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首页> 外文期刊>Journal of Experimental Botany >Leaf structural characteristics are less important than leaf chemical properties in determining the response of leaf mass per area and photosynthesis of Eucalyptus saligna to industrial-age changes in [CO2] and temperature.
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Leaf structural characteristics are less important than leaf chemical properties in determining the response of leaf mass per area and photosynthesis of Eucalyptus saligna to industrial-age changes in [CO2] and temperature.

机译：在确定每单位面积的叶片质量以及光生桉树对[CO 2 ]和温度的工业年龄变化的响应时，叶片的结构特征不如叶片的化学特性重要。

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摘要

The rise in atmospheric [CO2] is associated with increasing air temperature. However, studies on plant responses to interactive effects of [CO2] and temperature are limited, particularly for leaf structural attributes. In this study, Eucalyptus saligna plants were grown in sun-lit glasshouses differing in [CO2] (290, 400, and 650 micro mol mol-1) and temperature (26 degrees C and 30 degrees C). Leaf anatomy and chloroplast parameters were assessed with three-dimensional confocal microscopy, and the interactive effects of [CO2] and temperature were quantified. The relative influence of leaf structural attributes and chemical properties on the variation of leaf mass per area (LMA) and photosynthesis within these climate regimes was also determined. Leaf thickness and mesophyll size increased in higher [CO2] but decreased at the warmer temperature; no treatment interaction was observed. In pre-industrial [CO2], warming reduced chloroplast diameter without altering chloroplast number per cell, but the opposite pattern (reduced chloroplast number per cell and unchanged chloroplast diameter) was observed in both current and projected [CO2]. The variation of LMA was primarily explained by total non-structural carbohydrate (TNC) concentration rather than leaf thickness. Leaf photosynthetic capacity (light- and [CO2]-saturated rate at 28 degrees C) and light-saturated photosynthesis (under growth [CO2] and temperature) were primarily determined by leaf nitrogen contents, while secondarily affected by chloroplast gas exchange surface area and chloroplast number per cell, respectively. In conclusion, leaf structural attributes are less important than TNC and nitrogen in affecting LMA and photosynthesis responses to the studied climate regimes, indicating that leaf structural attributes have limited capacity to adjust these functional traits in a changing climate.
机译：大气中[CO 2 ]的升高与气温升高有关。然而，关于植物对[CO 2 ]和温度相互作用的反应的研究是有限的，特别是对于叶片的结构属性。在这项研究中，Saligna Eucalyptus saligna植物生长在[CO 2 ]（290、400和650 micro mol mol -1 ）和温度（ 26摄氏度和30摄氏度）。用三维共聚焦显微镜评估叶片的解剖结构和叶绿体参数，并定量[CO 2 ]和温度的相互作用。在这些气候条件下，还确定了叶片结构属性和化学性质对单位面积叶片质量（LMA）和光合作用变化的相对影响。 [CO 2 ]较高时，叶片厚度和叶肉大小增加，但温度升高时则减小;没有观察到治疗相互作用。在工业化前[CO 2 ]中，升温降低了叶绿体直径，而没有改变每个细胞的叶绿体数量，但是在当前和预计的情况下观察到相反的模式（每个细胞的叶绿体数量减少和叶绿体直径不变）[ CO 2 ]。 LMA的变化主要由总非结构性碳水化合物（TNC）浓度而不是叶片厚度来解释。叶片的光合作用能力（光和[CO 2 ]在28℃下的饱和速率）和光饱和的光合作用（在[CO 2 ]的生长和温度下）是主要的由叶中的氮含量确定，其次分别受叶绿体气体交换表面积和每个细胞的叶绿体数量影响。总之，在影响LMA和光合作用对气候条件的影响方面，叶片结构属性不如TNC和氮重要，表明叶片结构属性在气候变化中调节这些功能性状的能力有限。

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