Distribution of glyphosate-resistant and glyphosate-susceptible hairy fleabane (Conyza bonariensis) in central California and their phenological development

Shrestha, Anil; Steinhauer, Katrina M.; Moretti, Marcelo L.; Hanson, Bradley D.; Jasieniuk, Marie; Hembree, Kurt J.; Wright, Steven D.

doi:10.1007/s10340-013-0524-8

Cited by 17 publications

(23 citation statements)

References 27 publications

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“…The results found in literature about effects on the adaptability of plants according to glyphosate resistance suggest the glyphosate-resistant biotypes may present some benefits in the photosynthetic performance under different luminosities (Shrestha et al, 2010(Shrestha et al, , 2014Kaspary et al, 2014Kaspary et al, , 2015. However, until now, no information has been related to changes in this photosynthetic performance among hairy fleabane biotypes coming from areas with similar history in the management of weeds.…”

Section: Introductionmentioning

confidence: 99%

“…Associated to these characteristics, the amount of photosynthetic pigments was higher in all development stages, when compared to biotype S (Kaspary et al, 2014). Similarly, biotypes R of C. canadensis developed faster than the susceptible biotype, in the absence of competitors (Shrestha et al, 2010(Shrestha et al, , 2014. In addition to this, the photosynthetic parameters (A, QY and LCP) observed for biotype R may be related to the high amount of photosynthetic pigments determined for biotype R (Kaspary et al, 2014).…”

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confidence: 96%

“…Choosing a susceptible biotype from an area with a similar weed management aims at avoiding the occurrence of biotypes with different ecologic history characteristics, since susceptible biotypes coming from non-agricultural areas may present superior biological and evolutional characteristics (Shrestha et al, 2014).…”

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confidence: 99%

“…Studies have identified that glyphosate-resistant biotypes do not present costs in the adaptation under competitive and non-competitive conditions (Travlos and Chachalis, 2013;Shrestha et al, 2014). Other studies demonstrated that the absolute growth of biotype S was higher than biotype R for C. canadensis and C. bonariensis coming from citrus orchard areas (Moreira et al, 2010).…”

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confidence: 99%

“…Environmental and crop management factors may select plants with different growth and development rates, due to the imposition of different selection pressures of the medium over biotypes (Shrestha et al, 2014). At the population level, the result of ecological adaptations is subjected to the level of disturbance and stresses in which plants develop (Radosevich et al, 1997).…”

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Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

et al. 2018

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-Herbicide resistance can confer lower competitive abilities; however scarse information is available about the photosynthetic performance between glyphosate-resistant and -susceptible hairy fleabane biotypes coming from areas with similar weed management history. Thus, the goal was to evaluate the photosynthetic performance under different light intensities between glyphosateresistant and -susceptible hairy fleabane biotypes, from RR soybean fields with a similar weed management history. The tested factors were glyphosate resistant and susceptible biotypes and 12 levels of photosynthetic photon flux density. Plants were cultivated in plastic cups, and at the stage of 10-12 leaves they were subjected to treatments with artificial lighting systems. The net photosynthetic rate, stomatal conductance, substomatal CO 2 concentration, transpiration rate, instantaneous water use efficiency, light compensation point and quantum yield were evaluated. In all the evaluated photosynthetic parameters, biotype R showed superior characteristics compared to susceptible biotypes, with the exception of the transpiration rate, where there were no differences. The differences between biotypes may not be associated to glyphosate resistance or susceptibility, but to the evolutionary characteristics of the biotypes.Keywords: Conyza bonariensis, ecological adaptability, photosynthetic photon flux; carbon assimilation rate, gas exchange, light response curve. RESUMO -

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confidence: 96%

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confidence: 99%

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Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

et al. 2018

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Hairy fleabane germination in response to temperature, osmotic potential, pH, salinity levels, and seed dormancy periods

et al. 2022

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Hairy fleabane (Erigeron bonariensis L. Cronq.) is an invasive weed in lowdisturbance annual, perennial, and noncrop systems in the San Joaquin Valley (SJV), California. It is often observed emerging year-round in diverse environmental conditions in the SJV. However, very little information is available on the reasons for this. The study aimed to assess the effect of temperature, water potential, salinity, pH level, and dormancy periods on hairy fleabane's germination. Tests were conducted at different day/night temperatures (5:0, 10:5, 15:10, 20:15, 25:20, and 30:25 ˚C), water potential (0 to -5.56 MPa), salinity (0-25 dS m -1 ), and pH (5-9). Germination tests were also performed on seeds the day they were collected from mature plants, and 7, 14, and 21 d later. Tests were conducted in growth chambers set to 20 ˚C or under ambient laboratory conditions at 22 ˚C. About 1% of the seeds germinated at 5 ˚C but maximum germination occurred at 25:20 ˚C. About 9% of the seeds germinated at -0.51 MPa and the estimated value for 50% germination reduction was -0.2 MPa. Seed germination had high tolerance to salinity, as 42% of the seeds germinated at 15 dS m -1 . Germination did not differ across pH levels. About 50% of the seeds germinated the day they were collected, indicating that this species had a very short seed dormancy requirement. These findings could explain why hairy fleabane is observed emerging year-round in the SJV, particularly in irrigated cropping systems. INTRODUCTIONHairy fleabane (Erigeron bonariensis L. Cronq.) is considered to be a native plant of the more temperate parts of South America (Michael, 1977). In the United States, it is now a common annual weed in cropped and noncropped areas of California (Shrestha et al., 2016), and other west coast and southern states (USDA-NRCS, 2021). Thébaud and Abbott (1995) considered this species as a summer annual weed, and it is classified as a summer annual weed in California

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The challenge of herbicide resistance around the world: a current summary

Peterson¹,

Collavo

Ovejero

et al. 2018

Pest Management Science

222

178

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Herbicide-resistant weeds have been observed since the early years of synthetic herbicide development in the 1950s and 1960s. Since that time there has been a consistent increase in the number of cases of herbicide resistance and the impact of herbicide-resistant weeds. Although the nature of crop production varies widely around the world, herbicides have become a primary tool for weed control in most areas. Dependence on herbicides continues to increase as global populations migrate away from rural areas to cities and the agricultural labor force declines. This increased use of herbicides and the concurrent selection pressure have resulted in a rise in cases of multiple resistance, leaving some farmers with few or no herbicide options for certain weed infestations. Global population and economic forces drive many farmer choices regarding crop production and weed control. The challenge is how to insert best management practices into the decision-making process while addressing various economic and regulatory needs. This review endeavors to provide a current overview of herbicide resistance challenges in the major crop production areas of the world and discusses some research initiatives designed to address portions of the problem. © 2017 Society of Chemical Industry.

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Distribution of glyphosate-resistant and glyphosate-susceptible hairy fleabane (Conyza bonariensis) in central California and their phenological development

Cited by 17 publications

References 27 publications

Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

Hairy fleabane germination in response to temperature, osmotic potential, pH, salinity levels, and seed dormancy periods

The challenge of herbicide resistance around the world: a current summary

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