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dc.contributor.author Louahlia, S.
dc.contributor.author Laine, P.
dc.contributor.author Macduff, J. H.
dc.contributor.author Ourry, A.
dc.contributor.author Humphreys, M. O.
dc.contributor.author Boucaud, J.
dc.date.accessioned 2009-05-21T12:24:38Z
dc.date.available 2009-05-21T12:24:38Z
dc.date.issued 2008
dc.identifier.citation Louahlia , S , Laine , P , Macduff , J H , Ourry , A , Humphreys , M O & Boucaud , J 2008 , ' Interactions between reserve mobilization and regulation of nitrate uptake during regrowth of Lolium perenne L.: putative roles of amino acids and carbohydrates ' Botany , vol 86 , no. 10 , pp. 1101-1110 . , 10.1139/B08-066 en
dc.identifier.issn 1916-2790
dc.identifier.other PURE: 102860
dc.identifier.other dspace: 2160/2327
dc.identifier.uri http://hdl.handle.net/2160/2327
dc.description Louahlia, S., Laine, P., Macduff, J. H., Ourry, A., Humphreys, M. O., Boucaud, J. (2008). Interactions between reserve mobilization and regulation of nitrate uptake during regrowth of Lolium perenne L.: putative roles of amino acids and carbohydrates.  Canadian Journal of Botany, 86, (10), 1101-1110. (now Botany) IMPF: 01.08 RONO: 1310 3001 en
dc.description.abstract In most forage grass and legume species the recovery of leaf growth following severe defoliation depends on mobilization of carbon and nitrogen reserves from the remaining tissues. Unusually, Lolium perenne L. is able to compensate for low levels of available N storage compounds by rapid up-regulation of mineral N uptake. To investigate the physiological basis of this behaviour, perennial ryegrass plants were exposed to a 10 ?d period of optimal mineral N (high-N plants) or zero N (low-N plants) supply before defoliation. N deprivation decreased total N and amino acid concentrations in roots, and increased root water soluble carbohydrate concentrations. Compared with high-N plants (control), fructans and fructose concentrations in roots of low-N plants were 74% and 49% higher, respectively. Low-N plants had higher rates of nitrate uptake following defoliation, and lower amino acid concentrations in the roots (mainly as asparagine and glutamine); a causal role was suggested by the inhibition of nitrate uptake by external root supply of amino acids to low-N plants or by a stimulation of N uptake of high-N plants by sucrose supply to the roots. The results suggest that down-regulation of nitrate uptake following defoliation of plants with high levels of N reserves, may be effected through an increased cycling of amino acids within the plant and by a shortage of carbohydrates. Results are discussed in relation to the proteolytic activities and mobilization of C and N reserves to leaf meristem. en
dc.format.extent 10 en
dc.language.iso eng
dc.relation.ispartof Botany en
dc.subject defoliation, Poacea, Lolium perenne, nitrate, N uptake, amino acids en
dc.title Interactions between reserve mobilization and regulation of nitrate uptake during regrowth of Lolium perenne L.: putative roles of amino acids and carbohydrates en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1139/B08-066
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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