Conyza spp.: From Ugly Duckling to Agriculture's Fittest Swan - Brief Review

Concenço, Germani; Concenço, Samara Emerim

doi:10.1590/s0100-83582016340100019

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…From an agronomic perspective, the genus Conyza Less. is responsible for decreasing soybean yields up to 30% 9 , 10 . The species of this genus are easily found in no-till system, where they became a great issue in the cereal crop production worldwide 3 , 8 .…”

Section: Introductionmentioning

confidence: 99%

“…In summary, a good chemical horseweed control became arduous 4 , 12 , 13 . Furthermore, because this species is stress-tolerant and strong competitors 10 , 14 , alternative management strategies should be considered in the no-till system. Those strategies based on the species biology/ecology and soil management applied in an integrated manner seem to be promising to reduce the pollution pressure on the environment 8 , 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

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Nutrient availability and pH level affect germination traits and seedling development of Conyza canadensis

Follmer

Hummes

Lângaro

et al. 2021

Sci Rep

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Reducing pesticide application in agricultural land is a major challenge for the twenty-first century. Responses of weed seed’s germination and seedling’s early development to chemical soil conditions around the seed may be a promising way to aid weed control in a no-till system. Thus, the objective of this work was to test, under controlled conditions, whether different chemical conditions affect the germination and development of horseweed [Conyza canadensis (L.) Cronquist]. We used, as treatment, solutions containing different nutrients (P, K, Ca, and Mg), separately and in combination, and at two pH levels (4.8 and 6.5). Phosphorus alone inhibited horseweed seed germination at ~ 7 times while had ~ 4 times reduction in final germination percentage and germination speed index for both pH tested. Other nutrients tested had a no-effect in germination speed index compared to the control treatment. Potassium alone or associated with other ions (P, Ca, and Mg) at pH 4.8 had a synergistic effect on seedling development (root and shoot length). In the same way, K associated with Mg was synergistic to the root length at pH 6.5. Seeds in the control treatment (distilled water) presented a high germination speed index at pH 6.5, while at low pH this parameter was higher when in association with KMg, PMg and Ca. The findings demonstrate that seed germination traits and seedling development of horseweed depend on nutrient kind exposure and pH conditions in the seed environment. This work suggests that adequate topsoil management (i.e., pH and nutrient availability) may aid to reduce weed germination, because, it consists of an important factor of weed occurrence in agricultural areas.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nutrient availability and pH level affect germination traits and seedling development of Conyza canadensis

Follmer

Hummes

Lângaro

et al. 2021

Sci Rep

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“…Of the many species belonging to Conyza Less genus, some of them are important weeds that cause economic losses in agriculture due to its worldwide occurrence, resistance to herbicides ans other traids which turn these species into first grade weeds (Bossdorf et al, 2005;Concenço and Concenço, 2016). Among these species, Conyza sumatrensis (Retz.)…”

Section: Introductionmentioning

confidence: 99%

Genetic Dissimilarity in Conyza sumatrensis Revealed by Simple Sequence Repeat (SSR) Markers

et al. 2020

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In view of the rapid evolution of Conyza sumatrensis populations resistant to glyphosate, it is necessary to understand the genetic diversity aimed to improve strategies for managing this weed. We investigated the genetic dissimilarity among 15 biotypes of C. sumatrensis from different geographic regions using microsatellite loci. The biotypes, were cultivated in a greenhouse to obtain vegetal material for DNA extraction. Nineteen microsatellite markers (SSR), were developed for C. sumatrensis biotypes. The genetic dissimilarity was estimated by the Jaccard coefficient (JC) and the biotypes grouped by the UPGMA method. The results demonstrated a high dissimilarity (JC = 7.14 to 82.62) of the analyzed material, with the biotypes forming five groups, being one group formed just by the susceptible biotype and in the others grouped by biotypes from distinct locations in the same group The high genetic diversity of C. sumatrensis indicates that the biotypes may show different responses to different management strategies, and that the mechanisms of resistance to herbicides and characteristics of evolution of populations due to adaptability may be some of the factors involved in the genetic variability of the species.

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“…belonging to the botanical Asteraceae family is native to the Americas and now has a cosmopolitan distribution (Shrestha et al, 2014;Bajwa et al, 2016). Hairy fleabane is highly competitive with crops and is among the most problematic weed species to management around the world (Shrestha et al, 2014;Bajwa et al, 2016;Concenço and Concenço, 2016). The interferences caused by one hairy fleabane plant m -2 can reduce the soybean yield up to 36% (Trezzi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Does the Glyphosate Treatment Interfere Negatively on RNA Integrity in Glyphosate-Resistant and -Sensitive Conyza bonariensis?

et al. 2019

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The hairy fleabane (Conyza bonariensis (L.) Cronq.) is among the most problematic glyphosate-resistant weeds to manage around the world. In weed science, molecular approaches such as RNA sequencing (RNA-Seq) and quantitative reverse-transcription polymerase chain reaction (RT-qPCR) have been employed to study molecular responses to glyphosate treatment in Conyza species. Glyphosate treatment leads to reactive oxygen species (ROS) production in plants which could damage the RNA. Degraded RNA is an issue and can compromise further molecular analysis. Thus, the objective of this study was to evaluate whether glyphosate treatment interferes negatively on RNA integrity of glyphosate-resistant andsensitive hairy fleabane biotypes. Two experiments were performed using glyphosate doses from 0 to 11,840 g a.e. ha -1 and evaluated in a time-course until 288 hours after treatment. The total of 86 RNA samples were evaluated. The RNA integrity was evaluated in a Bioanalyzer 2100 equipment according to RNA integrity number (RIN) scores and electrophoresis gel. The RIN scores ranged from 5.1 to 9.0. Glyphosate doses do not reduce the RIN scores in both glyphosate-resistant and -sensitive biotypes of hairy fleabane. Visual and automatic analysis of electrophoresis gel show suitable results for all RNA samples, with well-defined bands at 28S and 18S positions and no degradation. The results of the analysis indicate that glyphosate treatment does not affect the RNA integrity of glyphosate-resistant and -sensitive biotypes of hairy fleabane until 288 and 192 hours after glyphosate treatment, respectively. The RNA integrity analysis provides useful results to evaluate the RNA condition for further analysis. However, the costs were around US$ 14.25 per sample, considering only reagents. These results are useful for planning future timecourse experiments in Conyza spp. after glyphosate treatment.Keywords: hairy fleabane, molecular analysis, RNA integrity number (RIN). (Conyza bonariensis (L.) Cronq.) está entre as plantas daninhas resistentes ao glifosato mais difíceis de serem manejadas em todo o mundo. Na ciência das plantas daninhas, abordagens moleculares, como o sequenciamento de RNA (RNA-Seq) e a reação da transcriptase reversa da polimerase em tempo real (RT-qPCR), têm sido empregadas para estudar as respostas moleculares ao tratamento com glifosato em espécies de Conyza. No entanto, o tratamento com glifosato leva à produção de espécies reativas de oxigênio (ROS) em plantas, que podem danificar o RNA. A degradação do RNA é um problema e pode comprometer futuras análises moleculares. Assim, o objetivo deste estudo foi avaliar se o tratamento com glifosato interfere negativamente na integridade do RNA de biótipos de buva resistente e sensível ao glifosato. Dois experimentos foram realizados I D I D I D Planta Daninha 2019; v37:e019217909 PIASECKI, C. et al. Does the glyphosate treatment interfere negatively on RNA integrity in glyphosate-resistant and -sensitive ... 2 utilizando doses de glifosato de 0 a 11.840 g e.a. ha -1 e av...

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Conyza spp.: From Ugly Duckling to Agriculture's Fittest Swan - Brief Review

Cited by 5 publications

References 9 publications

Nutrient availability and pH level affect germination traits and seedling development of Conyza canadensis

Nutrient availability and pH level affect germination traits and seedling development of Conyza canadensis

Genetic Dissimilarity in Conyza sumatrensis Revealed by Simple Sequence Repeat (SSR) Markers

Does the Glyphosate Treatment Interfere Negatively on RNA Integrity in Glyphosate-Resistant and -Sensitive Conyza bonariensis?

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