Plant growth in elevated CO2 alters mitochondrial number and chloroplast fine structure
Plant growth in elevated CO2 alters mitochondrial number and chloroplast fine structure
复制标题
DOI：
10.1073/pnas.041620898
复制
发表时间：
2001-02-27
影响因子：
11.1
通讯作者：
Whitehead, D
中科院分区：
文献类型：
--
作者：
Griffin, KL;Anderson, OR;Whitehead, D
随着人们对大气二氧化碳浓度升高对植物生长和全球碳平衡的影响越来越感兴趣，有必要更好地了解植物对大气二氧化碳分压变化的反应。我们的研究表明，二氧化碳浓度升高会导致主要细胞器发生显著的细微结构变化，这似乎是植物对这一全球变化的代谢反应的重要组成部分。在几个不同二氧化碳添加技术的实验设施中对9个物种(代表7个植物科)进行了检测。与低二氧化碳处理相比，高二氧化碳处理使单位细胞面积的线粒体数量增加1.3-2.4倍，并产生叶绿体基质(非压迫型)类囊体膜的数量。线粒体的大小没有明显变化。然而，与二氧化碳对线粒体数量的影响相反，增加的二氧化碳促进了基于质量的暗呼吸速率的降低。这些变化可能反映了植物新陈代谢和能量平衡的重大变化，这可能有助于解释植物生产力对大气CO2浓度升高的反应。
With increasing interest in the effects of elevated atmospheric CO2 on plant growth and the global carbon balance, there is a need for greater understanding of how plants respond to variations in atmospheric partial pressure of CO2. Our research shows that elevated CO2 produces significant fine structural changes in major cellular organelles that appear to be an important component of the metabolic responses of plants to this global change. Nine species (representing seven plant families) in several experimental facilities with different CO2-dosing technologies were examined. Growth in elevated CO2 increased numbers of mitochondria per unit cell area by 1.3-2.4 times the number in control plants grown in lower CO2 and produced a statistically significant increase in the amount of chloroplast stroma (nonappressed) thylakoid membranes compared with those in lower CO2 treatments. There was no observable change in size of the mitochondria. However, in contrast to the CO2 effect on mitochondrial number, elevated CO2 promoted a decrease in the rate of mass-based dark respiration. These changes may reflect a major shift in plant metabolism and energy balance that may help to explain enhanced plant productivity in response to elevated atmospheric CO2 concentrations.