...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Botany >Mitochondrial respiration in ME-CAM, PEPCK-CAM, and C3 succulents: comparative operation of the cytochrome, alternative, and rotenone-resistant pathways
【24h】

Mitochondrial respiration in ME-CAM, PEPCK-CAM, and C3 succulents: comparative operation of the cytochrome, alternative, and rotenone-resistant pathways

机译：ME-CAM，PEPCK-CAM和C 3 多肉植物的线粒体呼吸作用：细胞色素，替代途径和鱼藤酮抗性途径的比较操作

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Mitochondria are important in the function and control of Crassulacean acid metabolism (CAM) during organic acid accumulation at night and acid decarboxylation in the day. In plants of the malic enzyme-(ME) type and the phosphoenolpyruvate carboxykinase- (PEPCK) type, mitochondria may exert their role in the control of the diurnal rhythm of malic and citric acids to a differential degree. In plants of both CAM types, the oxidative capacity of mitochondria, as well as the activity of CAM-linked mitochondrial enzymes, and of the alternative and the rotenone-resistant pathways of substrate oxidation were compared. Furthermore, a C3 succulent was included, as well as both C3 and CAM forms of Mesembryanthemum crystallinum during a salt-induced C3-to-CAM shift. Mitochondria of PEPCK-type CAM plants exhibited a lower activity of malate oxidation, ratio of malate to succinate oxidation, and activity of mitochondrial NAD-ME. With the exception of Kalanchoë daigremontiana, leaf mitochondria of all other CAM species were highly sensitive to cyanide (80–100%), irrespective of the oxidant used. This indicates that the alternative oxidase is not of general importance in CAM. By contrast, rotenone-insensitive substrate oxidation was very high (50–90%) in all CAM species. This is the first comparison of the rotenone-insensitive pathway of respiration in plants with different CAM-types. The results of this study confirm that mitochondria are involved in the control of CAM to different degrees in the two CAM types, and they highlight the multiple roles of mitochondria in CAM.
机译：线粒体在夜间有机酸积累和白天酸脱羧过程中对Crassulacean酸代谢（CAM）的功能和控制很重要。在苹果酸酶（ME）型和磷酸烯醇丙酮酸羧激酶（PEPCK）型植物中，线粒体可能在不同程度上控制苹果酸和柠檬酸的昼夜节律。在两种CAM类型的植物中，比较了线粒体的氧化能力以及CAM连接的线粒体酶的活性，以及​​底物氧化的替代途径和鱼藤酮抗性途径。此外，还包括C 3 多肉植物，以及盐诱导的C 3 -期间结晶膜的C 3 和CAM形式。到CAM转换。 PEPCK型CAM植物的线粒体显示出较低的苹果酸氧化活性，苹果酸与琥珀酸的氧化比例以及线粒体NAD-ME的活性。除Kalanchoëdaigremontiana外，所有其他CAM种类的叶线粒体均对氰化物高度敏感（80–100％），而与所使用的氧化剂无关。这表明替代氧化酶在CAM中并不普遍。相比之下，在所有CAM物种中，鱼藤酮不敏感的底物氧化率都很高（50–90％）。这是对具有不同CAM类型的植物中鱼藤酮不敏感的呼吸途径的首次比较。这项研究的结果证实，线粒体在两种CAM类型中均不同程度地参与CAM的控制，它们突显了线粒体在CAM中的多种作用。

著录项

相似文献

  • 外文文献
  • 中文文献
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