Ecophysiologists have reported a range of relationships, including intrinsic trade-offs across and within species between plant relative growth rate in high resource conditions (RGR) vs adaptation to tolerate cold or arid climates, arising from trait-based mechanisms. Few studies have considered ecotypes within a species, in which the lack of a trade-off would contribute to a wide species range and resilience to climate change. For 15 ecotypes of Arabidopsis thaliana in a common garden we tested for associations between RGR vs adaptation to cold or dry native climates and assessed hypotheses for its mediation by 15 functional traits. Ecotypes native to warmer, drier climates had higher leaf density, leaf mass per area, root mass fraction, nitrogen per leaf area and carbon isotope ratio, and lower osmotic potential at full turgor. Relative growth rate was statistically independent of the climate of the ecotype native range and of individual functional traits. The decoupling of RGR and cold or drought adaptation in Arabidopsis is consistent with multiple stress resistance and avoidance mechanisms for ecotypic climate adaptation and would contribute to the species' wide geographic range and resilience as the climate changes.

中文翻译：

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测试拟南芥自然生态型的相对生长速率和气候适应之间的关联。

生态生理学家报告了一系列关系，包括在高资源条件下植物相对生长率 (RGR) 与适应寒冷或干旱气候之间的物种之间和物种内部的内在权衡，这是由基于特征的机制引起的。很少有研究考虑物种内的生态型，其中缺乏权衡将有助于广泛的物种范围和对气候变化的适应力。对于一个普通花园中的 15 种拟南芥生态型，我们测试了 RGR 与对寒冷或干燥原生气候的适应之间的关联，并评估了 15 种功能性状对其介导的假设。原产于温暖、干燥气候的生态型具有较高的叶密度、每面积叶质量、根质量分数、每叶面积氮和碳同位素比，并且在完全膨胀时渗透势较低。相对生长率在统计上独立于生态型原生范围的气候和个体功能性状。拟南芥 RGR 与寒冷或干旱适应的脱钩与生态型气候适应的多重抗逆和回避机制一致，并将有助于该物种在气候变化时的广泛地理范围和恢复力。