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Depletion of carbohydrate reserves limits nitrate uptake during early regrowth in Lolium perenne L.
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2017 (English)In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431, Vol. 68, no 7, p. 1569-1583Article in journal (Refereed) Published
Abstract [en]

The mechanisms linking C/N balance to N uptake and assimilation are central to plant responses to changing soil nutrient levels. Defoliation and subsequent regrowth of grasses both impact C partitioning, thereby creating a significant point of interaction with soil N availability. Using defoliation as an experimental treatment, we investigated the dynamic relationships between plant carbohydrate status and NO3--responsive uptake systems, transporter gene expression, and nitrate assimilation in Lolium perenne L. High- and low-affinity NO3- uptake was reduced in an N-dependent manner in response to a rapid and large shift in carbohydrate remobilization triggered by defoliation. This reduction in NO3- uptake was rescued by an exogenous glucose supplement, confirming the carbohydrate dependence of NO3- uptake. The regulation of NO3- uptake in response to the perturbation of the plant C/N ratio was associated with changes in expression of putative high- and low-affinity NO3- transporters. Furthermore, NO3- assimilation appears to be regulated by the C-N status of the plant, implying a mechanism that signals the availability of C metabolites for NO3- uptake and assimilation at the whole-plant level. We also show that cytokinins may be involved in the regulation of N acquisition and assimilation in response to the changing plant C/N ratio.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 68, no 7, p. 1569-1583
Keywords [en]
Carbohydrate, carbon, cytokinin, fructan, Lolium perenne, nitrate transporter (NRT), nitrate uptake, nitrogen, nitrogen use efficiency (NUE), perennial ryegrass
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-139582DOI: 10.1093/jxb/erx056ISI: 000400341800017PubMedID: 28379423OAI: oai:DiVA.org:umu-139582DiVA, id: diva2:1143413
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2018-06-09Bibliographically approved

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Späth, Jana

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