Data/hora: 16/06/2024 08:19:40

Biblioteca(s): | Epagri-Sede.
Data corrente: | 06/09/2019
Data da última atualização: | 06/09/2019
Autoria: | AUCIQUE-PÉREZ, C. E.; RESENDE, R. S.; CRUZ NETO, L. B.; DORNELAS, F.; DAMATTA, F. M.; RODRIGUES, F. Á.
Título: | Picolinic acid spray stimulates the antioxidative metabolism and minimizes impairments on photosynthesis on wheat leaves infected by Pyricularia oryzae.
Ano de publicação: | 2019
Fonte/Imprenta: | Physiologia Plantarum , EUA, 165, n.165, 2019.
Idioma: | Inglês
Conteúdo: | Fungal pathogens produce toxins that are important for their pathogenesis and/or aggressiveness towards their hosts. Picolinic acid (PA), a non&#8208;host selective toxin, causes lesions on rice leaves resembling those originated from Pyricularia oryzae infection. Considering that non&#8208;host selective toxins can be useful for plant diseases control, this study investigated whether the foliar spray with PA on wheat (Triticum aestivum L.) plants, in a non&#8208;phytotoxic concentration, could increase their resistance to blast, stimulate the anti&#8208;oxidative metabolism, and minimize alterations in photosynthesis. The PA spray at concentrations greater than 0.1 mg&#8201;ml&#8722;1 caused foliar lesions, compromised the photosynthesis and was linked with greater accumulation of hydrogen peroxide (H2O2) and superoxide anion radical (O2?&#8722;). Fungal mycelial growth, conidia production and germination decreased by PA at 0.3 mg&#8201;ml&#8722;1. Blast severity was significantly reduced by 59 and 23%, respectively, at 72 and 96&#8201;h after inoculation for plants sprayed with PA (0.1 mg&#8201;ml&#8722;1) at 24&#8201;h before fungal inoculation compared to non&#8208;sprayed plants. Reduction on blast symptoms was linked with increases on ascorbate peroxidase (EC 1.11.1.11), catalase (EC 1.11.1.6), glutathione peroxidase (EC 1.11.1.9), glutathione reductase (EC 1.8.1.7), glutathione&#8208;S&#8208;transferase (EC 2.5.1.18), peroxidase (EC 1.11.1.7), and superoxide dismutase (EC 1.15.1.1) activities, lower H2O2 and O2?&#8722; accumulation, reduced malondialdehyde production as well as less impairments to the photosynthetic apparatus. A more efficient antioxidative metabolism that rapidly scavenges the reactive oxygen species generated during P. oryzae infection, without dramatically decreasing the photosynthetic performance, was a remarkable effect obtained with PA spray
Palavras-Chave: | photosynthesis; Pyricularia oryzae; rice.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_43052.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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