Impact of Biotic and Abiotic Stresses on the Competitive Ability of Multiple Herbicide Resistant Wild Oat Avena fatuaReportar como inadecuado




Impact of Biotic and Abiotic Stresses on the Competitive Ability of Multiple Herbicide Resistant Wild Oat Avena fatua - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Ecological theory predicts that fitness costs of herbicide resistance should lead to the reduced relative abundance of resistant populations upon the cessation of herbicide use. This greenhouse research investigated the potential fitness costs of two multiple herbicide resistant MHR wild oat Avena fatua populations, an economically important weed that affects cereal and pulse crop production in the Northern Great Plains of North America. We compared the competitive ability of two MHR and two herbicide susceptible HS A. fatua populations along a gradient of biotic and abiotic stresses The biotic stress was imposed by three levels of wheat Triticum aestivum competition 0, 4, and 8 individuals pot−1 and an abiotic stress by three nitrogen N fertilization rates 0, 50 and 100 kg N ha−1. Data were analyzed with linear mixed-effects models and results showed that the biomass of all A. fatua populations decreased with increasing T. aestivum competition at all N rates. Similarly, A. fatua relative growth rate RGR decreased with increasing T. aestivum competition at the medium and high N rates but there was no response with 0 N. There were no differences between the levels of biomass or RGR of HS and MHR populations in response to T. aestivum competition. Overall, the results indicate that MHR does not confer growth-related fitness costs in these A. fatua populations, and that their relative abundance will not be diminished with respect to HS populations in the absence of herbicide treatment.



Autor: Erik A. Lehnhoff , Barbara K. Keith, William E. Dyer, Fabian D. Menalled

Fuente: http://plos.srce.hr/



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