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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.supervisor Stasolla, Claudio (Plant Science) en_US
dc.contributor.author Simranjit Singh
dc.date.accessioned 2017-01-06T20:11:54Z
dc.date.available 2017-01-06T20:11:54Z
dc.date.issued 2016-03-30 en_US
dc.identifier.citation Singh, 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.uri http://hdl.handle.net/1993/31994
dc.description.abstract Growth 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.publisher Springer (Acta Physiologiae Plantarum) en_US
dc.subject Bur oak en_US
dc.subject Red Oak en_US
dc.subject Salinity en_US
dc.subject Salt stress en_US
dc.subject Root pruning en_US
dc.subject Semi-hardwood cuttings en_US
dc.subject Quercus macrocarpa en_US
dc.subject Quercus rubra en_US
dc.subject De-icing salt en_US
dc.subject Antioxidant enzymes en_US
dc.subject Hydroponics en_US
dc.subject Root histology en_US
dc.subject Casparian bands en_US
dc.title Assessment of Bur oak (Quercus macrocarpa) and Red Oak (Quercus rubra) for salinity tolerance and propagation through semi-hardwood cuttings en_US
dc.degree.discipline Plant Science en_US
dc.contributor.examiningcommittee Daayf, Fouad (Plant Science) Ronald, Philip (Riverbend Orchards Inc. Portage la Prairie, MB, Canada) en_US
dc.degree.level Master of Science (M.Sc.) en_US
dc.description.note February 2017 en_US


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