting of C. keiskei, C. majalis and C. montana. Here, we characterized, analyzed and identified 3.3 and 3.7 kb of mitochondrial DNA sequences in the plastome (MCP) of C. majalis and C. montana, respectively. We identified 6 bp and 23 bp direct repeats and mitochondrial pseudogenes, with rps3, rps19 and rpl10 identified in the MCP region. Additionally, we developed novel plastid molecular genetic markers to differentiate Convallaria spp. based on 21 populations. BEAST and biogeographical analyses suggested that Convallaria separated into Eurasian and North American lineages during the middle Pliocene and originated in East Asia. Vicariance in the genus was followed by dispersal into Europe and southeastern North America. These analyses indicate that the MCP event was restricted to the genus Convallaria of Asparagaceae, in contrast to similar events that occurred in its common ancestors with other families of land plants. However, further mitochondrial and population studies are necessary to understand the integration of the MCP region and gene flow in the genus Convallaria.
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