Data from: Fitness costs of herbicide resistance across natural populations of the common morning glory, Ipomoea purpurea

Although fitness costs associated with plant defensive traits are widely expected, they are not universally detected, calling into question their generality. Here we examine the potential for life history trade-offs associated with herbicide resistance by examining seed germination, root growth, and above-ground growth across 43 naturally occurring populations of Ipomoea purpurea that vary in their resistance to RoundUp®, the most commonly used herbicide worldwide. We find evidence for life history trade-offs associated with all three traits; highly resistant populations had lower germination, shorter roots and smaller above-ground size. A visual exploration of the data indicated that the type of trade-off may differ among populations. Our results demonstrate that costs of adaptation may be present at stages other than simply the production of progeny in this agricultural weed. Additionally, the cumulative effect of costs at multiple life cycle stages can result in severe consequences to fitness when adapting to novel environments.

尽管植物防御性状相关的适合度代价（fitness cost）被广泛预期存在，但并非总能被观测到，这使得其普遍性受到学界质疑。本研究以全球使用最广泛的除草剂农达®（RoundUp®）存在抗性差异的43个天然圆叶牵牛（Ipomoea purpurea）种群为研究对象，通过测定种子萌发、根系生长及地上部生长情况，探讨与除草剂抗性（herbicide resistance）相关的生活史权衡（life history trade-off）的潜在可能性。研究结果显示，三个观测性状均存在显著的生活史权衡效应：高抗性种群的种子萌发率更低、根系更短，且地上部生物量更小。对数据的可视化探索表明，不同种群间的权衡类型可能存在差异。本研究结果证实，在该农田杂草中，适应性代价并非仅存在于子代产生阶段，还可出现在其他生活史阶段。此外，多个生活史阶段的代价累积效应，在生物适应新环境时可对适合度造成严重负面影响。