ACCLIMATION OF PHOTOSYNTHESIS TO ELEVATED CO2 IN 5 C-3 SPECIES
ACCLIMATION OF PHOTOSYNTHESIS TO ELEVATED CO2 IN 5 C-3 SPECIES
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DOI：
10.1104/pp.89.2.590
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发表时间：
1989-02-01
期刊：
影响因子：
7.4
通讯作者：
SEEMANN, JR
中科院分区：
文献类型：
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作者：
SAGE, RF;SHARKEY, TD;SEEMANN, JR
以5种C3植物（Chenopodium album, Phaseolus vulgaris, Solanum tuberosum, Solanum melongena, Brassica oleacea）为研究材料，在300或900 ~ 1000微大气压下，研究了长期（周~月）CO2增强对(a)气体交换特性，(b)核酮糖-1,5-二磷酸羧化酶（rubisco）含量和激活状态，以及(c)叶片氮、叶绿素和单位面积干重的影响。长期暴露于高CO2环境下，对光合作用的CO2响应有三种影响：(a) CO2响应的初始斜率不受影响，但高CO2环境下的光合速率增加（S. tuberosum）；(b)初始坡度减小，但光合作用co2饱和速率受影响不大（C. album， P. vulgaris）；(c)初始坡度和光合作用co2饱和速率均降低（甘蓝、黑穗槐）。在所有五个物种中，在高CO2环境下，随着O2分压的降低或测量CO2浓度高于600微巴时，光合作用受到刺激的程度增加。这种刺激表明，适应高CO2后，正磷酸盐再生能力对光合作用的限制减少或消失。每面积叶片氮含量随CO2浓度的增加或增加（黑穗槐、黑穗槐），或变化不大。rubisco的含量在5个物种中只有2个物种较低，但其激活状态在长期暴露于高CO2后均降低了19%至48%。这些结果表明，在富含二氧化碳的空气中生长期间，叶片rubisco含量仍然超过支持观察到的光合速率所需的含量。
The effect of long-term (weeks to months) CO2 enhancement on (a) the gas-exchange characteristics, (b) the content and activation state of ribulose-1,5-bisphosphate carboxylase (rubisco), and (c) leaf nitrogen, chlorophyll, and dry weight per area were studied in five C3 species (Chenopodium album, Phaseolus vulgaris, Solanum tuberosum, Solanum melongena, and Brassica oleracea) grown at CO2 partial pressures of 300 or 900 to 1000 microbars. Long-term exposure to elevated CO2 affected the CO2 response of photosynthesis in one of three ways: (a) the initial slope of the CO2 response was unaffected, but the photosynthetic rate at high CO2 increased (S. tuberosum); (b) the initial slope decreased but the CO2-saturated rate of photosynthesis was little affected (C. album, P. vulgaris); (c) both the initial slope and the CO2-saturated rate of photosynthesis decreased (B. oleracea, S. melongena). In all five species, growth at high CO2 increased the extent to which photosynthesis was stimulated following a decrease in the partial pressure of O2 or an increase in measurement CO2 above 600 microbars. This stimulation indicates that a limitation on photosynthesis by the capacity to regenerate orthophosphate was reduced or absent after acclimation to high CO2. Leaf nitrogen per area either increased (S. tuberosum, S. melongena) or was little changed by CO2 enhancement. The content of rubisco was lower in only two of the five species, yet its activation state was 19% to 48% lower in all five species following long-term exposure to high CO2. These results indicate that during growth in CO2-enriched air, leaf rubisco content remains in excess of that required to support the observed photosynthetic rates.