Enhancing the phytotechnologies toolkit : from pollutant prioritization to assessing the water relations of Populus L. genotypes grown for phytoremediation
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Phytoremediation is a cost-effective technology that has been gaining momentum over the past few decades as a sustainable option for environmental pollution remediation. However, challenges remain to the optimization of phytoremediation systems, including: 1) selecting which pollutants to target with remediation systems, and 2) selecting ideal tree genotypes that both fulfill remediation objectives and are resilient to variable climatic conditions. To address the first challenge, an approach was developed for toxicity-based prioritization of contaminants to target with remediation systems. The comprehensive approach was then applied to a case study of Wisconsin landfills, wherein it was augmented with non-targeted analysis of high-resolution mass spectrometry data for putative identification of candidate compounds in landfill samples. To address the second challenge, a meta-analysis of Populus water use reported in the literature was conducted, and its influential factors were identified and compared. Then, a field trial was conducted to investigate the water use strategies of three hybrid poplar genotypes ('DN34', Populus deltoides Bartr. ex. Marsh x P. nigra L.; '9732-11', P. deltoides x P. nigra; 'NM2', P. nigra x P. maximowiczii A. Henry) in their fourth growing season that were grown for phytoremediation at a waste dumping site in Wisconsin. The approaches and results presented here can enable standardized pollutant prioritization and inform the selection of resilient poplar genotypes for phytoremediation applications.
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Ph. D