Department of Botany, Duke Univrsity, 27706, Durham, North Carolina, USA.
Photosynth Res. 1985 Jan;7(2):175-84. doi: 10.1007/BF00037008.
The effect of long-term exposure to elevated levels of CO2 on biomass partitioning, net photosynthesis and starch metabolism was examined in cotton. Plants were grown under controlled conditions at 350, 675 and 1000 μl l(-1) CO2. Plants grown at 675 and 1000 μl l(-1) had 72% and 115% more dry weight respectively than plants grown at 350 μl l(-1). Increases in weight were partially due to corresponding increases in leaf starch. CO2 enrichment also caused a decrease in chlorophyll concentration and a change in the chlorophyll a/b ratio. High CO2 grown plants had lower photosynthetic capacity than 350 μl l(-1) grown plants when measured at each CO2 concentration. Reduced photosynthetic rates were correlated with high internal (non-stomatal) resistances and higher starch levels. It is suggested that carbohydrate accumulation causes a decline in photosynthesis by feedback inhibition and/or physical damage at the chloroplast level.
长期暴露在高浓度 CO2 下对棉花生物量分配、净光合作用和淀粉代谢的影响进行了研究。在 350、675 和 1000 μl l(-1) CO2 下，在控制条件下种植植物。在 675 和 1000 μl l(-1) CO2 下生长的植物的干重分别比在 350 μl l(-1) CO2 下生长的植物多 72%和 115%。重量的增加部分是由于叶片淀粉相应增加所致。CO2 富集还导致叶绿素浓度降低和叶绿素 a/b 比值发生变化。在每种 CO2 浓度下测量时，高 CO2 生长的植物的光合能力低于 350 μl l(-1)生长的植物。降低的光合速率与高内部（非气孔）阻力和较高的淀粉水平相关。有人认为，碳水化合物的积累通过反馈抑制和/或叶绿体水平的物理损伤导致光合作用下降。
