Abstract
We aimed with this study to assay the allelopathic potential of wheat genotypes in inhibiting germination and initial growth of sourgrass (Digitaria insularis) resistant to the herbicide glyphosate. Two experiments were installed under greenhouse conditions: the first one aimed to assay the potential of wheat genotypes in inhibiting emergence and initial growth of two test plants, and the second aimed to evaluate the potential of those wheat genotypes which performed better at the first experiment, inhibiting the emergence and initial growth of sourgrass biotypes resistant to the herbicide glyphosate. Five doses of aqueous cool-extracted extract from 32 wheat genotypes were applied to tomato and cucumber (Experiment 1) aiming to identify the ones with higher inhibitory effect. The five most inhibitory wheat genotypes were selected for Experiment 2, where the same doses of extract were applied on sourgrass. For both experiments, shoot fresh and dry mass, as well as water content, were assessed. Sourgrass germination is affected by wheat extracts, but initial seedling growth seems not to be affected; wheat genotypes differ in terms of their allelopathic potential in inhibiting sourgrass germination; wheat presents little inhibitory effect on sourgrass.
Highlights
Recent genetically modified organism (GMO) technologies have aimed to employ herbicide resistance to soybean cultivars, and have drastically reduced infestation of weed species in most fields with such technologies
The glyphosate-tolerant soybean was widely used in Brazil, and currently Conyza bonariensis, C. canadensis, C. sumatrensis, Digitaria insularis, and Lolium multiflorum are resistant to glyphosate in Brazil, due to its extensive use in Roundup Ready® soybean [2]
The first experiment aimed to screen the potential of wheat genotypes in inhibiting emergence and initial growth of test plants, and the second to assess the potential of those wheat lineages which performed better at the first experiment, in inhibiting the emergence and initial growth of sourgrass (Digitaria insularis) biotypes resistant to the herbicide glyphosate [10]
Summary
Recent genetically modified organism (GMO) technologies have aimed to employ herbicide resistance to soybean cultivars, and have drastically reduced infestation of weed species in most fields with such technologies. Some plant species produce chemicals which are accumulated in soil, inhibiting germination and/or growth of other plant species This phenomenon is called allelopathy [6]. Lamego et al [8] highlight that in addition to a winter species efficient in reducing Conyza establishment, a good burndown prior to planting soybean is essential to reduce problems post-emergence. We took this effect of wheat on Conyza spp. as a background for further studies. We aimed with this study to assay the allelopathic potential of wheat genotypes in inhibiting germination and initial growth of sourgrass (Digitaria insularis) resistant to the herbicide glyphosate
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
