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首页> 外文OA文献 >Acclimation of Photosynthesis to Elevated CO2 under Low-Nitrogen Nutrition Is Affected by the Capacity for Assimilate Utilization. Perennial Ryegrass under Free-Air CO2 Enrichment1
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Acclimation of Photosynthesis to Elevated CO2 under Low-Nitrogen Nutrition Is Affected by the Capacity for Assimilate Utilization. Perennial Ryegrass under Free-Air CO2 Enrichment1

机译：光合作用对二氧化碳浓度升高的适应 下 低氮营养受生产能力的影响 吸收利用率。多年生黑麦草 自由空气 二氧化碳浓缩1

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Acclimation of photosynthesis to elevated CO2 has previously been shown to be more pronounced when N supply is poor. Is this a direct effect of N or an indirect effect of N by limiting the development of sinks for photoassimilate? This question was tested by growing a perennial ryegrass (Lolium perenne) in the field under elevated (60 Pa) and current (36 Pa) partial pressures of CO2 (pCO2) at low and high levels of N fertilization. Cutting of this herbage crop at 4- to 8-week intervals removed about 80% of the canopy, therefore decreasing the ratio of photosynthetic area to sinks for photoassimilate. Leaf photosynthesis, in vivo carboxylation capacity, carbohydrate, N, ribulose-1,5-bisphosphate carboxylase/oxygenase, sedoheptulose-1,7-bisphosphatase, and chloroplastic fructose-1,6-bisphosphatase levels were determined for mature lamina during two consecutive summers. Just before the cut, when the canopy was relatively large, growth at elevated pCO2 and low N resulted in significant decreases in carboxylation capacity and the amount of ribulose-1,5-bisphosphate carboxylase/oxygenase protein. In high N there were no significant decreases in carboxylation capacity or proteins, but chloroplastic fructose-1,6-bisphosphatase protein levels increased significantly. Elevated pCO2 resulted in a marked and significant increase in leaf carbohydrate content at low N, but had no effect at high N. This acclimation at low N was absent after the harvest, when the canopy size was small. These results suggest that acclimation under low N is caused by limitation of sink development rather than being a direct effect of N supply on photosynthesis.
机译：以前，当氮供应不足时，光合作用对升高的CO2的适应作用更加明显。这是N的直接作用还是N的间接作用，是通过限制光同化物吸收剂的发展来实现的？通过在较高和较低水平的氮肥水平下在较高的CO2分压（pCO2）（60 Pa）和当前压力（36 Pa）下在田间种植多年生黑麦草（Lolium perenne）来测试此问题。以4到8周的间隔对该草料作物进行砍伐可去除约80％的冠层，因此降低了光合面积与用于光吸收的汇的比例。确定了连续两个夏季的成熟叶片的叶片光合作用，体内羧化能力，碳水化合物，氮，核糖-1,5-双磷酸羧化酶/加氧酶，七庚二糖-1,7-双磷酸酶和叶绿体果糖-1,6-双磷酸酶的水平。 。就在割草之前，当树冠相对较大时，在较高的pCO2和低N的条件下生长会导致羧化能力和1,5-双磷酸核糖羧化酶/加氧酶蛋白含量的显着下降。在高氮条件下，羧化能力或蛋白质没有显着降低，但是叶绿体-1,6-二磷酸果糖的蛋白质水平显着增加。在低氮下，较高的pCO2导致叶片碳水化合物含量显着增加，但在高氮下则无影响。当冠层尺寸较小时，在收获后就没有低氮适应。这些结果表明，低氮条件下的驯化是由水槽发育的限制引起的，而不是氮供应对光合作用的直接影响。

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