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Light condition, flask sealing, and cultivation time on the germination and initial in vitro development of Dendrobium nobile Lindl

Abstract One of the obstacles for the production of Orchidaceae plants is the seed propagation. Thus, in in vitro cultivation, luminosity and the type of sealing of the bottles are factors that influence germination and initial development of orchids. Therefore, the objective was to evaluate the lig...

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Published in:Ornamental Horticulture (Campinas) 2022-12, Vol.28 (4), p.407-413
Main Authors: Ribeiro, Isabella de Souza, Ribeiro, Luan Marlon, Soares, Jackeline Schultz, Ramos, Jéssica Celeste Mônico, Sorgato, José Carlos
Format: Article
Language:English
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Summary:Abstract One of the obstacles for the production of Orchidaceae plants is the seed propagation. Thus, in in vitro cultivation, luminosity and the type of sealing of the bottles are factors that influence germination and initial development of orchids. Therefore, the objective was to evaluate the light condition, the type of sealing of the bottles and the evaluation time in germination and initial in vitro development of Dendrobium nobile Lindl. After sowing, cultures were subjected to two irradiance conditions according to the sealing of the flasks: 7.0 µmol m-2 s-1 (threaded cap) and 19.0 µmol m-2 s-1 (plastic film) and two light conditions: white fluorescent lamp and red fluorescent lamp. At 30, 60 and 90 days, the percentage of germination, survival, of protocorms in stage 1, stage 2, stage 3 and stage were evaluated 4. DIC was used, in a sub-divided plot scheme for 30 and 60 days after sowing and in a 2 x 2 factorial scheme at 90 days. The highest germination percentage was observed when using white fluorescent lamp with a plastic film cover (70.33%) and at 30 days (70.13%). The highest survival percentage (100%) was observed when using plastic film cover and white fluorescent lamp at 90 days. The greatest development of propagules, reaching stage 4 was verified in the red fluorescent lamp with threaded cap (9.55%). Resumo Um dos obstáculos para produção de plantas de Orchidaceae é a propagação por sementes. Dessa forma, no cultivo in vitro a luminosidade e o tipo de vedação dos frascos são fatores que influenciam a germinação e o desenvolvimento inicial de orquídeas. Sendo assim, objetivou-se avaliar a condição de luz, o tipo de vedação dos frascos e o tempo de avaliação na germinação e desenvolvimento inicial in vitro de Dendrobium nobile Lindl. Após semeadura, as culturas foram submetidas à duas condições de irradiâncias conforme a vedação dos frascos: 7,0 µmol m-2 s-1 (tampa rosqueável) e 19,0 µmol m-2 s-1 (filme plástico) e duas condições de luz: lâmpada fluorescente branca e lâmpada fluorescente vermelha. Aos 30, 60 e 90 dias foi avaliado a porcentagem de germinação, de sobrevivência, de protocormos em estádio 1, estádio 2, estádio 3 e estádio 4. Foi utilizado DIC, em esquema de parcelas sub-subdivididas para 30 e 60 dias após semeadura e em esquema fatorial 2 x 2 aos 90 dias. A maior porcentagem de germinação foi observada quando se utilizou lâmpada fluorescente branca com tampa de filme plástico (70,33%) e aos 30 dias (70,13%). A maior porcenta
ISSN:2447-536X
2447-536X
DOI:10.1590/2447-536x.v28i4.2515