Resumo -O objetivo deste trabalho foi avaliar os efeitos de fosfitos sobre a antracnose (Colletotrichum tamarilloi) em jiló, na pós-colheita. O crescimento micelial e a produção e a germinação de conídios foram avaliados após a aplicação dos sais de fosfitos de Ca, K, Mg, Zn e Cu, nas concentrações de 0,25, 0,50, 0,75, 1,00, 1,25, 1,50 e 1,75 g L -1 (in vitro), sobre o fungo C. tamarilloi. As doses 0,25, 0,75, 1,25 e 1,75 g L -1 afetaram os frutos no período pós-colheita. Avaliaram-se os atributos químicos e a possível resposta bioquímica. A dose de 1,50 g L -1 foi utilizada no controle da antracnose, em pós-colheita, após inoculação do fungo. In vitro, a concentração efetiva para a redução de 50% do crescimento micelial e da produção e da germinação de conídios (CE 50 ) foi alcançada para as menores concentrações do fosfito de K. Observou-se efeito linear quanto à redução da incidência da antracnose e ao aumento das atividades das enzimas oxidativas/reativas catalase, ascorbato peroxidase e polifenoloxidase. O fosfito de K foi o sal mais eficiente contra a antracnose, em frutos armazenados a 13±2°C e 24±2°C, e tem potencial para ser utilizado para o manejo desta doença.Termos para indexação: Colletotrichum tamarilloi, Solanum gilo, controle alternativo, patologia pós-colheita. Phosphites in the management of anthracnose on jiloAbstract -The objective of this work was to evaluate the effects of phosphites on anthracnose (Colletotrichum tamarilloi) on jilo at postharvest. Mycelial growth, and production and germination of conidia were evaluated after the application of Ca, K, Mg, Zn, and Cu phosphites at the doses of 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, and 1.75 g L -1 (in vitro) on the fungus C. tamarilloi. The doses 0.25, 0.75, 1.25, and 1.75 g L -1 affected fruit in the period postharvest. Chemical attributes and the possible biochemical response were evaluated. The dose of 1.50 g L -1 was used in the post-harvest management of anthracnose after fungus inoculation. In vitro, the effective concentration for 50% reduction of mycelial growth and of conidial production and germination (EC 50 ) was achieved for K phosphite lower concentrations. Linear effect was observed for the anthracnose incidence reduction and for the activity increase of oxidative/reactive catalase enzymes, ascorbate peroxidase, and polyphenoloxidase. Potassium phosphite was the most efficient salt against anthracnose, in stored fruit at 13±2°C and 24±2°C, and it has the potential to be used for this disease management.
The influence of two aromatic cytokinins (CKs), 6-benzylaminopurine (BAP) and meta-topolin (mT), on in vitro propagation and redox metabolism of sugarcane (Saccharum spp., variety RB98710) was investigated. Plants were cultured in Murashige and Skoog (MS) medium supplemented with mT (5 µmol.L-1) or BAP (5 or 6.66 µmol.L-1) for 40 days. The use of mT provided an increase in the multiplication rate and stem length of plants and shoots when compared to BAP. Shoots generated from the mT treatment presented low malondialdehyde (MDA) content and superoxide dismutase (SOD) activity, although they had higher hydrogen peroxide (H2O2) content. Thus, the H2O2 did not act as a stress marker, but it is related to plant growth and development processes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.