Experimental evolution across different thermal regimes yields genetic divergence in recombination fraction but no divergence in temperature-associated plastic recombination

Phenotypic plasticity is pervasive in nature. One mechanism underlying the evolution and maintenance of such plasticity is environmental heterogeneity. Indeed, theory indicates that both spatial and temporal variation in the environment should favor the evolution of phenotypic plasticity under a variety of conditions. The frequency of recombination in the model system Drosophila melanogaster has long been known to exhibit phenotypic plasticity in response to temperature. Here were use a panel of replicated experimental evolution populations of D. melanogaster to test whether variable environments favor enhanced plasticity in recombination rate in response to temperature. In contrast to expectation, we find no evidence for enhanced plasticity in recombination in the variable environment lines. Our data confirm a role of temperature in mediating recombination fraction in D. melanogaster, and indicate that recombination is genetically and plastically depressed under lower temperatures. Our...表型可塑性（phenotypic plasticity）在自然界中普遍存在。驱动这类可塑性演化与维持的核心机制之一是环境异质性。事实上，理论研究表明，在多种条件下，环境的空间与时间异质性均会促进表型可塑性的演化。模式生物黑腹果蝇（Drosophila melanogaster）的重组频率长期以来被证实会随温度变化呈现表型可塑性。本研究利用一组重复构建的实验演化黑腹果蝇种群，旨在验证多变环境是否会增强重组率对温度响应的表型可塑性。与预期相悖的是，本研究未在多变环境种群中观察到重组可塑性提升的相关证据。本研究数据证实了温度对黑腹果蝇重组分数的调控作用，并表明低温环境下重组会在遗传与表型层面受到抑制。本研究……