Growth, phenology, and seed viability between glyphosate-resistant and glyphosate-susceptible hary fleabane

Kaspary, Tiago Edu; Lamego, Fabiane Pinto; Cutti, Luan; Aguiar, Adalin Cezar de Morais; Rigon, Carlos Alberto Gonsiorkiewicz; Basso, Claudir José

doi:10.1590/1678-4499.542

Cited by 21 publications

(34 citation statements)

References 24 publications

(35 reference statements)

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“…The liquid photosynthetic rate and the effectiveness in using luminosity that were verified in biotype R support the results found by Kaspary et al (2015), who observed that biotype R of C. bonariensis showed a quicker development than biotype S, with a great reproductive capacity. Associated to these characteristics, the amount of photosynthetic pigments was higher in all development stages, when compared to biotype S (Kaspary et al, 2014).…”

supporting

confidence: 86%

“…periods and/or under higher luminosity and temperature conditions, there have been differences in the development between the biotypes (Shrestha et al, 2010;Kaspary et al, 2015).…”

Section: (A) (B)mentioning

confidence: 99%

“…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%

“…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). On the other hand, studies with C. bonariensis biotypes coming from RR soybean production areas in Rio Grande do Sul allowed inferring that biotype R has better competitive abilities, compared with biotype S (Kaspary et al, 2014(Kaspary et al, , 2015.…”

mentioning

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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-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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supporting

confidence: 86%

“…periods and/or under higher luminosity and temperature conditions, there have been differences in the development between the biotypes (Shrestha et al, 2010;Kaspary et al, 2015).…”

Section: (A) (B)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

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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“…Herbicide application is also a stress to weedy plants, and it can select for evolution of herbicide resistance [5]. Adaptive changes in seed germination and seedling emergence, ower bud formation and owering time have also been observed in herbicide resistant biotypes [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Overexpression of AGAMOUS-like gene PfAG5 promotes early flowering in Polypogon fugax

Zhang

et al. 2020

Preprint

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Abstract Background: Herbicides are the major tool for controlling large populations of yield depleting weeds. However, overreliance on herbicides has resulted in weed adaptation and herbicide resistance. In recent years, early flowering weed species related to herbicide resistance is emerging, which may cause seed loss before crop harvest, creating a new problem for non-chemical weed management. However, mechanisms regulating early flowering in weedy species is rarely investigated. Results: The MADS-box gene family plays an important role in flowering time regulation and floral organogenesis. In this study, a homolog gene of AGAMOUS sub-family (referred to as PfAG5) of the MADS-box family was cloned from plants of an early flowering Polypogon fugax population resistant to the ACCase inhibitor herbicide (clodinafop-propargyl). The PfAG5 gene was functionally characterized in Arabidopsis thaliana. Over-expression of the PfAG5 gene in Arabidopsis resulted in early flowering with abnormal flowers (e.g. small petals, short plants and reduced seed set) compared to the wild type. The expression of the PfAG5 gene was high in leaves and flowers, but low in pods in transgenic Arabidopsis. The PfAG5 gene was earlier and higher expressed in the resistant (R) than the susceptible (S) P. fugax plants. Furthermore, one protein (FRIGIDA-like protein) interacting with PfAG5 in R P. fugax was identified by the yeast two-hybrid system with relevance to flowering time regulation. Conclusions: These results suggest that the PfAG5 gene is involved in modulating early flowering in P. fugax. This study provides the first evidence for the regulation mechanism of early flowering in an herbicide resistant weed species.

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Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

Santos

Silva

Amorim

et al. 2021

Pest Management Science

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BACKGROUND The current climate change scenario may affect water availability in the soil, impacting the agricultural sector. Planting of safflower (Carthamus tinctorius L.) has increased because of its potential for cultivation under drought conditions during the off‐season in Brazil and its high potential for use in biofuel production. There are several reports about the potential of low doses of glyphosate to promote plant growth and development (hormesis). Despite the concept of glyphosate hormesis being well established, little is known about any mitigating effect on plants under water deficit conditions. The hypothesis raised is that low doses of glyphosate promote water stress tolerance during the growth and reproductive phases of C. tinctorius exposed to different water regimes. RESULTS In regimes with and without water deficiency, growth of plants treated with low doses of glyphosate increased, reaching a maximum stimulus amplitude of ~ 131% of control. However, plants under water deficit required lower doses to achieve maximum growth and development. They maintained photosynthetic rates at the level of well‐watered plants because they had reduced stomatal conductance and transpiration. Gains in plant height and leaf area were the same as for controls. CONCLUSIONS Low doses of glyphosate can act as mitigators of water deficit in C. tinctorius, allowing plants to maintain their metabolism, reaching levels close to those of plants without water stress, as observed for plant height and leaf area. Our findings indicate that there are even greater implications for understanding glyphosate hormesis in plants under drought conditions, given the current climate change scenario. © 2020 Society of Chemical Industry

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Growth, phenology, and seed viability between glyphosate-resistant and glyphosate-susceptible hary fleabane

Cited by 21 publications

References 24 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

Overexpression of AGAMOUS-like gene PfAG5 promotes early flowering in Polypogon fugax

Glyphosate hormesis mitigates the effect of water deficit in safflower (Carthamus tinctorius L.)

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