NDLI: The role of root nitrate reduction in the systemic control of biomass partitioning between leaves and roots in accordance to the C/N-status of tobacco plants

Content Provider	Springer Nature Link
Author	Kruse, Jörg Hänsch, Robert Mendel, Ralf R. Rennenberg, Heinz
Copyright Year	2010
Abstract	The root/shoot-ratio is a simple parameter to describe the systemic response of plants to alterations of their nutritional status, as indicated by the C/N-balance of leaves. The ‘functional equilibrium hypothesis’ holds that leaf growth is limited by the supply of nitrogen from the roots, whereas root growth depends on the carbon supply from leaves. The nature of the systemic control that balances root and shoot growth is not fully understood. Previous experiments have shown that root growth of transformed tobacco plants, which lack functional root nitrate reductase, was severely impeded, when plants were grown on NO3− as the sole N-source. In these experiments, the root/shoot-ratio was correlated with the Glutamate/Glutamine-ratio of roots. In the present study we tested the hypothesis that high internal Glu contents (in relation to Gln) inhibit root growth. Wild type and transformed tobacco plants were given access to both NH$_{4}$ and NO$_{3}$, and were cultivated at ambient and elevated pCO$_{2}$ in order to vary carbon availability. The uptake and assimilation of NH4+ by the root was significantly higher in transformed than in wild type tobacco, in particular at elevated pCO$_{2}$. Consequently, the Glu/Gln-ratio in the root of transformants was significantly lower than in NO3− -grown plants, and was, in the present study, not different from the wild type. However, we failed to observe a correlation between plant architecture and the Glu/Gln-ratio of roots, suggesting that signals arising from the immediate products of nitrate reduction (nitrite) are involved in the systemic control of root growth. Furthermore the synthesis of root-derived signals, which affect N-turnover, starch re-mobilization and the growth of leaves, appears to be associated with root nitrate reduction. This enzymatic step seems to be indispensable for the systemic control of biomass partitioning, and plays a crucial role for the integration of carbon and nitrogen metabolism at the whole plant level.
Starting Page	387
Ending Page	403
Page Count	17
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	332
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Systemic control C/N-balance Root: shoot ratio Nitrate reduction Ammonium assimilation Glutamate signalling Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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