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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Formation of chloroplast protrusions and catalase activity in alpine Ranunculus glacialis under elevated temperature and different CO2/O-2 ratios
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Formation of chloroplast protrusions and catalase activity in alpine Ranunculus glacialis under elevated temperature and different CO2/O-2 ratios

机译：高温和不同CO2 / O-2比下高山高山毛an的叶绿体突起形成和过氧化氢酶活性

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摘要

Chloroplast protrusions (CPs) have frequently been observed in plants, but their significance to plant metabolism remains largely unknown. We investigated in the alpine plant Ranunculus glacialis L. treated under various CO2 concentrations if CP formation is related to photorespiration, specifically focusing on hydrogen peroxide (H2O2) metabolism. Immediately after exposure to different CO2 concentrations, the formation of CPs in leaf mesophyll cells was assessed and correlated to catalase (CAT) and ascorbate peroxidase (APX) activities. Under natural irradiation, the relative proportion of chloroplasts with protrusions (rCP) was highest (58.7 %) after exposure to low CO2 (38 ppm) and was lowest (3.0 %) at high CO2 (10,000 ppm). The same relationship was found for CAT activity, which decreased from 34.7 nkat mg(-1) DW under low CO2 to 18.4 nkat mg(-1) DW under high CO2, while APX activity did not change significantly. When exposed to natural CO2 concentration (380 ppm) in darkness, CP formation was significantly lower (18.2 %) compared to natural solar irradiation (41.3 %). In summary, CP formation and CAT activity are significantly increased under conditions that favour photorespiration, while in darkness or at high CO2 concentration under light, CP formation is significantly lower, providing evidence for an association between CPs and photorespiration.
机译：在植物中经常观察到叶绿体突起（CPs），但是它们对植物代谢的重要性仍然未知。如果CP的形成与光呼吸有关，我们研究了在各种CO2浓度下处理过的高山毛R（Ranunculus glacialis L.），特别是过氧化氢（H2O2）的代谢。暴露于不同的CO2浓度后，立即评估叶肉细胞中CP的形成并将其与过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）活性相关。在自然辐射下，暴露于低CO2（38 ppm）后具有突起的叶绿体的相对比例（r8.7）最高（58.7％），而在高CO2（10,000 ppm）时最低（3.0％）。发现CAT活性具有相同的关系，从低CO2下的34.7 nkat mg（-1）DW降低到高CO2下的18.4 nkat mg（-1）DW，而APX活性没有明显变化。当在黑暗中暴露于自然CO2浓度（380 ppm）时，与自然太阳辐射（41.3％）相比，CP的形成要低得多（18.2％）。总之，在有利于光呼吸的条件下，CP的形成和CAT活性显着增加，而在黑暗中或在光照下高CO2浓度下，CP的形成显着降低，为CP和光呼吸之间的联系提供了证据。

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