Markers and signals associated with nitrogen assimilation in higher plants
Markers and signals associated with nitrogen assimilation in higher plants
复制标题
DOI：
10.1093/jxb/erg053
复制
发表时间：
2003-01-01
影响因子：
6.9
通讯作者：
Noctor, G
中科院分区：
文献类型：
--
作者：
Foyer, CH;Parry, M;Noctor, G
植物中碳/氮（C/N）相互作用的一个关键概念是，氮同化的能力是通过对激素、硝酸盐、糖、有机酸和氨基酸信号的综合感知来与养分的可用性和需求相一致的。在过去的十年里，对这些信号的性质和整合的研究揭示了一个由C和N信号相互作用所促成的复杂的控制网络。这些控制不仅协调C和N同化以及碳水化合物和氨基酸生产的相对速率，而且对植物发育也有重要影响。氨基酸是氮同化、相关的碳代谢、光呼吸、从叶片输出有机氮和合成含氮终产物的过程的中心。由于特定的主要氨基酸或其相对比例调制差异光呼吸和N同化，即使这些过程是紧密交织的，它们是潜在的强大的标记物的代谢物分析和代谢组学方法的植物生物学研究。此外，虽然次要氨基酸显示出明显的昼夜节律，其内容波动协调的方式。这是可能的因素与早期事件和过程中的C和N同化影响的相对组成的次要氨基酸。
A key concept underpinning current understanding of the carbon/nitrogen (C/N) interaction in plants is that the capacity for N assimilation is aligned to nutrient availability and requirements by the integrated perception of signals from hormones, nitrate, sugars, organic acids, and amino acids. Studies on the nature and integration of these signals over the last ten years has revealed a complex network of controls brokered by an interplay of C and N signals. These controls not only act to orchestrate the relative rates of C and N assimilation and carbohydrate and amino acid production, but they also have a significant influence on plant development. Amino acids are the hub around which the processes of N assimilation, associated C metabolism, photorespiration, export of organic N from the leaf, and the synthesis of nitrogenous end-products revolve. Since specific major amino acids or their relative ratios are modulated differentially by photorespiration and N assimilation, even though these processes are tightly intermeshed, they are potentially powerful markers for metabolite profiling and metabolomics approaches to the study of plant biology. Moreover, while minor amino acids show marked diurnal rhythms, their contents fluctuate in a co-ordinated manner. It is probable that factors associated with early events and processes in C and N assimilation influence the relative composition of minor amino acids.