Départemente de Phytologie, Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, Québec, Quebec, Canada G1K 7P4.
Plant Physiol. 1989 Aug;90(4):1465-72. doi: 10.1104/pp.90.4.1465.
Lycopersicon esculentum Mill. cv Vedettos and Lycopersicon chmielewskii Rick, LA 1028, were exposed to two CO(2) concentrations (330 or 900 microliters per liter) for 10 weeks. Tomato plants grown at 900 microliters per liter contained more starch and more sugars than the control. However, we found no significant accumulation of starch and sugars in the young leaves of L. esculentum exposed to high CO(2). Carbon exchange rates were significantly higher in CO(2)-enriched plants for the first few weeks of treatment but thereafter decreased as tomato plants acclimated to high atmospheric CO(2). This indicates that the long-term decline of photosynthetic efficiency of leaf 5 cannot be attributed to an accumulation of sugar and/or starch. The average concentration of starch in leaves 5 and 9 was always higher in L. esculentum than in L. chmielewskii (151.7% higher). A higher proportion of photosynthates was directed into starch for L. esculentum than for L. chmielewskii. However, these characteristics did not improve the long-term photosynthetic efficiency of L. chmielewskii grown at high CO(2) when compared with L. esculentum. The chloroplasts of tomato plants exposed to the higher CO(2) concentration exhibited a marked accumulation of starch. The results reported here suggest that starch and/or sugar accumulation under high CO(2) cannot entirely explain the loss of photosynthetic efficiency of high CO(2)-grown plants.
栽培番茄（Lycopersicon esculentum Mill. cv Vedettos）和野生番茄（Lycopersicon chmielewskii Rick）LA1028 暴露于两种 CO2 浓度（330 或 900 微升/升）中 10 周。在 900 微升/升 CO2 下生长的番茄植物比对照含有更多的淀粉和糖。然而，我们发现，在高 CO2 下暴露的番茄幼叶中，淀粉和糖并没有明显积累。在处理的前几周，富 CO2 植物的碳交换率显著升高，但此后随着番茄植物适应高大气 CO2，碳交换率下降。这表明，叶片 5 光合作用效率的长期下降不能归因于糖和/或淀粉的积累。叶片 5 和 9 中淀粉的平均浓度在栽培番茄中始终高于野生番茄（高 151.7%）。与野生番茄相比，栽培番茄有更高比例的光合产物被导向淀粉。然而，与栽培番茄相比，这些特性并没有提高在高 CO2 下生长的野生番茄的长期光合作用效率。暴露在较高 CO2 浓度下的番茄叶绿体明显积累了淀粉。本研究结果表明，高 CO2 下淀粉和/或糖的积累不能完全解释高 CO2 生长植物光合作用效率的丧失。
