Regulation of oxygen diffusion in legume nodules
Regulation of oxygen diffusion in legume nodules
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DOI：
10.1016/s0038-0717(96)00204-0
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发表时间：
1997-05-01
影响因子：
9.7
通讯作者：
Minchin, FR
中科院分区：
文献类型：
--
作者：
Minchin, FR
本文综述了近年来豆科植物根瘤可变氧扩散屏障的结构和机制的研究进展。这些表明，屏障是一个复杂的结构，涉及中间皮层的细胞间空间闭塞和内皮层的可收缩反应。感染区域内也可能发生几种代谢或结构变化。试图将这些不同的层整合在一个时间框架内。还假设该框架通过使用活性氧物质，特别是H2 O2的增强生产来整合，所述活性氧物质充当扩散屏障的传感器和信号。最后，利用O-2扩散调节的潜力被认为是在低O-2条件下的基因表达的要求，在压力条件下的O-2供应的控制和使用的O-2屏障的宿主植物调节N-2固定活性。(C)1997 Elsevier Science Ltd.
A review is presented of advances recently made in studies on the structure and mechanisms of the variable O-2 diffusion barrier of legume nodules. These suggest that the barrier is a complex of structures involving intercellular space occlusions in the mid-cortex and osmocontractile responses in the inner cortex. There are also several metabolic or structural changes which could occur within the infected region. An attempt is made to integrate these various layers within a temporal framework. It is also hypothesised that this framework is integrated through the use of enhanced production of activated oxygen species, particularly H2O2, which act as sensors and signals for the diffusion barrier. Finally, the potential for exploiting the regulation of O-2 diffusion is considered in terms of the requirements for low O-2 conditions for gene expression, the control of O-2 supply under stress conditions and the use of the O-2 barrier by the host plant to regulate N-2 fixation activity. (C) 1997 Elsevier Science Ltd.