Phylogenetic and comparative analyses of Hydnora abyssinica plastomes provide evidence for hidden diversity within Hydnoraceae

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Elijah Mbandi Mkala - , CAS - Chinese Academy of Sciences, University of Chinese Academy of Sciences (UCAS) (Author)
  • Matthias Jost - , Chair of Botany (Author)
  • Xiang Dong - , CAS - Chinese Academy of Sciences, University of Chinese Academy of Sciences (UCAS) (Author)
  • Geoffrey Mwachala - , National Museums of Kenya (Author)
  • Paul Mutuku Musili - , National Museums of Kenya (Author)
  • Stefan Wanke - , Chair of Botany, Universidad Nacional Autónoma de México (Author)
  • Guang Wan Hu - , CAS - Chinese Academy of Sciences (Author)
  • Qing Feng Wang - , CAS - Chinese Academy of Sciences (Author)

Abstract

Background: To date, plastid genomes have been published for all but two holoparasitic angiosperm families. However, only a single or a few plastomes represent most of these families. Of the approximately 40 genera of holoparasitic angiosperms, a complete plastid genome sequence is available for only about half. In addition, less than 15 species are currently represented with more than one published plastid genome, most of which belong to the Orobanchaceae. Therefore, a significant portion of the holoparasitic plant plastome diversity remains unexplored. This limited information could hinder potential evolutionary pattern recognition as well as the exploration of inter- and intra-species plastid genome diversity in the most extreme holoparasitic angiosperms. Results: Here, we report the first plastomes of Kenyan Hydnora abyssinica accessions. The plastomes have a typical quadripartite structure and encode 24 unique genes. Phylogenetic tree reconstruction recovers the Kenyan accessions as monophyletic and together in a clade with the Namibian H. abyssinica accession and the recently published H. arabica from Oman. Hydnora abyssinica as a whole however is recovered as non-monophyletic, with H. arabica nested within. This result is supported by distinct structural plastome synapomorphies as well as pairwise distance estimates that reveal hidden diversity within the Hydnora species in Africa. Conclusion: We propose to increase efforts to sample widespread holoparasitic species for their plastid genomes, as is the case with H. abyssinica, which is widely distributed in Africa. Morphological reinvestigation and further molecular data are needed to fully investigate the diversity of H. abyssinica along the entire range of distribution, as well as the diversity of currently synonymized taxa.

Details

Original languageEnglish
Article number34
JournalBMC Ecology and Evolution
Volume23
Issue number1
Publication statusPublished - Dec 2023
Peer-reviewedYes

External IDs

PubMed 37464315

Keywords

Keywords

  • Heterotrophy, Kenya, Monophyly, Piperales, Plastome condensation, Taita hills