Regulation of nitrogen storage and mobilization in the annual life cycle of poplar

杨树生命周期中氮储存和动员的调控

• 批准号: 5398231
• 负责人: Professor Dr. Heinz Rennenberg
• 金额: --
• 依托单位: Professur für Baumphysiologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5398231?language=en
• 关键词: Regulation; nitrogen; storage; mobilization; annual

Nitrogen nutrition is a major growth limiting factor for trees and, therefore, nitrogen uptake and assimilation are highly regulated. Recently it was shown that beside reduced nitrogen compounds, e.g. glutamine, phytohormones such as cytokinins regulate nitrate uptake. The central aim of this project is to test the hypothesis that two antagonistic regulatory pathways are involved in the adaptation of N uptake by the roots to the N-demand of trees: (1) The enrichment of particular amino compounds serves as signal for the repression of nitrogen uptake and (2) the enrichment of cytokinins increases the expression of genes involved in nitrogen uptake and assimilation. A combination of molecular and physiological methods with computer modelling will be used to assess the regulation of N-metabolism by reduced N-compounds and cytokinins in poplar and their cycling within the plant.

氮素营养是树木生长的主要限制因素，因此，氮素吸收和同化受到高度调节。最近的研究表明，除了还原氮化合物，如谷氨酰胺，植物激素，如细胞分裂素调节硝酸盐的吸收。本项目的主要目的是检验两种拮抗调节途径参与根系对树木氮需求的适应的假设：（1）特定氨基化合物的富集作为抑制氮吸收的信号;（2）细胞分裂素的富集增加了参与氮吸收和同化的基因的表达。将分子和生理学方法与计算机模拟相结合，以评估氮代谢的调节，减少氮化合物和细胞分裂素在白杨和植物内的循环。