Growth and fitness of triazine-susceptible and triazine-resistant common waterhemp (Amaranthus tuberculatus var. rudis) |
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| Authors: | NADER SOLTANI JOSHUA D. VYN CLARENCE J. SWANTON SUSAN WEAVER PETER H. SIKKEMA |
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| Affiliation: | Department of Plant Agriculture, Ridgetown Campus, University of Guelph, Ridgetown,;Department of Plant Agriculture, University of Guelph, Guelph and;Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada |
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| Abstract: | Two greenhouse trials were conducted over a 2 year period (2004 and 2005) to compare the relative growth potential and fitness of triazine-susceptible (TS) and triazine-resistant (TR) waterhemp biotypes. Waterhemp plants from each biotype were grown in 6 L pots in the greenhouse in a completely randomized design. There was no difference in leaf number, plant height, plant biomass, time to bud or time to flower between the two biotypes. The TR female waterhemp plants produced 30% less reproductive biomass and 39% less seed than the TS biotype. The fitness penalty associated with triazine resistance was related to reproductive capability, not to vegetative growth. |
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| Keywords: | Amaranthus tuberculatus var. rudis common waterhemp fitness penalty triazine resistance |
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