Impact of growth temperature on scaling relationships linking photosynthetic metabolism to leaf functional traits
Impact of growth temperature on scaling relationships linking photosynthetic metabolism to leaf functional traits
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DOI：
10.1111/j.1365-2435.2010.01758.x
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发表时间：
2010-12-01
影响因子：
5.2
通讯作者：
Atkin, Owen K.
中科院分区：
文献类型：
--
作者：
Atkinson, Lindsey J.;Campbell, Catherine D.;Atkin, Owen K.
P>1。将光合作用 (A) 与叶片性状联系起来的标度关系对于预测植被模式和植物-大气碳通量非常重要。在这里，我们研究了生长温度对这种缩放关系的影响。2．我们评估了生长温度的变化是否系统地改变了在受控环境柜中在四种温度（7、14、21和28摄氏度）下水培生长的19种对比植物物种的A与单位叶面积（LMA）叶质量、氮和磷浓度的双对数图的斜率和/或截距。对在 21 摄氏度下生长的现有 (PE) 叶子经历 10 天生长温度（7、14、21 和 28 摄氏度）处理的反应以及在四个新生长温度下形成的新发育 (ND) 叶子的反应进行了量化。无论生长温度处理如何，光饱和光合作用速率 (A) 均在 21 摄氏度下测量。3。生长温度的变化改变了现有 (PE) 叶子中 A 和叶子性状之间的比例，热历史分别占质量和面积变化的 17% 和 31%。然而，当对每个生长温度下形成的新发育（ND）叶子进行比较时，生长温度在解释分散性方面几乎没有任何作用。4．光合氮和磷的利用效率（分别为 PNUE 和 PPUE）随着 LMA 的增加而降低。不同物种之间未发现温度介导的PE叶PNUE或PPUE降低的系统性差异。5．总体而言，这些结果强调了叶片发育在确定生长温度持续变化对光合作用与其他叶片性状之间的尺度关系的影响方面的重要性。
P>1. Scaling relationships linking photosynthesis (A) to leaf traits are important for predicting vegetation patterns and plant-atmosphere carbon fluxes. Here, we investigated the impact of growth temperature on such scaling relationships.2. We assessed whether changes in growth temperature systematically altered the slope and/or intercepts of log-log plots of A vs leaf mass per unit leaf area (LMA), nitrogen and phosphorus concentrations for 19 contrasting plant species grown hydroponically at four temperatures (7, 14, 21 and 28 degrees C) in controlled environment cabinets. Responses of 21 degrees C-grown pre-existing (PE) leaves experiencing a 10 day growth temperature (7, 14, 21 and 28 degrees C) treatment, and newly-developed (ND) leaves formed at each of the four new growth temperatures, were quantified. Irrespective of the growth temperature treatment, rates of light-saturated photosynthesis (A) were measured at 21 degrees C.3. Changes in growth temperature altered the scaling between A and leaf traits in pre-existing (PE) leaves, with thermal history accounting for up to 17% and 31% of the variation on a mass and area basis, respectively. However, growth temperature played almost no role in accounting for scatter when comparisons were made of newly-developed (ND) leaves that form at each growth temperature.4. Photosynthetic nitrogen and phosphorus use efficiency (PNUE and PPUE, respectively) decreased with increasing LMA. No systematic differences in temperature-mediated reductions in PNUE or PPUE of PE leaves were found among species.5. Overall, these results highlight the importance of leaf development in determining the effects of sustained changes in growth temperature on scaling relationships linking photosynthesis to other leaf traits.