Dynamics of glyphosate resistance in Lolium perenne: pollen-mediated gene flow under field conditions in Argentina
The genus Lolium has shown a high tendency to evolve resistance to herbicides. Considering the high level of allogamy of L. perenne and the importance of the wind as an agent for pollen dispersion, the aim of this work was to assess and quantify the effective glyphosate-resistant gene flow by pollen...
| Authors: | , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2018 |
| Country: | Argentina |
| Institution: | Instituto Nacional de Tecnología Agropecuaria |
| Repository: | INTA Digital (INTA) |
| Language: | English |
| OAI Identifier: | oai:localhost:20.500.12123/5303 |
| Online Access: | https://www.mdpi.com/2073-4395/8/12/286 http://hdl.handle.net/20.500.12123/5303 https://doi.org/10.3390/agronomy8120286 |
| Access Level: | Open access |
| Keyword: | Lolium Perenne Glifosato Resistencia a los Herbicidas Flujo Genético Experimentación en Campo Polinización Cruzada Argentina Glyphosate Resistance to Herbicides Gene Flow Field Experimentation Cross Pollination Raigras perenne |
| Summary: | The genus Lolium has shown a high tendency to evolve resistance to herbicides. Considering the high level of allogamy of L. perenne and the importance of the wind as an agent for pollen dispersion, the aim of this work was to assess and quantify the effective glyphosate-resistant gene flow by pollen in L. perenne under field conditions. Pollen-mediated gene flow from glyphosate-resistant to -susceptible plants was studied using a donor–receptor design. The results indicate that the effective gene flow reached trap plants distanced ≤35 m downwind from the source of pollen. The progeny of receptor plants growing 0 m from the pollen donors showed 13% of individuals with low glyphosate sensitivity. This represents a seven-fold increase in the frequency of glyphosate-resistant individuals found in the progeny of plants isolated during the flowering period (negative control). Similarly, the progenies of plants grown at 15 and 25 m from the source of glyphosate resistance showed an increase in the frequency of resistant plants by about four- and two-fold, respectively. When the receptor plants were located at >35 m, no glyphosate-resistant plants were detected in their progenies. Management should aim for prevention or delay of flowering of glyphosate-resistant plants. |
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