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Relative Competitiveness of Protoporphyrinogen Oxidase-Resistant Common Waterhemp (Amaranthus Rudis)

  • Michael G. Duff (a1), Kassim Al-Khatib (a1) and Dallas E. Peterson (a1)

Abstract

Research was conducted to determine the competitiveness and fitness of a protoporphyrinogen oxidase (protox)-resistant common waterhemp biotype. Protox-resistant and protox-susceptible biotypes were grown under noncompetitive and competitive arrangements in the greenhouse. In the noncompetitive study, a single plant of each biotype was planted separately in 15-cm-diam pots. Photosynthesis, leaf area, and plant biomass were measured 10, 20, 30, and 40 d after transplanting (DATP). In general, photosynthesis rate and plant biomass were similar between biotypes. However, the protox-resistant biotype had higher leaf area than the susceptible biotype at 20, 30, and 40 DATP. A replacement series study was conducted in the greenhouse to evaluate the relative competitiveness of protox-resistant and protox-susceptible common waterhemp. Photosynthesis, leaf area, plant height, and plant biomass were measured 7, 14, 21, and 28 DATP. Protox-resistant and -susceptible common waterhemp were equally competitive 28 DATP. Relative crowding coefficient values 28 DATP were 0.86, 0.89, 1.09, and 1.13 for photosynthesis, leaf area, plant height, and plant biomass, respectively. This suggests protox-resistant and -susceptible common waterhemp were equally competitive and the frequency of protox-resistant biotype is unlikely to decrease in the absence of protox–herbicide selection pressure.

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Corresponding author

Corresponding authors's E-mail: khatib@ksu.edu

References

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Relative Competitiveness of Protoporphyrinogen Oxidase-Resistant Common Waterhemp (Amaranthus Rudis)

  • Michael G. Duff (a1), Kassim Al-Khatib (a1) and Dallas E. Peterson (a1)

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