Lewandowska-Sabat Anna M, Fjellheim Siri, Olsen Jorunn E, Rognli Odd A
Department of Plant Sciences, Faculty of Biosciences, Norwegian University of Life SciencesÅs, Norway.
Front Plant Sci. 2017 Jun 14;8:1046. doi: 10.3389/fpls.2017.01046. eCollection 2017.
Adaptation of plants to local conditions that vary substantially within their geographic range is essential for seasonal timing of flowering, a major determinant of plant reproductive success. This study investigates photoperiodic responses in natural populations of from high northern latitudes and their significance for local adaptation. Thirty lineages from ten local populations, representing different locations across an altitudinal gradient (2-850 m a.s.l.) in Norway, were grown under uniform controlled conditions, and used to screen for responses to five different photoperiods. We studied relationships between variation in photoperiodic sensitivity of flowering time, altitude, and climatic factors associated with the sites of origin. We found that variation in response to photoperiod is significantly correlated with altitude and climatic variables associated with the sites of origin of the populations. Populations originating from lower altitudes showed stronger photoperiodic sensitivity than populations from higher altitudes. Our results indicate that the altitudinal climatic gradient generates clinal variation in adaptive traits in .
植物适应其地理范围内差异很大的当地条件对于开花的季节性时间安排至关重要，而开花时间是植物繁殖成功的主要决定因素。本研究调查了来自高北纬地区的自然种群中的光周期反应及其对局部适应的意义。代表挪威海拔梯度（海拔2 - 850米）不同位置的十个当地种群的30个谱系，在统一的受控条件下生长，并用于筛选对五种不同光周期的反应。我们研究了开花时间的光周期敏感性变化、海拔高度以及与起源地相关的气候因素之间的关系。我们发现，对光周期的反应变化与海拔高度以及与种群起源地相关的气候变量显著相关。来自较低海拔的种群比来自较高海拔的种群表现出更强的光周期敏感性。我们的结果表明，海拔气候梯度在[具体植物名称未给出]中产生了适应性性状的渐变变异。
