1
|
Phosphoglycolate salvage in a chemolithoautotroph using the Calvin cycle. Proc Natl Acad Sci U S A 2020; 117:22452-22461. [PMID: 32820073 PMCID: PMC7486775 DOI: 10.1073/pnas.2012288117] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The Calvin cycle is the most important carbon fixation pathway in the biosphere. However, its carboxylating enzyme Rubisco also accepts oxygen, thus producing 2-phosphoglycolate. Phosphoglycolate salvage pathways were extensively studied in photoautotrophs but remain uncharacterized in chemolithoautotrophs using the Calvin cycle. Here, we study phosphoglycolate salvage in the chemolithoautotrophic model bacterium Cupriavidus necator H16. We demonstrate that this bacterium mainly reassimilates 2-phosphoglycolate via the glycerate pathway. Upon disruption of this pathway, a secondary route, which we term the malate cycle, supports photorespiration by completely oxidizing 2-phosphoglycolate to CO2. While the malate cycle was not previously known to metabolize 2-phosphoglycolate in nature, a bioinformatic analysis suggests that it may support phosphoglycolate salvage in diverse chemoautotrophic bacteria. Carbon fixation via the Calvin cycle is constrained by the side activity of Rubisco with dioxygen, generating 2-phosphoglycolate. The metabolic recycling of phosphoglycolate was extensively studied in photoautotrophic organisms, including plants, algae, and cyanobacteria, where it is referred to as photorespiration. While receiving little attention so far, aerobic chemolithoautotrophic bacteria that operate the Calvin cycle independent of light must also recycle phosphoglycolate. As the term photorespiration is inappropriate for describing phosphoglycolate recycling in these nonphotosynthetic autotrophs, we suggest the more general term “phosphoglycolate salvage.” Here, we study phosphoglycolate salvage in the model chemolithoautotroph Cupriavidus necator H16 (Ralstonia eutropha H16) by characterizing the proxy process of glycolate metabolism, performing comparative transcriptomics of autotrophic growth under low and high CO2 concentrations, and testing autotrophic growth phenotypes of gene deletion strains at ambient CO2. We find that the canonical plant-like C2 cycle does not operate in this bacterium, and instead, the bacterial-like glycerate pathway is the main route for phosphoglycolate salvage. Upon disruption of the glycerate pathway, we find that an oxidative pathway, which we term the malate cycle, supports phosphoglycolate salvage. In this cycle, glyoxylate is condensed with acetyl coenzyme A (acetyl-CoA) to give malate, which undergoes two oxidative decarboxylation steps to regenerate acetyl-CoA. When both pathways are disrupted, autotrophic growth is abolished at ambient CO2. We present bioinformatic data suggesting that the malate cycle may support phosphoglycolate salvage in diverse chemolithoautotrophic bacteria. This study thus demonstrates a so far unknown phosphoglycolate salvage pathway, highlighting important diversity in microbial carbon fixation metabolism.
Collapse
|
2
|
Development of a screening and confirmatory method for the analysis of polar endogenous compounds in saliva based on a liquid chromatographic-tandem mass spectrometric system. J Chromatogr A 2019; 1590:88-95. [DOI: 10.1016/j.chroma.2019.01.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 12/10/2018] [Accepted: 01/01/2019] [Indexed: 02/06/2023]
|
3
|
Palma-Bautista C, Gherekhloo J, Domínguez-Martínez PA, Domínguez-Valenzuela JA, Cruz-Hipolito HE, Alcántara-de la Cruz R, Rojano-Delgado AM, De Prado R. Characterization of three glyphosate resistant Parthenium hysterophorus populations collected in citrus groves from Mexico. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2019; 155:1-7. [PMID: 30857618 DOI: 10.1016/j.pestbp.2018.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/01/2018] [Accepted: 11/02/2018] [Indexed: 06/09/2023]
Abstract
Continuous use of glyphosate in citrus groves in the Gulf of Mexico region has selected for resistant Parthenium hysterophorus L. populations. In this study, the target-site and non-target-site resistance mechanisms were characterized in three putative glyphosate-resistant (GR) P. hysterophorus populations, collected in citrus groves from Acateno, Puebla (GR1 and GR2) and Martínez de la Torre, Veracruz (GR3), and compared with a susceptible population (GS). Based on plant mortality, the GR populations were 9.2-17.3 times more resistant to glyphosate than the GS population. The low shikimate accumulation in the GR population confirmed this resistance. Based on plant mortality and shikimate accumulation, the GR3 population showed intermediate resistance to glyphosate. The GR populations absorbed 15-28% less 14C-glyphosate than the GS population (78.7% absorbed from the applied) and retained 48.7-70.7% of 14C-glyphosate in the treated leaf, while the GS population translocated ~68% of absorbed herbicide to shoots and roots. The GR3 population showed the lowest translocation and absorption rates, but was found to be susceptible at the target site level. The 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) gene sequence of the GR1 and GR2 populations showed the Pro106-Ser mutation, conferring 19- and 25-times more resistance in comparison to the GS population, respectively. Reduced absorption and impaired translocation conferred glyphosate resistance on the GR3 population, and contributed partially to the resistance of the GR1 and GR2 populations. Additionally, the Pro-106-Ser mutation increased the glyphosate resistance of the last two P. hysterophorus populations.
Collapse
Affiliation(s)
| | - Javid Gherekhloo
- Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, 49189-43464 Gorgan, Iran.
| | - Pablo Alfredo Domínguez-Martínez
- National Institute of Forestry, Agriculture and Livestock Research (INIFAP)-Valle del Guadiana Experimental Field, 34170 Durango, Mexico
| | | | | | | | - Antonia M Rojano-Delgado
- Department of Agricultural Chemistry and Edaphology, University of Cordoba, 14071 Cordoba, Spain
| | - Rafael De Prado
- Department of Agricultural Chemistry and Edaphology, University of Cordoba, 14071 Cordoba, Spain
| |
Collapse
|
4
|
Ma NL, Kadir NA, Nordin MMA, Tan SH, Lam SS. Progress and Challenges of Detecting Biomarkers for the Development of Pesticide Biosensor in Rice Plants. ADVANCES IN RICE RESEARCH FOR ABIOTIC STRESS TOLERANCE 2019:821-838. [DOI: 10.1016/b978-0-12-814332-2.00041-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
5
|
Bracamonte E, Silveira HMD, Alcántara-de la Cruz R, Domínguez-Valenzuela JA, Cruz-Hipolito HE, De Prado R. From tolerance to resistance: mechanisms governing the differential response to glyphosate in Chloris barbata. PEST MANAGEMENT SCIENCE 2018; 74:1118-1124. [PMID: 29384251 DOI: 10.1002/ps.4874] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 01/22/2018] [Accepted: 01/22/2018] [Indexed: 05/11/2023]
Abstract
BACKGROUND Susceptibility and the mechanism (s) governing tolerance/resistance to glyphosate were characterized in two putative-glyphosate-resistant Chloris barbata populations (R1 and R2), collected in Persian lime orchards from Colima State, Mexico, comparing them with one non-treated population (referred to as S). RESULTS Glyphosate doses required to reduce fresh weight or cause mortality by 50% were 4.2-6.4 times higher in resistant populations than in the S population. The S population accumulated 4.3 and 5.2 times more shikimate than the R2 and R1 populations, respectively. There were no differences in 14 C-glyphosate uptake between R and S populations, but the R plants translocated at least 12% less herbicide to the rest of plant and roots 96 h after treatment. Insignificant amounts of glyphosate were metabolized to aminomethyl phosphonate and glyoxylate in both R and S plants. The 5-enolpyruvylshikimate-3-phosphate synthase gene of the R populations contained the Pro106-Ser mutation, giving them a resistance 12 (R2) and 14.7 (R1) times greater at target-site level compared with the S population. CONCLUSION The Pro106-Ser mutation governs the resistance to glyphosate of the R1 and R2 C barbata populations, but the impaired translocation could contribute to the resistance. These results confirm the first case of glyphosate resistance evolved in this species. © 2018 Society of Chemical Industry.
Collapse
Affiliation(s)
- Enzo Bracamonte
- Faculty of Agricultural Sciences, National University of Cordoba (UNC), Cordoba, Argentina
| | | | | | | | | | - Rafael De Prado
- Department of Agricultural Chemistry and Edaphology, University of Cordoba, Cordoba, Spain
| |
Collapse
|
6
|
Bracamonte ER, Fernández-Moreno PT, Bastida F, Osuna MD, Alcántara-de la Cruz R, Cruz-Hipolito HE, De Prado R. Identifying Chloris Species from Cuban Citrus Orchards and Determining Their Glyphosate-Resistance Status. FRONTIERS IN PLANT SCIENCE 2017; 8:1977. [PMID: 29187862 PMCID: PMC5694787 DOI: 10.3389/fpls.2017.01977] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 11/02/2017] [Indexed: 05/12/2023]
Abstract
The Chloris genus is a C4 photosynthetic species mainly distributed in tropical and subtropical regions. Populations of three Chloris species occurring in citrus orchards from central Cuba, under long history glyphosate-based weed management, were studied for glyphosate-resistant status by characterizing their herbicide resistance/tolerance mechanisms. Morphological and molecular analyses allowed these species to be identified as C. ciliata Sw., Chloris elata Desv., and Chloris barbata Sw. Based on the glyphosate rate that causes 50% mortality of the treated plants, glyphosate resistance (R) was confirmed only in C. elata, The R population was 6.1-fold more resistant compared to the susceptible (S) population. In addition, R plants of C. elata accumulated 4.6-fold less shikimate after glyphosate application than S plants. Meanwhile, populations of C. barbata and C. ciliata with or without glyphosate application histories showed similar LD50 values and shikimic acid accumulation rates, demonstrating that resistance to glyphosate have not evolved in these species. Plants of R and S populations of C. elata differed in 14C-glyphosate absorption and translocation. The R population exhibited 27.3-fold greater 5-enolpyruvyl shikimate-3-phosphate synthase (EPSPS) activity than the S population due to a target site mutation corresponding to a Pro-106-Ser substitution found in the EPSPS gene. These reports show the innate tolerance to glyphosate of C. barbata and C. ciliata, and confirm the resistance of C. elata to this herbicide, showing that both non-target site and target-site mechanisms are involved in its resistance to glyphosate. This is the first case of herbicide resistance in Cuba.
Collapse
Affiliation(s)
- Enzo R. Bracamonte
- Faculty of Agricultural Sciences, National University of Cordoba (UNC), Cordoba, Argentina
| | | | - Fernando Bastida
- Department of Agroforestry Sciences, University of Huelva, Huelva, Spain
| | - María D. Osuna
- Agrarian Research Center “Finca La Orden Valdesequera”, Badajoz, Spain
| | - Ricardo Alcántara-de la Cruz
- Departamento de Entomologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
- *Correspondence: Ricardo Alcántara-de la Cruz
| | | | - Rafael De Prado
- Department of Agricultural Chemistry and Edaphology, University of Cordoba, Cordoba, Spain
| |
Collapse
|
7
|
Alcántara-de la Cruz R, Fernández-Moreno PT, Ozuna CV, Rojano-Delgado AM, Cruz-Hipolito HE, Domínguez-Valenzuela JA, Barro F, De Prado R. Target and Non-target Site Mechanisms Developed by Glyphosate-Resistant Hairy beggarticks ( Bidens pilosa L.) Populations from Mexico. FRONTIERS IN PLANT SCIENCE 2016; 7:1492. [PMID: 27752259 PMCID: PMC5046737 DOI: 10.3389/fpls.2016.01492] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 09/20/2016] [Indexed: 05/26/2023]
Abstract
In 2014 hairy beggarticks (Bidens pilosa L.) has been identified as being glyphosate-resistant in citrus orchards from Mexico. The target and non-target site mechanisms involved in the response to glyphosate of two resistant populations (R1 and R2) and one susceptible (S) were studied. Experiments of dose-response, shikimic acid accumulation, uptake-translocation, enzyme activity and 5-enolpyruvyl shikimate-3-phosphate synthase (EPSPS) gene sequencing were carried out in each population. The R1 and R2 populations were 20.4 and 2.8-fold less glyphosate sensitive, respectively, than the S population. The resistant populations showed a lesser shikimic acid accumulation than the S population. In the latter one, 24.9% of 14C-glyphosate was translocated to the roots at 96 h after treatment; in the R1 and R2 populations only 12.9 and 15.5%, respectively, was translocated. Qualitative results confirmed the reduced 14C-glyphosate translocation in the resistant populations. The EPSPS enzyme activity of the S population was 128.4 and 8.5-fold higher than the R1 and R2 populations of glyphosate-treated plants, respectively. A single (Pro-106-Ser), and a double (Thr-102-Ile followed by Pro-106-Ser) mutations were identified in the EPSPS2 gene conferred high resistance in R1 population. Target-site mutations associated with a reduced translocation were responsible for the higher glyphosate resistance in the R1 population. The low-intermediate resistance of the R2 population was mediated by reduced translocation. This is the first glyphosate resistance case confirmed in hairy beggarticks in the world.
Collapse
Affiliation(s)
- Ricardo Alcántara-de la Cruz
- Department of Agricultural Chemistry and Edaphology, Campus of Rabanales, University of CordobaCordoba, Spain
- Department of Agricultural Parasitology, Chapingo Autonomous UniversityTexcoco, Mexico
| | - Pablo T. Fernández-Moreno
- Department of Agricultural Chemistry and Edaphology, Campus of Rabanales, University of CordobaCordoba, Spain
| | - Carmen V. Ozuna
- Institute for Sustainable Agriculture, Spanish National Research CouncilCordoba, Spain
| | - Antonia M. Rojano-Delgado
- Department of Agricultural Chemistry and Edaphology, Campus of Rabanales, University of CordobaCordoba, Spain
| | | | | | - Francisco Barro
- Institute for Sustainable Agriculture, Spanish National Research CouncilCordoba, Spain
| | - Rafael De Prado
- Department of Agricultural Chemistry and Edaphology, Campus of Rabanales, University of CordobaCordoba, Spain
| |
Collapse
|
8
|
Alcántara de la Cruz R, Barro F, Domínguez-Valenzuela JA, De Prado R. Physiological, morphological and biochemical studies of glyphosate tolerance in Mexican Cologania (Cologania broussonetii (Balb.) DC.). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2016; 98:72-80. [PMID: 26646239 DOI: 10.1016/j.plaphy.2015.11.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/29/2015] [Accepted: 11/16/2015] [Indexed: 05/26/2023]
Abstract
In recent years, glyphosate-tolerant legumes have been used as cover crops for weed management in tropical areas of Mexico. Mexican cologania (Cologania broussonetii (Balb.) DC.) is an innate glyphosate-tolerant legume with a potential as a cover crop in temperate areas of the country. In this work, glyphosate tolerance was characterized in two Mexican cologania (a treated (T) and an untreated (UT)) populations as being representatives of the species, compared in turn to a glyphosate-susceptible hairy fleabane (S) (Conyza bonariensis (L.) Cronq.) population. Experiments revealed that T and UT Mexican cologania populations had a higher tolerance index (TI), and a lower shikimic acid accumulation and foliar retention than the hairy fleabane S population. Absorption and translocation, leaf morphology and metabolism studies were only carried out in the Mexican cologania T population and the hairy fleabane S population. The latter absorbed 37% more (14)C-glyphosate compared to the Mexican cologania T at 96 h after treatment (HAT). Mexican cologania T translocated less herbicide from the treated leaf to the remainder of the plant than hairy fleabane S. The Mexican cologania T presented a greater epicuticular wax coverage percentage than the hairy fleabane S. This morphological characteristic contributed to the low glyphosate absorption observed in the Mexican cologania. In addition, the Mexican cologania T metabolized glyphosate mainly into AMPA, formaldehyde and sarcosine. These results indicate that the high glyphosate tolerance observed in Mexican cologania is mainly due to the poor penetration and translocation of glyphosate into the active site, and the high glyphosate degradation into non-toxic substances.
Collapse
Affiliation(s)
| | - Francisco Barro
- Institute for Sustainable Agriculture, Spanish National Research Council (IAS-CSIC), E-14004, Córdoba, Spain
| | | | - Rafael De Prado
- Department of Agricultural Chemistry and Edaphology, University of Cordoba, E-14071, Cordoba, Spain
| |
Collapse
|
9
|
Sánchez-Martín J, Heald J, Kingston-Smith A, Winters A, Rubiales D, Sanz M, Mur LAJ, Prats E. A metabolomic study in oats (Avena sativa) highlights a drought tolerance mechanism based upon salicylate signalling pathways and the modulation of carbon, antioxidant and photo-oxidative metabolism. PLANT, CELL & ENVIRONMENT 2015; 38:1434-52. [PMID: 25533379 DOI: 10.1111/pce.12501] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 12/15/2014] [Accepted: 12/15/2014] [Indexed: 05/02/2023]
Abstract
Although a wealth of information is available on the induction of one or several drought-related responses in different species, little is known of how their timing, modulation and crucially integration influence drought tolerance. Based upon metabolomic changes in oat (Avena sativa L.), we have defined key processes involved in drought tolerance. During a time course of increasing water deficit, metabolites from leaf samples were profiled using direct infusion-electrospray mass spectroscopy (DI-ESI-MS) and high-performance liquid chromatography (HPLC) ESI-MS/MS and analysed using principal component analysis (PCA) and discriminant function analysis (DFA). The involvement of metabolite pathways was confirmed through targeted assays of key metabolites and physiological experiments. We demonstrate an early accumulation of salicylic acid (SA) influencing stomatal opening, photorespiration and antioxidant defences before any change in the relative water content. These changes are likely to maintain plant water status, with any photoinhibitory effect being counteracted by an efficient antioxidant capacity, thereby representing an integrated mechanism of drought tolerance in oats. We also discuss these changes in relation to those engaged at later points, consequence of the different water status in susceptible and resistant genotypes.
Collapse
Affiliation(s)
| | - Jim Heald
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, SY23 3DA, UK
| | - Alison Kingston-Smith
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, SY23 3DA, UK
| | - Ana Winters
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, SY23 3DA, UK
| | - Diego Rubiales
- Institute for Sustainable Agriculture, CSIC, Apdo. 4084, Córdoba, 14080, Spain
| | - Mariluz Sanz
- Institute of General Organic Chemistry, CSIC, Juan de la Cierva 3, Madrid, 28006, Spain
| | - Luis A J Mur
- Institute of Biological, Environmental and Rural Sciences, University of Aberystwyth, Aberystwyth, SY23 3DA, UK
| | - Elena Prats
- Institute for Sustainable Agriculture, CSIC, Apdo. 4084, Córdoba, 14080, Spain
| |
Collapse
|
10
|
Bai YR, Yang P, Su YY, He ZL, Ti XN. Effect of exogenous methanol on glycolate oxidase and photorespiratory intermediates in cotton. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:5331-5338. [PMID: 25053644 PMCID: PMC4400538 DOI: 10.1093/jxb/eru294] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 06/09/2014] [Accepted: 06/10/2014] [Indexed: 06/03/2023]
Abstract
Application of methanol (MeOH) inhibits photorespiration and enhances growth and yield in C3 plants. However, the underlying cellular and molecular mechanisms are not clear. In this study, we investigated the effects of foliar application of MeOH (30%, v/v) on glycolate oxidase (GO) activity and photorespiratory intermediates in cotton leaves in a field experiment. MeOH treatment significantly inhibited GO activity (by 30% compared with the controls). We also found that endogenous glyoxylate, a photorespiratory intermediate, increased and glycine decreased significantly in MeOH-treated plants. Serine increased significantly in MeOH-treated plants. These results thus demonstrated that exogenous MeOH can modulate GO activity and the production of photorespiratory intermediates, and sheds new lights on our current understanding of how exogenous MeOH inhibits photorespiration and enhances the growth and yield of C3 plants such as cotton.
Collapse
Affiliation(s)
- Yan-Ru Bai
- Laboratory of Chemical Biology, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China
| | - Ping Yang
- Laboratory of Chemical Biology, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China
| | - Yuan-Yuan Su
- Laboratory of Chemical Biology, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China
| | - Zong-Ling He
- Laboratory of Chemical Biology, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China
| | - Xiao-Nan Ti
- Laboratory of Chemical Biology, College of Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China
| |
Collapse
|
11
|
Rojano-Delgado AM, Luque de Castro MD. Capillary electrophoresis and herbicide analysis: Present and future perspectives. Electrophoresis 2014; 35:2509-19. [DOI: 10.1002/elps.201300556] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 04/16/2014] [Accepted: 04/23/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Antonia María Rojano-Delgado
- Department of Agricultural Chemistry and Soil Science; Córdoba Spain
- Campus of Rabanales, and Agroalimentary Excellence Campus; ceiA3, University of Córdoba; Córdoba Spain
| | - María D. Luque de Castro
- Department of Analytical Chemistry; Córdoba Spain
- Campus of Rabanales, and Agroalimentary Excellence Campus; ceiA3, University of Córdoba; Córdoba Spain
| |
Collapse
|
12
|
Luque de Castro M, Delgado-Povedano M. Ultrasound: A subexploited tool for sample preparation in metabolomics. Anal Chim Acta 2014; 806:74-84. [DOI: 10.1016/j.aca.2013.10.053] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 10/24/2013] [Accepted: 10/28/2013] [Indexed: 12/01/2022]
|
13
|
González-Torralva F, Rojano-Delgado AM, Luque de Castro MD, Mülleder N, De Prado R. Two non-target mechanisms are involved in glyphosate-resistant horseweed (Conyza canadensis L. Cronq.) biotypes. JOURNAL OF PLANT PHYSIOLOGY 2012; 169:1673-9. [PMID: 22841626 DOI: 10.1016/j.jplph.2012.06.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 05/28/2012] [Accepted: 06/22/2012] [Indexed: 06/01/2023]
Abstract
The physiological and biochemical bases for glyphosate resistance and susceptibility in horseweed (Conyza canadensis L. Cronq.) populations collected from Córdoba, Huelva, Málaga, Jaén and Seville in southern Spain were investigated. Screening 25 populations treated with glyphosate (238gacidequivalentha(-1)) at the rosette stage (BBCH 14-15) revealed reductions in fresh weight (fw) of 9-99%. The resistant biotype (R C004) was 6.1 times more resistant than the susceptible biotype (S). Shikimate accumulation in both biotypes increased until 72h after treatment (HAT), and then continued to increase (to 61.2%) in the S biotype, but decreased by 40% in the R (C004) biotype. Differential glyphosate spray retention and foliar uptake of applied (14)C-glyphosate between the R (C004) and S biotype had no effect on resistance to this herbicide. Quantitative and qualitative tests showed greater (14)C-glyphosate mobility in the S biotype than in the R (C004) biotype. Glyphosate was metabolized faster in the R (C004) biotype than in the S biotype. The herbicide disappeared completely from the R (C004) biotype by conversion into glyoxylate, sarcosine and aminomethylphosphonic acid within 96 HAT. On the other hand, 41.43nmolg(-1)fw of all glyphosate applied remained in the S biotype and glyoxylate was its only non-toxic metabolite. These results suggest that glyphosate resistance in horseweed is due to two different non-target mechanisms, namely: (a) impaired glyphosate translocation and (b) glyphosate metabolism to other compounds.
Collapse
|
14
|
González-Torralva F, Gil-Humanes J, Barro F, Brants I, De Prado R. Target site mutation and reduced translocation are present in a glyphosate-resistant Lolium multiflorum Lam. biotype from Spain. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2012; 58:16-22. [PMID: 22771431 DOI: 10.1016/j.plaphy.2012.06.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 06/04/2012] [Indexed: 05/25/2023]
Abstract
The resistance mechanism of a glyphosate-resistant Lolium multiflorum Lam. biotype collected in Córdoba (Southern Spain) was examined. Resistance Factor values at three different growth stages ranged between 4.77 and 4.91. At 96 hours after treatment (HAT) the S biotype had accumulated seven times more shikimic acid than the R biotype. There were significant differences in translocation of (14)C-glyphosate between biotypes, i.e. at 96 HAT, the R biotype accumulated in the treated leaf more than 70% of the absorbed herbicide, in comparison with 59.21% of the S biotype; the R biotype translocated only 14.79% of the absorbed (14)C-glyphosate to roots, while in the S population this value was 24.79%. Visualization of (14)C-glyphosate by phosphor imaging showed a reduced distribution in the R biotype compared with the S. Glyphosate metabolism was not involved in the resistance mechanism due to both biotypes showing similar values of glyphosate at 96 HAT. Comparison of the EPSPS gene sequences between biotypes indicated that the R biotype has a proline 182 to serine amino acid substitution. In short, the resistance mechanism of the L. multiflorum Lam. biotype is due to an impaired translocation of the herbicide and an altered target site.
Collapse
Affiliation(s)
- Fidel González-Torralva
- Department of Agricultural Chemistry and Edaphology, University of Córdoba, E-14071 Córdoba, Spain.
| | | | | | | | | |
Collapse
|
15
|
Li T, Zhou Y, Sun J, Wu K. Ultrasensitive Detection of Glyphosate Using CdTe Quantum Dots in Sol-Gel-Derived Silica Spheres Coated with Calix[6]arene as Fluorescent Probes. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/ajac.2012.31003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|