Temperature inducible phenotypic plasticity is a major player in plant responses to climate warming. Functional responses and their role in determining thermal plasticity of plants remain poorly understood. Our objective was to compare trait responses of six populations of Ludwigia peploides resulting from seed from Oceanic climate and from Mediterranean climate after an exposure at three temperatures (16, 24, and 30°C). A comparative analysis showed that at 30°C, the six populations of L. peploides shared different morphological responses, whereas a common pattern of morphological responses was found for the six populations at 16°C. At 16°C, the growth was very low suggesting a stress. At 30°C, the three Mediterranean populations of L. peploides accumulated ≈ sevenfold more total biomass than the populations from Oceanic region. Despite drawing similar response pattern to temperature, the populations showed several different metabolic responses. The thermal plastic responses to the highest temperature differed according to the origin of the populations. The Mediterranean populations of L. peploides could be better adapted to rising temperature. These abilities could allow them to take advantage from climate warming if the temperature is not warming up to temperature above a critical threshold.

中文翻译：

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两个气候区入侵水生植物种群间功能性状的热可塑性变化

温度诱导表型可塑性是植物对气候变暖的反应的主要参与者。功能反应及其在确定植物热塑性方面的作用仍然知之甚少。我们的目标是比较来自海洋气候和地中海气候的种子在三种温度（16、24 和 30°C）下暴露后产生的六个 Ludwigia peploides 种群的性状响应。比较分析表明，在 30°C 下，L. peploides 的六个种群具有不同的形态响应，而在 16°C 下，六个种群的形态响应具有共同的模式。在 16°C 时，生长非常低，表明存在压力。在 30°C 时，L. peploides 的三个地中海种群累积的总生物量是大洋区种群的 7 倍。尽管对温度有相似的反应模式，但这些种群表现出几种不同的代谢反应。对最高温度的热塑性响应因种群起源而异。L. peploides 的地中海种群可以更好地适应不断升高的温度。如果温度没有升高到临界阈值以上，这些能力可以让他们利用气候变暖。