Palavras-chave
Luz
Pigmentos
Fotossíntese
Crescimento.
Como Citar
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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