Influence of Nitrogen and Sink Competition on Shoot Growth of Poplar

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dc.contributor.advisorColeman, Gary Den_US
dc.contributor.authorEgekwu, Chiomaen_US
dc.contributor.departmentPlant Science and Landscape Architecture (PSLA)en_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2016-06-22T06:11:27Z
dc.date.available2016-06-22T06:11:27Z
dc.date.issued2016en_US
dc.description.abstractTerrestrial and oceanic biomass carbon sinks help reduce anthropogenic CO2 emissions and mitigate the long-term effect of increasing atmospheric CO2. Woody plants have large carbon pools because of their long residence time, however N availability can negatively impact tree responses to elevated CO2. Seasonal cycling of internal N in trees is a component that contributes to fitness especially in N limited environments. It involves resorption from senescing leaves of deciduous trees and storage as vegetative storage proteins (VSP) in perennial organs. Populus is a model organism for tree biology that efficiently recycles N. Bark storage proteins (BSP) are the most abundant VSP that serves as seasonal N reserves. Here I show how poplar growth is influenced by N availability and how growth is influenced by shoot competition for stored N reserves. I also provide data that indicates that auxin mediates BSP catabolism during renewed shoot growth. Understanding the components of N accumulation, remobilization and utilization can provide insights leading to increasing N use efficiency (NUE) of perennial plants.en_US
dc.identifierhttps://doi.org/10.13016/M2CR3S
dc.identifier.urihttp://hdl.handle.net/1903/18366
dc.language.isoenen_US
dc.subject.pqcontrolledPlant sciencesen_US
dc.subject.pquncontrolledauxinen_US
dc.subject.pquncontrolledBark storage proteins (BSP)en_US
dc.subject.pquncontrolledNitrogenen_US
dc.subject.pquncontrolledNutrient recycling of perennialsen_US
dc.subject.pquncontrolledPoplaren_US
dc.subject.pquncontrolledRenewed shoot growthen_US
dc.titleInfluence of Nitrogen and Sink Competition on Shoot Growth of Poplaren_US
dc.typeThesisen_US

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