| Texto completo | |
| Autor(es): |
Cerveira Junior, Wilson Roberto
[1]
;
Santos da Costa, Yanna Karoline
[1]
;
Carbonari, Caio Antonio
[2]
;
Duke, Stephen Oscar
[3]
;
da Costa Aguiar Alves, Pedro Luis
[1]
;
de Carvalho, Leonardo Bianco
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ, Sch Agr & Vet Sci, UNESP, BR-14884900 Jaboticabal, SP - Brazil
[2] Sao Paulo State Univ, Sch Agr, UNESP, BR-18610307 Botucatu, SP - Brazil
[3] USDA, NPURU Nat Prod Utilizat Res Unit, University, MS 38677 - USA
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | FOREST ECOLOGY AND MANAGEMENT; v. 470, AUG 15 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
We hypothesized that eucalyptus has clone-dependent responses to glyphosate, and such differential responses might be associated with morphological, metabolic and/or photosynthetic changes. Experiments were carried out under controlled conditions of temperature, photoperiod and nutrition, focusing on evaluating the response of Eucalyptus x urograndis clones (GG100 and 1144) to increasing doses of glyphosate (0-1440 g ha(-1) acid equivalent - AE) and to WA whether a differential plant response would be associated to alterations in leaf morphology, plant and herbicide metabolism and photosynthesis. There was a significant reduction of plant height, stem diameter, number of leaves, leaf area and shoot dry mass caused by low doses of glyphosate (<= 180 g AE ha(-1), while a strong plant growth reduction (similar to 60%) was caused by glyphosate field doses (>= 720 g AE ha(-1)), in both clones. The GG100 clone was more susceptible to glyphosate field doses, while the 1144 clone was more susceptible to glyphosate low doses. The stomatal index increased by 31% and the nervure thickness was reduced by 17% at 30 days after application of glyphosate at 180 g AE ha(-1) (DAA) in the GG100 clone. Traces of glyphosate (< 28 g mg(-1 )of dry mass) were found in leaf tissues of both clones at 1 DAA. Shikimic acid accumulated earlier (after 1 DAA) and in greater amounts (90%) in the 1144 clone. Aminomethylphosphonic acid (AMPA) was not detected in either treated clone. The CO2 assimilation rate, transpiration rate and stomatal conductance were reduced earlier (after 1 DAA) and more intensely (65%) in the 1144 clone. The clone-dependent response is apparently associated with changes in plant metabolism related to glyphosate mode of action and gas exchange response differences between the clones. (AU) | |
| Processo FAPESP: | 11/00031-8 - Resposta fotossintética e metabólica do eucalipto à pulverização de glyphosate |
| Beneficiário: | Leonardo Bianco de Carvalho |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |