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Artigo
Clonal microplant production of Corymbia maculata: effect of chemical sterilisation, plant growth regulator, gas exchange, activated charcoal and lighting
(2023-05-29) Molinari, Letícia Vaz; Souza, Denys Matheus Santana Costa; Avelar, Maria Lopes Martins; Fernandes, Sérgio Bruno; Gonçalves, Douglas Santos; Carvalho, Dulcinéia de; Atala, Laura Ribeiro; Brondani, Gilvano Ebling
Corymbia maculata stands out for its resistance to biotic and abiotic stress and for its high-density wood, which is ideal for sawmills, sleepers, posts, firewood and charcoal. In vitro culture techniques can be used for large-scale clonal microplant production, given the difficulty in adventitious rooting via cutting or mini-cutting techniques. The aim of the work was to evaluate the in vitro multiplication, elongation and adventitious rooting stages of Corymbia maculata based on chemical sterilisation of the culture medium, plant growth regulators, gaseous exchange, activated charcoal and growth room lighting. Supplementation of active chlorine in culture medium reduced fungal and bacterial contamination. The best result for the in vitro multiplication stage was observed in the absence of active chlorine and 0.5 mg l−1 benzylaminopurine (BAP). In vitro shoot elongation in culture medium supplemented with 0.5 mg l−1 α-naphthaleneacetic acid (NAA), 0.001% or 0.003% active chlorine, and vessels sealed with a rigid polypropylene lid with one or three membranes was the most suitable. Glass flasks with porous membrane lids allowed gaseous exchange and favoured elongation and adventitious rooting. Microshoots treated with indole-3-butyric acid (IBA) for 48 h (pulse effect) in the absence of light and activated charcoal in the culture medium is recommended for in vitro adventitious rooting of Corymbia maculata.
Artigo
Climate zoning: identifying suitable regions for the occurrence of Alternaria Brown spot in tangerine trees in Brazil
(2023-11-20) Aparecido, Lucas Eduardo de Oliveira; Torsoni, Guilherme Botega; Lima, Rafael Fausto de; Baratti, Ana Claudia Costa; Rossi, Maíra Ferreira de Melo; Santos, Adão Felipe dos; Peche, Pedro Maranha
Background: Brazilian citrus farming has been migrating to nontraditional citrus-growing regions, which can be considered a challenge for citrus growers, as not all these areas are suitable for tangerine cultivation. Thus, the mapping of regions exhibiting favorable climatic conditions for Alternaria brown spot has become crucial in the selection of appropriate locations for the establishment of new orchards. This mapping enables the implementation of an avoidance strategy, which entails steering clear of areas where the disease is prevalent, aligning with fundamental principles of disease control. Results: Thus, this study seeks to zone areas with high and low climatic favorability for the occurrence of Alternaria brown spot in tangerine trees in Brazil. Historical climate data series from the NASA-POWER database were used for all municipalities in Brazil. Agrometeorological variables used to determine the development of Alternaria brown spot were average monthly air temperature (Tmean) and duration of leaf wetness period (LWD). Areas were considered unsuitable climatically when Tmean was <17 °C or >33 °C, relatively suitable when Tmean was between 13 °C and 33 °C and LWD <10%, and climatically suitable when Tmean was between 13 °C and 33 °C and LWD >10%. The states of Paraná, Santa Catarina and Rio Grande do Sul showed greater thermal amplitude within months and throughout the year. The southern region of the country has harsher winters, with minimum temperatures below 15 °C, which is unfavorable for the disease incidence. Conclusion: The states with the greatest favorability for Alternaria brown spot were Paraná, Santa Catarina, and Rio Grande do Sul, mainly from May to September. Rio Grande do Sul was the state in this region that showed the greatest favorability, as a consequence of leaf wetness exceeding 10 h. The main tangerine-producing regions in Brazil, including the southern part of Minas Gerais, the state of São Paulo and the metropolitan region of Porto Alegre, were mostly classified as relatively favorable areas for the occurrence of Alternaria brown spot. It is recommended that when establishing new tangerine orchards, regions with lower favorability for the occurrence of Alternaria brown spot, such as the North and Central-West regions of Brazil, particularly the states of Amazonas, Pará and Mato Grosso, should be selected. © 2023 Society of Chemical Industry.
Livro
Formação literária e mediação da leitura: caminhos possíveis
(Editora Educação Literária, 2026) Goulart, Ilsa do Carmo Vieira (org.); Souza, Renata Junqueira de (org.)
Livro
Práticas de alfabetização e letramento: entre ações e saberes
(e-Publicar, 2021) Goulart, Ilsa do Carmo Vieira (org.); Cabral, Giovanna Rodrigues (org.); Naves, Ludmila Magalhães (org.)
Livro
Leitura literária e contextos de letramento
(e-Publicar, 2021) Goulart, Ilsa do Carmo Vieira (org.); Cabral, Giovanna Rodrigues (org.); Naves, Ludmila Magalhães (org.)