Genotypic Variation of Transgenerational Plasticity Can Be Explained by Environmental Predictability at Origins

Transgenerational plasticity is the plastic response of offspring to ancestral environments. Theoretical studies and experimental evolution have demonstrated the importance of environmental predictability in driving the evolution of transgenerational plasticity. Nevertheless, the contribution of environmental predictability to the variation of transgenerational plasticity in nature remains unexplored. Here, we took advantage of the natural variation of Arabidopsis thaliana, and employed genotypes collected from different geographic locations to explore their transgenerational effects in response to drought and nutrient addition. We found that transgenerational plasticity depended on the offspring environment and the genotype. In particular, we found that genotypes with greater transgenerational plasticity in reproductive traits came from locations with greater temporal autocorrelation of annual temperature and precipitation. These results suggest that the evolutionary process shaping natural variation of transgenerational effect is not random, and the predictability of natural environments may contribute to the evolution of transgenerational effects. While the robustness of our study is limited by the number of genotypes analyzed, we hope this study provides an incentive to conduct a more comprehensive analysis towards understanding natural divergence of transgenerational plasticity.