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      • HARVEST
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      Evaluating the Competitive Abiliy of Semi-leafless Field Pea (Pisum sativum L.)

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      Date
      2015-06-16
      Author
      Jacob, Cory
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Field pea (Pisum sativum L.) is an important grain legume in western Canada. Growers can, however, be reluctant to include pulse crops such as field pea in their rotation because they are poor competitors with weeds. This thesis research was conducted to determine whether competitive differences exist among semi-leafless field pea cultivars and to determine the mechanism(s) driving competitive differences. Cultivars included in the studies were chosen on the basis of varying seed size and vine length, which are traits known to confer competitive ability. Differences in competitive ability were identified among cultivars as yield loss ranged from 9% to 31% and 14% to 31% for model weed seed return. However, cultivars were inconsistent in their competitive ranking as cultivars typically performed well for one metric, but not both. None of the traits measured in this study correlated with competitive ability. The greenhouse research was unable to identify the mechanism responsible for these competitive differences. Focal pea plants generally responded to the presence of below-ground neighbours by allocating more resources to shoot production. Therefore, semi-leafless field pea cultivars exhibit differences in below-ground responses to neighbours and it may be useful to include this as part of the selection criteria in breeding programs.
      Degree
      Master of Science (M.Sc.)
      Department
      Plant Sciences
      Program
      Plant Science
      Supervisor
      Willenborg, Christian J.
      Committee
      Shirtliffe, Steve J.; Warkentin, Tom D.; Dyck, Miles; Bai, Yuguang
      Copyright Date
      October 2015
      URI
      http://hdl.handle.net/10388/ETD-2015-10-2066
      Subject
      field pea
      competition
      competitive ability
      genotypes
      integrated weed management
      response to neighbours
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