Does Asymmetric Reproductive Isolation Predict the Direction of Introgression in Plants?

Summary: Imagine two different species of wildflowers growing side by side. Usually, nature prefers them to stay separate, but sometimes they cross-breed. Interestingly, this relationship is often a one-way street: Species A might readily accept pollen from Species B, while Species B completely rejects pollen from Species A. This is called "Asymmetric Reproductive Isolation."

Scientists investigated whether this "one-way door" policy in initial mating predicts how genes eventually mix between populations over time. The findings suggest that yes, the direction of the initial mating barrier often acts like a traffic sign, predicting which species will absorb genes from the other. This helps biologists understand how plant species maintain their identities or merge together in the wild.