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Coordinated nitrogen and carbon remobilization for nitrate assimilation in leaf, sheath and root and associated cytokinin signals during early regrowth of Lolium perenne
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2017 (English)In: Annals of Botany, ISSN 0305-7364, E-ISSN 1095-8290, Vol. 119, no 8, p. 1353-1364Article in journal (Refereed) Published
Abstract [en]

Background and Aims The efficiency of N assimilation in response to defoliation is a critical component of plant regrowth and forage production. The aim of this research was to test the effect of the internal C/N balance on NO3- assimilation and to estimate the associated cytokinin signals following defoliation of perennial ryegrass (Lolium perenne L. 'Grasslands Nui') plants. Methods Plants, manipulated to have contrasting internal N content and contrasting availability of water soluble carbohydrates (WSCs), were obtained by exposure to either continuous light or short days (8: 16 h light-dark), and watered with modified N-free Hoagland medium containing either high (5 mM) or low (50 mu M) NO3- as sole N source. Half of the plants were defoliated and the root, sheath and leaf tissue were harvested at 8, 24 and 168 h after cutting. The spatiotemporal changes in WSCs, synthesis of amino acids and associated cytokinin content were recorded after cutting. Key Results Leaf regrowth following defoliation involved changes in the low-and high-molecular weight WSCs. The extent of the changes and the partitioning of the WSC following defoliation were dependant on the initial WSC levels and the C and N availability. Cytokinin levels varied in the sheath and root as early as 8 h following defoliation and preceded an overall increase in amino acids at 24 h. Subsequently, negative feedback brought the amino acid response back towards pre-defoliation levels within 168 h after cutting, a response that was under control of the C/N ratio. Conclusions WSC remobilization in the leaf is coordinated with N availability to the root, potentially via a systemic cytokinin signal, leading to efficient N assimilation in the leaf and the sheath tissues and to early leaf regrowth following defoliation.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 119, no 8, p. 1353-1364
Keywords [en]
Nitrogen, nitrate, water-soluble carbohydrates, assimilation, cytokinin, Lolium perenne, defoliation, regrowth
National Category
Botany Forest Science
Identifiers
URN: urn:nbn:se:umu:diva-140242DOI: 10.1093/aob/mcx014ISI: 000404030500013PubMedID: 28334245OAI: oai:DiVA.org:umu-140242DiVA, id: diva2:1150739
Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2018-06-09Bibliographically approved

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Späth, Jana

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