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Updated: May 23, 2025

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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Disentangling serial chloroplast captures in willows.

Diksha Gambhir1, Brian J Sanderson1,2, Minghao Guo1

  • 1Department of Biological Sciences, Texas Tech University, Lubbock, 79409-3131, TX, USA.

American Journal of Botany
|May 7, 2025
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Summary
This summary is machine-generated.

Serial chloroplast capture in Salix involves the replacement of a species

Keywords:
SalicaceaeSalixancient hybridizationchloroplast capturecytonuclear incongruenceintrogressionphylogenomicswillows

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Area of Science:

  • Plant biology
  • Evolutionary genetics
  • Genomics

Background:

  • Chloroplast capture, where one species acquires another's chloroplasts via hybridization and backcrossing, is a known evolutionary phenomenon.
  • Investigating serial chloroplast capture provides insights into the dynamics of organelle DNA inheritance and its impact on plant evolution.

Purpose of the Study:

  • To investigate serial chloroplast capture events in Salix (willows).
  • To understand the capture of the same chloroplast lineage across multiple Salix species.
  • To examine the role of hybridization in chloroplast capture and subsequent speciation.

Main Methods:

  • Phylogenetic analysis of nuclear and chloroplast DNA sequences from various Salix species.
  • Identification of cytonuclear phylogenetic discordance as an indicator of chloroplast capture.
  • Comparison of phylogenetic topologies to distinguish between single, multiple, and serial chloroplast captures.
  • Analysis of nuclear genes involved in cytonuclear interactions and photosynthesis for evidence of introgression.

Main Results:

  • Confirmed instances of serial chloroplast capture and subsequent speciation in Salix.
  • Observed signals of nuclear genome hybridization accompanying chloroplast capture events.
  • Found no increased introgression of nuclear genes related to photosynthesis or cytonuclear interactions in species with chloroplast capture compared to those without.

Conclusions:

  • Serial chloroplast capture is a significant factor in the genomic evolution of Salix.
  • Hybridization and introgression play a complex role in shaping chloroplast and nuclear genomes.
  • This study highlights the intricate evolutionary pathways of organelle genomes in plants.