Transposon-linked plasticity may contribute to drought tolerance in a pantropical invader, Mikania micrantha

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ID: 327181
2026
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Abstract
BACKGROUND AND AIMS: Plant invasion poses severe threats to biodiversity, ecosystem stability, and human society. The prevailing "small-genome advantage" hypothesis-which attributes invasiveness to compact genomes that allow fast growth, high seed output, and short generation times-cannot explain why some aggressive invaders carry relatively large genomes. Here, we seek to explore why some large-genome plants are highly invasive. METHODS: Using the pantropical, large-genome invader Mikania micrantha as a model, we integrate controlled experiments, whole-genome resequencing, and transcriptomics to show that long-terminal-repeat retrotransposons (LTR-RTs)-the dominant repeats comprising 54.22% of its genome-may confer an advantage during rapid range expansion. KEY RESULTS: Populations with larger genomes tended to exhibit stronger drought responsive activation of specific Ty1-copia and Ty3-gypsy retrotransposons. These elements may contribute to phenylpropanoid pathway activation, which indicates a potentially adaptive role of phenylpropanoids in drought response. CONCLUSIONS: Genomic abundance is associated with environmental responsiveness, and LTR-RTs may function as eco-evolutionary catalysts that could allow large-genome plants to expand their ranges and become formidable invaders. Our findings uncover a previously overlooked benefit of large genomes and highlight transposon-driven plasticity as a candidate driver of invasion success worthy of further investigation.
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Authors Yihan Du, Tianjiao Shi, Kaichi Huang, An Zou, Yuchen Yang, Huixuan Liao
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Journal Annals of botany
Year 2026
DOI
10.1093/aob/mcag278
URL
https://doi.org/10.1093/aob/mcag278
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