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| DOI: | 10.1016/j.envexpbot.2011.07.009 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0098847211001729
Last checked: 04/12/2012
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Gonzalez-Dugo, V.;
Durand, J. L.;
Gastal, F.;
Bariac, T.;
Poincheval, J. |
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| Author Affiliation: | Gonzalez-Dugo: Instituto de Agricultura Sostenible - CSIC, Alameda del Obispo, Córdoba, Spain; Durand, Gastal and Poincheval: Unité de Recherche Pluridisciplinaire Prairies et Plantes Fourragères, INRA, Lusignan, France; Bariac: Université Pierre-et-Marie-Curie-CNRS-INRA, Centre de recherche INRA-INA PG, Thiverval-Grignon, France |
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| Title: | Restricted root-to-shoot translocation and decreased sink size are responsible for limited nitrogen uptake in three grass species under water deficit |
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| Source: | Environmental and Experimental Botany. Vol. 75, January 2012, p. 258-267. |
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| Publishing Information: | Elsevier |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Dactylis glomerata; Drought stress; Festuca arundinacea; Growth analysis; Lolium multiflorum; Nitrogen deficiency; Nitrogen level; Nutrient transport; Physiological functions; Polyethylene glycol; Soil water deficit
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| Abstract/Contents: | "Earlier studies showed that water deficit reduces nitrogen (N) uptake and N nutrition index of grasses. So far, the main effect of water deficit on N uptake and N nutrition status was ascribed to the alteration of the transpiration-dependent transport of mineral N in the soil solution. A split-root experiment was performed to determine whether plant and/or solution water potential could alter N uptake and allocation, independently of N fluxes in the soil solution. The split-root experiment allowed to manipulate separately the water and the N status of the root environment and of the plant, by various combinations of addition of polyethylene glycol 6000 (PEG) and mineral N on half or on the entire root system. Tall fescue, Italian ryegrass and cocksfoot, known for their contrasted sensitivities to water deficit, were studied. The addition of PEG largely reduced water and N uptake of the roots on which it was applied (half or entire root system). A significant accumulation of N was observed on the roots to which PEG was added, particularly in cocksfoot and tall fescue, hypothetically contributing to the alteration of N uptake. Cocksfoot displayed a high plasticity in N allocation to leaves related to sheaths, allowing the maintenance of N concentration and therefore its N status despite the reduction in N uptake. By contrast, leaf N concentration and N status of tall fescue and Italian ryegrass was more sensitive to water deficit, similarly to observations of the effect of drought in field studies. Therefore, it is concluded that the effect of soil solution potential on N uptake and plant N allocation may also contribute to the observed effect of drought on N status of grass crops, additionally to the effect of drought on the transfer of mineral N in the soil solution to the root surface. However, the importance of this physiological effect varies among species." |
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| Language: | English |
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| References: | 35 |
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| See Also: | Other items relating to: Breeding for Drought |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gonzalez-Dugo, V., J. L. Durand, F. Gastal, T. Bariac, and J. Poincheval. 2012. Restricted root-to-shoot translocation and decreased sink size are responsible for limited nitrogen uptake in three grass species under water deficit. Environ. Exp. Bot. 75:p. 258-267. |
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| DOI: 10.1016/j.envexpbot.2011.07.009 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0098847211001729
Last checked: 04/12/2012
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: b4885055 |
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