Papaya growth under irrigation depths and brassinosteroid application

• Autor(a) principal: Souza, Joilma Maria de
• Data de Publicação: 2021
• Outros Autores: Sousa, Valéria Fernandes de Oliveira, Santos, Gisele Lopes dos, Silva, Jeneilson Alves da, Maia, Josemir Moura, Barboza, Jonathan Bernardo, Costa, José Eldo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Diversitas Journal
• Texto Completo: https://diversitasjournal.com.br/diversitas_journal/article/view/1863
• topic: Carica papaya L., déficit hídrico, fitohormônio.

Brassinosteroid is a hormone that in addition to favoring the growth and development of the plant is pointed out as attenuator of the negative effects caused by water stress in vegetables. The papaya has socioeconomic importance and the water deficit is a limiting factor to its growth, therefore, it was aimed to evaluate the effects caused by the application of epibrassinolide (C28H48O6), a brassinosteroid analogue, during the vegetative phase of the papaya under different irrigation slides. The experiment was conducted in the experimental field belonging to the State University of Paraíba, Catolé do Rocha -PB campus, using the Hawaí variety. In factorial scheme 5x2, with four blocks and five irrigation slides (60, 80, 100, 120, 140% of reference evapotranspiration-ET0), with brassinosteroid (concentration 1.0 mg L-1) and without brassinosteroid. The hormone was applied via the leaves at 60 days after transplanting for two consecutive days, this procedure being carried out inside a closed chamber and using a manual sprayer, 35 days after the complete exposure of the plants to the treatments, parameters were evaluated. at which it was found that there was a significant interactive effect between the factors studied (blades x hormone) in most of the variables evaluated. Smaller irrigation depths promoted lower height, diameter, number of leaves, leaf area and root volume of papaya seedlings. The use of 100% of the reference evapotranspiration provided greater height, stem and root moisture. The application of 1.0 mg L-1 of the hormone optimized plant growth in the seedling production phase, however, it did not alleviate the harmful effects of the water deficit. KEYWORDS: Carica papaya L., water deficit, phytohormone