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Related Experiment Video

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Novel Sequence Discovery by Subtractive Genomics
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Genomic and transcriptomic resources for candidate gene discovery in the Ranunculids.

Tatiana Arias1,2,3, Diego Mauricio Riaño-Pachón4, Verónica S Di Stilio2

  • 1School of Biological Sciences The University of Hong Kong Pokfulam Hong Kong.

Applications in Plant Sciences
|February 8, 2021
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Summary
This summary is machine-generated.

Researchers generated a draft genome and floral transcriptomes for *Thalictrum* species to study the genetics of pollination syndrome evolution. This resource aids in identifying genes related to floral traits and pollination systems.

Keywords:
RanunculaceaeThalictrum hernandeziiThalictrum thalictroidesdraft genomefloral transcriptomepollination syndromesexual system

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Area of Science:

  • Plant genetics
  • Evolutionary biology
  • Genomics

Background:

  • *Thalictrum* species exhibit transitions from insect to wind pollination, linked to polyploidy and unisexual flowers.
  • The genetic basis for these pollination syndrome shifts in *Thalictrum* remains largely unexplored.
  • Understanding these genetic underpinnings is crucial for evolutionary studies.

Purpose of the Study:

  • To generate a draft genome of *Thalictrum thalictroides*, an ancestral diploid, hermaphrodite, insect-pollinated species.
  • To create floral transcriptomes for *T. thalictroides* and the wind-pollinated, andromonoecious *T. hernandezii*.
  • To provide genomic and transcriptomic resources for identifying candidate genes involved in floral evolution and pollination shifts.

Main Methods:

  • High-throughput sequencing (Illumina HiSeq 2000) was employed for genome and transcriptome generation.
  • De novo assembly was performed to construct the draft genome and analyze transcriptomes.
  • Comparative analysis of transcriptomic data from different pollination systems was utilized.

Main Results:

  • A draft genome assembly for *T. thalictroides* was successfully generated, comprising 44,860 contigs with a total length of 243 Mbp.
  • The genome assembly captured 84.5% of conserved embryophyte single-copy genes, indicating good completeness.
  • Floral transcriptomes contained representations of most eukaryotic core genes, facilitating comparative analyses.

Conclusions:

  • The generated genome and transcriptome data serve as valuable resources for candidate gene discovery in *Thalictrum* floral evolution.
  • Potential candidate genes associated with distinct floral morphologies and pollination systems were identified.
  • Single-copy gene analysis and SSR markers were developed for future population and phylogenetic studies.