Genome Size Variation in Plant Systems

Genome size variation in plants spans several orders of magnitude, reflecting differences in repetitive DNA content, polyploidy and transposable element activity. This variation influences cell size, development rates and metabolic demands, thereby affecting growth, reproduction and ecological interactions. Genome expansions often result from polyploidization and transposon proliferation, while contractions arise through DNA deletion and genome streamlining. Such dynamic balance shapes species’ evolutionary trajectories, biodiversity patterns and adaptive capacity. Understanding genome size is crucial for predicting biomass production, nutrient‐use efficiency and community composition, with implications for conservation, crop breeding and ecosystem management under changing environmental conditions.

Research from Nature Portfolio

Phylogenetic comparative analyses of limestone‐karst specialists have revealed that leaf nitrogen availability is a key driver of genome size evolution. In these soil‐specialist species, genome sizes correlate positively with plant nitrogen content, indicating that under nitrogen limitation smaller genomes confer an advantage by reducing the nutrient cost of DNA synthesis. This study proposes that competition for nitrogen between genomic and cellular functions shapes genome architecture in nutrient‐poor habitats, offering a model for how edaphic constraints direct genomic evolution.

Genome Size Variation in Plant Systems publication trend

The graph below shows the total number of articles in genome size variation in plant systems across all publications each year (not limited to Nature Index journals).

Technical terms

Genome size (C‐value): The total amount of DNA in one copy of a genome, typically measured in picograms (pg).

Polyploidy: The state of having more than two complete sets of chromosomes in a cell, often leading to genome duplication.

Transposable elements: DNA sequences capable of moving within the genome, contributing to genome expansion and structural variation.

Flow cytometry: A technique for measuring physical and chemical characteristics of cells or nuclei, including DNA content, by suspending them in fluid and passing them through a laser beam.

Phylogenetic comparative methods: Analytical approaches that incorporate evolutionary relationships when comparing biological traits across species.

References

1. Genome size influences plant growth and biodiversity responses to nutrient fertilization in diverse grassland communities. PLOS Biology (2024).
2. Genome size variation and polyploidy prevalence in the genus Eragrostis are associated with the global dispersal in arid area. Frontiers in Plant Science (2023).
3. Nitrogen limitation as a driver of genome size evolution in a group of karst plants. Scientific Reports (2015).