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dc.contributor.advisorFritschi, Felix B., 1969-eng
dc.contributor.authorNaylor, Bretteng
dc.date.issued2016eng
dc.date.submitted2016 Springeng
dc.description.abstract[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Drought is a huge concern for soybean growers across the world, and in the Midwestern US is the main limitation to grain yield. A way to protect against drought stress is for plants to use water more efficiently. Carbon isotope discrimination (CID) is a measured trait that is related to water-use efficiency (WUE), and can be used to screen genotypes for higher WUE. Several genotypes were studied in multiple greenhouse and field experiments with varying drought stress treatments. Genotypes exhibiting less CID were shown to have a higher WUE, and CID was related to WUE. The higher WUE genotypes also exhibited differences in photosynthetic traits, especially in their stomatal behavior to restrict water loss. In terms of grain yield, very few differences were observed between the genotypes. Thermal images to estimate canopy temperature and sap flow sensors to estimate field water use provided excellent insight into differences among watering treatments and genotypes for transpiration rates. This research demonstrates, that in soybean, CID can be used as a screening tool to select for higher WUE, and higher WUE is likely a result of increased stomatal restrictions to prevent water loss during periods of drought stress. However, these genotypes exhibiting less transpiration showed minimal, if any grain yield reduction. Further, whole field imaging can also be utilized to identify higher WUE genotypes, and sap flow sensors can be expected to estimate water use in the field. Both resulting in reduced labor and more efficient time use.eng
dc.identifier.urihttps://hdl.handle.net/10355/60389
dc.identifier.urihttps://doi.org/10.32469/10355/60389eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsAccess to files is limited to the University of Missouri--Columbia.eng
dc.titleWater-use efficiency, photosynthetic characteristics, and high through-put phenotyping methods for soybean (glycine max) genotypes contrasting in carbon isotope discriminationeng
dc.typeThesiseng
thesis.degree.disciplinePlant sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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