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Depletion of carboh...
Depletion of carbohydrate reserves limits nitrate uptake during early regrowth in Lolium perenne L.
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Guo, Qianqian (författare)
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Turnbull, Matthew Hamish (författare)
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Song, Jiancheng (författare)
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Roche, Jessica (författare)
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- Novak, Ondrej (författare)
- Palacký University Olomouc
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- Späth, Jana (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Kemiska institutionen,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology,Umeå University
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Jameson, Paula Elizabeth (författare)
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- Love, Jonathan (författare)
- University of Canterbury
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(creator_code:org_t)
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- 2017-03-31
- 2017
- Engelska.
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Ingår i: Journal of Experimental Botany. - : Oxford University Press. - 0022-0957 .- 1460-2431. ; 68:7, s. 1569-1583
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Nyckelord
- Carbohydrate
- carbon
- cytokinin
- fructan
- Lolium perenne
- nitrate transporter (NRT)
- nitrate uptake
- nitrogen
- nitrogen use efficiency (NUE)
- perennial ryegrass
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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