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Plant d<SUP>15</SUP>N correlates with the transpiration efficiency of nitrogen acquisition in tropical trees

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dc.contributor.author Cernusak, Lucas A. en
dc.contributor.author Winter, Klaus en
dc.contributor.author Turner, Benjamin L. en
dc.date.accessioned 2011-02-09T20:01:55Z
dc.date.available 2011-02-09T20:01:55Z
dc.date.issued 2009
dc.identifier.citation Cernusak, Lucas A., Winter, Klaus, and Turner, Benjamin L. 2009. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F11809">Plant d15N correlates with the transpiration efficiency of nitrogen acquisition in tropical trees</a>." <em>Plant Physiology</em>. 151:1667&ndash;1676. en
dc.identifier.issn 0032-0889
dc.identifier.uri http://hdl.handle.net/10088/11809
dc.description.abstract Based upon considerations of a theoretical model of 15N/14N fractionation during steady-state nitrate uptake from soil (Comstock 2001, Planta 214:220-234), we hypothesized that, for plants grown in a common soil environment, whole plant {delta}15N ({delta}P) should vary as a function of the transpiration efficiency of nitrogen acquisition (FN/v) and the difference between whole-plant {delta}15N and root {delta}15N ({delta}P-{delta}R). We tested these hypotheses with measurements of several tropical tree and liana species. Consistent with theoretical expectations, both FN/v and {delta}P-{delta}R were significant sources of variation in {delta}P, and the relationship between {delta}P and FN/v differed between non-N2-fixing and N2-fixing species. We interpret the correlation between {delta}P and FN/v as resulting from variation in mineral nitrogen efflux to influx ratios across plasma membranes of root cells. These results provide a simple explanation of variation in {delta}15N of terrestrial plants, and have implications for understanding nitrogen cycling in ecosystems. en
dc.relation.ispartof Plant Physiology en
dc.title Plant d<SUP>15</SUP>N correlates with the transpiration efficiency of nitrogen acquisition in tropical trees en
dc.type Journal Article en
dc.identifier.srbnumber 79995
rft.jtitle Plant Physiology
rft.volume 151
rft.spage 1667
rft.epage 1676
dc.description.SIUnit STRI en
dc.citation.spage 1667
dc.citation.epage 1676


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