dc.contributor.author | Uscola Fernández, Mercedes | |
dc.contributor.author | Villar-Salvador, Pedro | |
dc.contributor.author | Oliet-Palá, Juan A | |
dc.contributor.author | Warren, Charles R. | |
dc.date.accessioned | 2023-12-26T16:55:33Z | |
dc.date.available | 2023-12-26T16:55:33Z | |
dc.date.issued | 2014-08 | |
dc.identifier.citation | Mercedes Uscola, Pedro Villar-Salvador, Juan Oliet, Charles R. Warren,2014, Foliar absorption and root translocation of nitrogen from different chemical forms in seedlings of two Mediterranean trees, Environmental and Experimental Botany, Volume 104,Pages 34-43 https://doi.org/10.1016/j.envexpbot.2014.03.004. | es |
dc.identifier.issn | 0098-8472 | |
dc.identifier.uri | https://hdl.handle.net/10115/27870 | |
dc.description | This study was supported by a FPU-MEC grant AP2007-01397 to M. Uscola, and by projects AGL2006-12609-C02-01/FOR (ENCINUT), AGL2011-24296 ECOLPIN (MICIIN), and the network REMEDINAL 2 (S2009/AMB/1783) of the Community of Madrid. Charles Warren is supported by a Future Fellowship from the Australian Research Council (Grant no. FT100100024). | es |
dc.description.abstract | Along with root uptake, plants can also absorb N through leaves. There are few comparative studies
on the foliar absorption of N from different chemical forms of N in forest tree species. We compared
the foliar N absorption capacity in seedlings of two forest trees widespread in the Mediterranean basin,
Quercus ilex and Pinus halepensis. Plants were sprayed with the following individual N forms at 40 mM
N: 15N-nitrate (NO3
−), 15N-ammonium (NH4
+), 15N-urea or 13C and 15N dual-labeled glycine. Cuticular
conductance was used as a surrogate of cuticle permeability to water. Q. ilex had higher N foliar absorption than P. hapelensis. Neither cuticular conductance nor shoot surface area explained N differences in
absorption rate between species, which were instead likely linked to differences in stomatal density and
presence of trichomes. In both species, foliar N absorption rate and N recovery differed among N forms:
urea > NH4
+ ≥ glycine ≥ NO3
−. Differences in N absorption rate among N forms were correlated with their
physico-chemical properties. The strong positive relationship between 15N and 13C uptake together with
detection in shoots of intact dual-labeled glycine (measured by gas chromatography–mass spectrometry), indicated that a significant fraction of glycine was absorbed intact by the seedlings. In both species,
higher cuticular conductance was related to faster N absorption from all forms except NO3
−. Cuticular
conductance had a stronger effect on N absorption from urea and NH4
+ than N absorption from glycine,
and the effects were more intense in Q. ilex than in P. halepensis. This suggests that variations in cuticle permeability in both species are determined by different mechanisms and that each N form was differently
affected. Absorbed N was rapidly translocated to roots, with a larger proportion of N from organic forms
being translocated than N from inorganic forms. Foliar fertilization increased plant N content, especially
in urea fertilized plants, but direct foliar absorption only explained up to 10% of N content increase. This
study demonstrates thattwo important Mediterranean foresttree species can absorb through their leaves
both, inorganic and organic N forms. This has important ecological and applied implications, because all
chemical forms of N are present in natural N deposition. Also results show that foliar N fertilization can
play an important role for seedling N nutrition, and that the effect will have different impacts depending
on the species. | es |
dc.language.iso | eng | es |
dc.publisher | Science Direct | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Ammonium-nitrate | es |
dc.subject | Cuticular conductance | es |
dc.subject | Glycine | es |
dc.subject | Pinus halepensis | es |
dc.subject | Quercus ilex | es |
dc.subject | Urea | es |
dc.title | Foliar absorption and root translocation of nitrogen from different chemical forms in seedlings of two Mediterranean trees | es |
dc.type | info:eu-repo/semantics/article | es |
dc.identifier.doi | 10.1016/j.envexpbot.2014.03.004. | es |
dc.rights.accessRights | info:eu-repo/semantics/restrictedAccess | es |