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首页> 外文期刊>Acta Physiologiae Plantarum >Modulation of Rubisco activity in leaves of Prosopis juliflora in response to tropical conditions in north India
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Modulation of Rubisco activity in leaves of Prosopis juliflora in response to tropical conditions in north India

机译：印度北部对热带条件下胡s叶中Rubisco活性的调节

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摘要

The success of P. juliflora, an evergreen woody species has been largely attributed to temperature acclimation and stomatal control of photosynthesis under wide range of environmental conditions prevalent in India. We studied the contribution of the enzyme ribulose-1,5 bisphosphate carboxylase/oxygenase (Rubisco) in diurnal and seasonal photosynthesis changes in P. juliflora. The changes observed in photosynthesis under natural conditions could be effected by the growth temperatures, which ranged from 10–30 °C in winter to 30–47 °C in summer. However, the Total Rubisco activity displayed a constant diurnal pattern and showed a maximum at 1200 in all seasons namely spring, summer, monsoon and winter irrespective of the changes in temperature. The Total Rubisco activity from two cohorts of leaves produced in spring and monsoon appeared to be down-regulated differentially at low PPFD during the evening. The in vivo and in vitro measurements of carboxylation efficiency of Rubisco showed wide variation during the day and were correlated with the photosynthesis rate. The light activation of Rubisco showed the acclimation to moderately high temperatures in different seasons except in summer. The exceptionally high temperatures (>45 °C) in summer, though not affecting Total activity, severely inhibited the light activation of Rubisco and also modulated the recovery process for the activation of Rubisco. Our studies suggest that the modulation of Rubisco driven by Rubisco activase and not Rubisco per se was crucial for the diurnal regulation of photosynthesis.
机译：常绿木本植物胡杨木的成功很大程度上归因于在印度普遍存在的各种环境条件下的温度适应和光合作用的气孔控制。我们研究了核果糖-1,5-二磷酸羧化酶/加氧酶（Rubisco）在水母日光和季节性光合作用变化中的作用。在自然条件下观察到的光合作用变化可能受到生长温度的影响，生长温度的范围从冬天的10–30°C到夏天的30–47°C。但是，总Rubisco活性显示出恒定的昼夜模式，并且在所有季节（春季，夏季，季风和冬季）的最高值都显示在1200，而与温度变化无关。在春季和季风期间，两个队列的总Rubisco活性在傍晚低PPFD下似乎有所下调。 Rubisco的羧化效率的体内和体外测量显示白天变化很大，并且与光合作用速率相关。 Rubisco的光活化表明除夏季外，不同季节的温度都适应了中等高温。夏季异常高的温度（> 45°C）尽管不影响总活性，但严重抑制了Rubisco的光活化，并调节了Rubisco活化的恢复过程。我们的研究表明，由Rubisco活化酶而非Rubisco本身驱动的Rubisco调节对于光合作用的昼夜调节至关重要。

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