| Texto completo | |
| Autor(es): |
Alcantara-de la Cruz, Ricardo
[1]
;
Amaral, Gabriel da Silva
[1]
;
de Oliveira, Guilherme Moraes
[2]
;
Rufino, Luiz Renato
[3]
;
de Azevedo, Fernando Alves
[4]
;
de Carvalho, Leonardo Bianco
[5]
;
das Gracas Fernandes da Silva, Maria Fatima
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos - Brazil
[2] Univ Fed Sao Carlos, Ctr Ciencias Biol & Saude, BR-13565905 Sao Carlos - Brazil
[3] Univ Fed Sao Carlos, Ctr Ciencias Agr, Campus Araras, BR-13604900 Araras - Brazil
[4] Inst Agron Campinas IAC, Ctr Citricultura Sylvio Moreira, BR-13490970 Cordeiropolis - Brazil
[5] Sao Paulo State Univ, Sch Agr & Vet Sci, UNESP, BR-14884900 Jaboticabal - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | AGRICULTURE-BASEL; v. 10, n. 7 JUL 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
Glyphosate is the main tool for weed management in Brazilian citrus orchards, where weeds, such asConyza bonariensisandDigitaria insularis, have been found with resistance to this herbicide. Field prospections have allowed the identification of a possible new case of glyphosate resistance. In this work, the susceptibility levels to glyphosate on threeAmaranthus viridisL. populations, with suspected resistance (R1, R2, and R-IAC), collected in citrus orchards from the Sao Paulo State, Brazil, as well as their accumulation rates of shikimic acid, were determined. The fresh weight of the susceptible population (S) was reduced by 50% (GR(50)) with similar to 30 g ea ha(-1)glyphosate, while the GR(50)values of the R populations were between 5.4 and 11.3 times higher than that for S population. The LD50 (herbicide dose to kill 50% of individuals of a weed population) values of the S population were <= 150 g ea ha(-1) glyphosate, while the LD(50)of the R populations ranged from 600 to 920 g ea ha(-1). Based on the reduction of fresh weight and the survival rate, the R1 population showed the highest level of glyphosate resistance, which had GR(50) and LD50 values of 248 and 918 g ea ha(-1)glyphosate, respectively. The S population accumulated 240 mu g shikimic acid at 1000 mu M glyphosate, while the R1, R2, and R-IAC populations accumulated only 16, 43, and 33 mu g shikimic acid, respectively (between 5.6 to 15 times less than the S population). Enzyme activity assays suggested that at least one target site-type mechanism was involved in resistance. This result revealed the first report of glyphosate resistance inA. viridisreported in the world. (AU) | |
| Processo FAPESP: | 14/50918-7 - INCT 2014: para o Controle Biorracional de Insetos Pragas e Fitopatógenos |
| Beneficiário: | Maria Fátima das Graças Fernandes da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/15527-0 - Quantificação e atividade enzimática da 5-enolpiruvil-shiquimato-3-fosfato sintase em plantas daninhas resistentes ao glyphosate |
| Beneficiário: | Guilherme Moraes de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 18/15910-6 - Controle biorracional de inseto pragas e fitopatógenos |
| Beneficiário: | Ricardo Alcántara de la Cruz |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |