Lodging-related traits in wheat in response to nitrogen fertilization and alteration of gibberellin level

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dc.contributor.authorKaur, Gurnoor
dc.contributor.examiningcommitteeCattani, Doug (Plant Science)
dc.contributor.examiningcommitteeHausner, Georg (Microbiology)
dc.contributor.supervisorAyele, Belay
dc.date.accessioned2025-03-04T14:38:40Z
dc.date.available2025-03-04T14:38:40Z
dc.date.issued2025-02-07
dc.date.submitted2025-02-07T20:06:22Zen_US
dc.date.submitted2025-03-03T16:34:55Zen_US
dc.degree.disciplinePlant Science
dc.degree.levelMaster of Science (M.Sc.)
dc.description.abstractWheat production is limited by numerous factors, including lodging, which refers to permanent displacement of a plant from its upright position due to falling over of the plant or breakage of its stem. The incidence of lodging is determined by genetic factors such as those that regulate gibberellin (GA) metabolism and thereby plant morphological traits, environmental factors such as heavy wind and rain, and crop management practices including nitrogen (N) fertilization. The present study investigated lodging-related morphological traits, which includes plant height, bending moment, internode breaking strength and lodging index, in response to varying N fertilization rates as well as treatment of plants with a plant growth regulator (PGR) that inhibits GA biosynthesis using two spring wheat cultivars with contrasting plant height. The findings of this thesis project indicated that high N fertilization rates increase plant height, bending moment and lodging index in both cultivars. Moreover, the taller cultivar exhibited higher bending moment and lodging index in response to nitrogen than the shorter cultivar. To gain insights into the molecular basis regulating GA metabolism and lodging-related morphological traits, the expression patterns of GA biosynthetic and catabolism genes were examined in the second basal internodes, which revealed differential expression patterns of these genes in response to varying N rates in both cultivars. Consistently, treatment of the tall cultivar plants with the PGR led to the reduction of plant height, which was associated with reductions in bending moment and lodging index.
dc.description.noteMay 2025
dc.identifier.urihttp://hdl.handle.net/1993/38896
dc.language.isoeng
dc.subjectLodging
dc.subjectNitrogen fertilization
dc.subjectGibberellin
dc.subjectPlant growth regulators
dc.titleLodging-related traits in wheat in response to nitrogen fertilization and alteration of gibberellin level
local.subject.manitobano
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