Suplementação luminosa com LED para o cultivo de plantas de duas variedades de petúnia: aspectos fisiológicos e produtivos

Autores

DOI:

https://doi.org/10.5433/1679-0359.2025v46n6p1767

Palavras-chave:

Petunia × hybrida, Luz, Pigmentos, Fotossíntese, Crescimento.

Resumo

O objetivo deste estudo foi investigar os efeitos da suplementação luminosa (SL) sobre plantas de duas variedades de Petunia × hybrida (Miliflora – FlashForward - White e Pendula Plush - Red) frente ao cultivo sob luz natural. Foram utilizados diodos emissores de luz (LED) com duas combinações de luz azul (A) e vermelha (V), sendo: 15%A+85%V e 85%A+15%V, e luz branca (B), com intensidade luminosa aproximada de 25 µmol m-2 s-1. O experimento foi conduzido em estufa de cultivo e o fornecimento diário da SL acompanhou o fotoperíodo da região de Pelotas-RS, ocorrendo desde a semeadura até a fase de plantas adultas em florescimento pleno. Foram realizadas avaliações do índice de pigmentos fotossintéticos, trocas gasosas e análises biométricas das plantas. As duas combinações de luz azul e vermelha não proporcionaram diferenças significativas nos índices de pigmentos ou na taxa fotossintética líquida em comparação ao cultivo sob luz natural. As fontes de SL 85%A + 15%V e 100%B promoveram maior massa seca de ramificações das plantas da variedade White e massa seca de flores e botões florais das plantas da variedade Red. Por outro lado, a luz branca (100%B) aumentou o número de flores abertas por planta da variedade White. No entanto, as três fontes de suplementação apresentaram desempenho similar ao da luz natural no crescimento da planta inteira (parte aérea e radicular).

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Biografia do Autor

Viviane Mülech Ritter, Universidade Federal de Pelotas

Dra. em Agronomia, Programa de Pós-Graduação em Sistemas de Produção Agrícola Familiar, Universidade Federal de Pelotas, UFPEL, Pelotas, RS, Brasil.

Roberta Marins Nogueira Peil, Universidade Federal de Pelotas

Prof. Dr., Departamento de Fitotecnia, UFPEL, Pelotas, RS, Brasil.

Sidnei Deuner, Universidade Federal de Pelotas

Prof. Dr., Departamento de Botânica, UFPEL, Pelotas, RS, Brasil.

Paulo Roberto Grolli, Universidade Federal de Pelotas

Prof. Dr., Departamento de Fitotecnia, UFPEL, Pelotas, RS, Brasil.

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Publicado

2025-11-28

Como Citar

Ritter, V. M., Peil, R. M. N., Deuner, S., & Grolli, P. R. (2025). Suplementação luminosa com LED para o cultivo de plantas de duas variedades de petúnia: aspectos fisiológicos e produtivos. Semina: Ciências Agrárias, 46(6), 1767–1784. https://doi.org/10.5433/1679-0359.2025v46n6p1767

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