Assessment of Bur oak (Quercus macrocarpa) and Red Oak (Quercus rubra) for salinity tolerance and propagation through semi-hardwood cuttings

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dc.contributor.authorSimranjit Singh
dc.contributor.examiningcommitteeDaayf, Fouad (Plant Science) Ronald, Philip (Riverbend Orchards Inc. Portage la Prairie, MB, Canada)en_US
dc.contributor.supervisorStasolla, Claudio (Plant Science)en_US
dc.date.accessioned2017-01-06T20:11:54Z
dc.date.available2017-01-06T20:11:54Z
dc.date.issued2016-03-30en_US
dc.degree.disciplinePlant Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractGrowth performance of Bur oak (Q. macrocarpa Michx.) and Red oak (Q. rubra L.) under salinity conditions was assessed by growing seedlings in the presence of increasing levels of NaCl. Salinity reduced root growth in both species, although its repressive effect was more pronounced in Red oak. Exposure to 75 mM NaCl for three weeks almost arrested root growth in Red oak, while it reduced it only by 40 % in Bur oak. Red oak roots showed extensive necrosis and limited branching. Salinity also induced leaf injury, which at a NaCl level of 25 mM was less severe in Bur oak possibly due the higher expression of dehydroascorbate reductase (DHAR) and ascorbate peroxidase (APX), enzymes participating in the detoxification of reactive oxygen species (ROS). Salinity also altered nutrient uptake and accumulation in root and leaf tissue. Compared to Red oak, the relative calcium level in Bur oak roots exposed to increased salinity remained elevated, while an opposite trend was observed in leaf tissue. This was in contrast to nitrogen and potassium, the relative level of which was higher in Red oak leaves grown in the presence of NaCl. The better performance of Bur oak root tissue under salinity conditions was ascribed to structural modifications of the root system with maturation of casparian bands and suberinization occurring closer to the root tip. These structures are known to act as barriers enhancing ion selectivity. Collectively this study demonstrates that relative to Red oak, Bur oak is more tolerant to NaCl induced salinity conditions.en_US
dc.description.noteFebruary 2017en_US
dc.identifier.citationSingh, S., & Stasolla, C. (2016). Response of Bur and Red oak seedlings to NaCl-induced salinity. Acta Physiologiae Plantarum, 38(4), 1-12.en_US
dc.identifier.urihttp://hdl.handle.net/1993/31994
dc.language.isoengen_US
dc.publisherSpringer (Acta Physiologiae Plantarum)en_US
dc.rightsopen accessen_US
dc.subjectBur oaken_US
dc.subjectRed Oaken_US
dc.subjectSalinityen_US
dc.subjectSalt stressen_US
dc.subjectRoot pruningen_US
dc.subjectSemi-hardwood cuttingsen_US
dc.subjectQuercus macrocarpaen_US
dc.subjectQuercus rubraen_US
dc.subjectDe-icing salten_US
dc.subjectAntioxidant enzymesen_US
dc.subjectHydroponicsen_US
dc.subjectRoot histologyen_US
dc.subjectCasparian bandsen_US
dc.titleAssessment of Bur oak (Quercus macrocarpa) and Red Oak (Quercus rubra) for salinity tolerance and propagation through semi-hardwood cuttingsen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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