...
首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Oxidative stress induced in chloroplasts or mitochondria promotes proline accumulation in leaves of pea (Pisum sativum): another example of chloroplast-mitochondria interactions
【24h】

Oxidative stress induced in chloroplasts or mitochondria promotes proline accumulation in leaves of pea (Pisum sativum): another example of chloroplast-mitochondria interactions

机译:在叶绿体或线粒体中诱导的氧化应激促进豌豆叶中的脯氨酸积累:叶绿体 - 线粒体相互作用的另一个例子

获取原文
获取原文并翻译 | 示例
           

摘要

Oxidative stress can occur in different parts of plant cells. We employed two oxidants that induce reactive oxygen species (ROS) in different intracellular compartments: methyl viologen (MV, in chloroplasts) and menadione (MD, in mitochondria). The responses of pea (Pisum sativum) leaf discs to MV or MD after 4-h incubation in dark or moderate (300Em(-2)s(-1)) or high light (1200Em(-2)s(-1)) were examined. Marked increase in ROS levels was observed, irrespective of compartment targeted. The levels of proline, a compatible solute, increased markedly much more than that of ascorbate or glutathione during oxidative/photo-oxidative stress, emphasizing the importance of proline. Further, the activities and transcripts of enzymes involved in biosynthesis or oxidation of proline were studied. An upregulation of biosynthesis and downregulation of oxidation was the basis of proline accumulation. Pyrroline-5-carboxylate synthetase (P5CS, involved in biosynthesis) and proline dehydrogenase (PDH, involved in oxidation) were the key enzymes regulated under oxidative stress. Since these two enzymesP5CS and PDHare located in chloroplasts and mitochondria, respectively, we suggest that proline metabolism can help to mediate inter-organelle interactions and achieve redox homeostasis under photo-oxidative stress.
机译:氧化应激可以发生在植物细胞的不同部分。我们使用两种氧化剂,该氧化剂诱导不同的细胞内隔室中的活性氧(ROS):甲基Viologen(MV,叶绿体)和男女淋植物(MD,线粒体)。豌豆(Pisum sativum)叶片在暗或中等(300em(-2)s(-1))或高光(1200em(-2)(-1))中孵育后的mV或md的反应检查了。无论靶向舱室如何,都观察到ROS水平的显着增加。在氧化/光氧化应激期间,脯氨酸脯氨酸水平,相容性溶质,显着增加了大于抗坏血酸或谷胱甘肽的多大增加,强调脯氨酸的重要性。此外,研究了参与脯氨酸生物合成或氧化的酶的活性和转录物。生物合成的上调和氧化下调是脯氨酸积累的基础。吡咯啉-5-羧酸酯合成酶(参与生物合成的P5Cs)和脯氨酸脱氢酶(参与氧化的PDH)是在氧化应激下调节的关键酶。由于这两种酶和Pdhare分别位于叶绿体和线粒体中,我们表明脯氨酸代谢可以帮助介导细胞内相互作用,并在光氧化应激下实现氧化还原性稳态。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号