Ecological fitting is the forerunner to diversification in a plant virus with broad host range

Area of Science:

• Plant Virology
• Evolutionary Biology
• Ecology

Background:

• Viral evolution studies often overlook complex biotic interactions.
• Understanding host range is crucial for viral fitness and ecological interactions.

Purpose of the Study:

• To investigate the influence of four distinct habitats on the evolution of Watermelon mosaic virus (WMV).
• To analyze the genetic diversity and host species utilization of WMV across different plant communities.

Main Methods:

• Employed a sampling strategy to minimize bias across diverse plant communities.
• Utilized high-throughput sequencing and phylogenetic/network approaches to analyze WMV genetic diversity at local, regional, and global scales.

Main Results:

• WMV incidence and genetic diversity were significantly structured by host species and habitat type.
• A single WMV haplotype infected 11 out of 24 host species, indicating broad host adaptability.
• Habitat type correlated with variations in genetic diversity and host use patterns.

Conclusions:

• Nondeterministic ecological factors play a significant role in structuring WMV genetic diversity.
• Habitat-driven constraints influence host use preferences in WMV evolution.