植物暗呼吸作用对大气CO_2浓度升高的响应

A review on the response of plant′s dark respiration to the elevated CO 2 concentration

植物暗呼吸作用对ＣＯ２浓度升高的响应目前存在两种截然相反的观点：一种认为暗呼吸作用将随着ＣＯ２浓度的升高而下降，可能的原因有胞间ＣＯ２浓度升高、呼吸酶活性改变及暗固定ＣＯ２作用的加强等直接原因；另一种认为暗呼吸作用将随ＣＯ２浓度的升高而提高，影响因素可归结为碳水化合物含量增加、高ＣＯ２浓度刺激其他呼吸途径和生长加快等间接原因。由于目前国际上在实验手段、材料及呼吸作用表达方式等方面的不一致性，这些观点尚难定论，需要更多的实验数据来进一步验证。

The main experimental methods and leading conclusions towards the responses of plant′s dark respiration were reviewed, based on researches developed abroad. Two contradictory conclusions from the existing experiments could be drawn. Some people believed that the dark respiration would be decreased with the elevation of CO 2 concentration, possibly owing to the increase of interceller CO 2 concentration, changes in the respiration enzyme systems and enhancement of dark CO 2 fixation. Others argued that it would be increased, because the increase in the content of non constructural carbohydrate would accelerate the respiration process; faster growth caused by CO 2 enrichment might require more energy and constructural material, which are provided through dark respiration; some respiration pathways such as phosphopentose could be stimulated, with all these together leading to an increase of dark respiration. Much more strictly controlled experiments, however, are still to be conducted before a relatively clear conclusion can be drawn.