Phenotypic and biochemical responses of sugarcane cultivars to glyphosate application

Autor(es)

Adriano, Rodrigo Cabral ^[1] ; Mathias Azania, Carlos Alberto ^[1] ; Pinto, Luciana Rossini ^[1] ; de Padua Mathias Azania, Andrea Aparecida ^[1] ; Perecin, Dilermando ^[2]

Afiliação do(s) autor(es)

^[1] IAC Ctr Cana De Acucar, BR-14001970 Ribeirao Preto, SP - Brazil

^[2] Univ Estadual Paulista, Depto Ciencias Exatas, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SUGAR TECH; v. 15, n. 2, p. 127-135, JUN 2013.
• Citações Web of Science: 1

Resumo

Sugarcane cultivars show varying degrees of herbicide susceptibility, with herbicide effects ranging from no injury to total plant eradication. In this study, phenotypic and biochemical responses to glyphosate were evaluated in three sugarcane cultivars. Herbicide tolerance of the three cultivars (IACSP93-3046, IACSP94-4004 and RB72454) was tested in a greenhouse experiment using a completely randomized design. The experiment consisted of four replications of treatments in a factorial arrangement of 3 cultivars x 6 glyphosate dosages (0, 1,440, 2,160, 2,880, 3,600 and 4,320 g a. e. ha(-1)). Intoxication symptoms, based on a percentage scale ranging from 0 (no injury) to 100 % (total plant death), and total chlorophyll content were recorded at 1, 2, 3, 6, 7, 10, 20 and 34 days after glyphosate application (DAA). Shikimate dehydrogenase and alpha-esterase isoenzyme assays were performed at 8, 24, 48, 72 and 144 h after application (HAA). Intoxication symptoms observed at 6 DAA ranged from 5 % at the lowest glyphosate dosage (1,440 g a. e. ha(-1)) to similar to 30 % at the highest dosage (4,320 g a. e. ha(-1)) across all cultivars. IACSP94-4004 and IACSP93-3046 were determined to be the most glyphosate-tolerant cultivars. Reduction in chlorophyll content was observed with high dosages of glyphosate at 6 DAA. The shikimate dehydrogenase banding pattern was generally conserved among cultivars and treatments, with the exception of the IACSP94-4004 cultivar, which showed alterations in the banding pattern of alpha-esterase after glyphosate application. (AU)

• Processo FAPESP: 10/09016-9 - Resposta de cultivares de cana-de-açúcar a erradicação química avaliada por características morfologicas, fisiologicas e marcadores isoenzimaticos
• Beneficiário: Carlos Alberto Mathias Azania
• Modalidade de apoio: Auxílio à Pesquisa - Regular