Signaling mechanisms integrating root and shoot responses to changes in the nitrogen supply

被引:78
作者
Walch-Liu, P
Filleur, S
Gan, YB
Forde, BG [1 ]
机构
[1] Univ Lancaster, Dept Biol Sci, Lancaster LA1 4YQ, England
[2] Univ York, Ctr Novel Agr Prod, York YO10 5DD, N Yorkshire, England
基金
英国生物技术与生命科学研究理事会;
关键词
abscisic acid; auxin; cytokinin; leaf expansion; nitrate; nodulation; root development; shoot : root ratio;
D O I
10.1007/s11120-004-2080-9
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
During their life cycle, plants must be able to adapt to wide variations in the supply of soil nitrogen (N). Changes in N availability, and in the relative concentrations of NO3- and NH4+, are known to have profound regulatory effects on the N uptake systems in the root, on C and N metabolism throughout the plant, and on root and shoot morphology. Optimising the plant's responses to fluctuations in the N supply requires co-ordination of the pathways of C and N assimilation, as well as establishment of the appropriate allocation of resources between root and shoot growth. Achieving this integration of responses at the whole plant level implies long-distance signaling mechanisms that can communicate information about the current availability of N from root-to-shoot, and information about the C/N status of the shoot in the reverse direction. In this review we will discuss recent advances which have contributed to our understanding of these long-range signaling pathways.
引用
收藏
页码:239 / 250
页数:12
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