| Autor: |
Yoo, Mi‐Jeong, Koh, Jin, Boatwright, J. Lucas, Soltis, Douglas E., Soltis, Pamela S., Barbazuk, W. Brad, Chen, Sixue |
| Zdroj: |
Plant Journal; Feb2024, Vol. 117 Issue 4, p1191-1205, 15p |
| Abstrakt: |
SUMMARY: Polyploidy is an important evolutionary process throughout eukaryotes, particularly in flowering plants. Duplicated gene pairs (homoeologs) in allopolyploids provide additional genetic resources for changes in molecular, biochemical, and physiological mechanisms that result in evolutionary novelty. Therefore, understanding how divergent genomes and their regulatory networks reconcile is vital for unraveling the role of polyploidy in plant evolution. Here, we compared the leaf transcriptomes of recently formed natural allotetraploids (Tragopogon mirus and T. miscellus) and their diploid parents (T. porrifolius X T. dubius and T. pratensis X T. dubius, respectively). Analysis of 35 400 expressed loci showed a significantly higher level of transcriptomic additivity compared to old polyploids; only 22% were non‐additively expressed in the polyploids, with 5.9% exhibiting transgressive expression (lower or higher expression in the polyploids than in the diploid parents). Among approximately 7400 common orthologous regions (COREs), most loci in both allopolyploids exhibited expression patterns that were vertically inherited from their diploid parents. However, 18% and 20.3% of the loci showed novel expression bias patterns in T. mirus and T. miscellus, respectively. The expression changes of 1500 COREs were explained by cis‐regulatory divergence (the condition in which the two parental subgenomes do not interact) between the diploid parents, whereas only about 423 and 461 of the gene expression changes represent trans‐effects (the two parental subgenomes interact) in T. mirus and T. miscellus, respectively. The low degree of both non‐additivity and trans‐effects on gene expression may present the ongoing evolutionary processes of the newly formed Tragopogon polyploids (~80–90 years). Significance Statement: Tragopogon mirus and T. miscellus are two of six natural allopolyploids known to have formed within the past 160 years, thus affording the opportunity to explore the nearly immediate consequences of polyploidization and speciation outcomes. Here we conducted transcriptomic analyses on Tragopogon polyploids and their diploid progenitors. Previous studies have mainly focused on much older polyploids and their synthetic polyploids, thus our study provides valuable insights into how regulatory divergence occurs in recently formed natural polyploid species. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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