Griffin K L, Anderson O R, Gastrich M D, Lewis J D, Lin G, Schuster W, Seemann J R, Tissue D T, Turnbull M H, Whitehead D
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.
Proc Natl Acad Sci U S A. 2001 Feb 27;98(5):2473-8. doi: 10.1073/pnas.041620898.
With increasing interest in the effects of elevated atmospheric CO(2) 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 CO(2). Our research shows that elevated CO(2) 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 CO(2)-dosing technologies were examined. Growth in elevated CO(2) increased numbers of mitochondria per unit cell area by 1.3-2.4 times the number in control plants grown in lower CO(2) and produced a statistically significant increase in the amount of chloroplast stroma (nonappressed) thylakoid membranes compared with those in lower CO(2) treatments. There was no observable change in size of the mitochondria. However, in contrast to the CO(2) effect on mitochondrial number, elevated CO(2) 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 CO(2) concentrations.
随着人们对大气中二氧化碳浓度升高对植物生长及全球碳平衡影响的兴趣日益增加，有必要更深入地了解植物如何应对大气中二氧化碳分压的变化。我们的研究表明，二氧化碳浓度升高会使主要细胞器产生显著的精细结构变化，这似乎是植物对这种全球变化代谢反应的一个重要组成部分。我们在几个采用不同二氧化碳添加技术的实验设施中，对九个物种（代表七个植物科）进行了研究。与生长在较低二氧化碳浓度下的对照植物相比，在高二氧化碳浓度下生长的植物，单位细胞面积内的线粒体数量增加了1.3至2.4倍，并且叶绿体基质（非堆叠）类囊体膜的数量在统计学上显著增加。线粒体的大小没有可观察到的变化。然而，与二氧化碳对线粒体数量的影响相反，高二氧化碳浓度会促使基于质量的暗呼吸速率下降。这些变化可能反映了植物新陈代谢和能量平衡的重大转变，这或许有助于解释在大气二氧化碳浓度升高时植物生产力提高的现象。
