COLORED LED REDUCES ENERGY USE, AFFECTING LETTUCE SEED GERMINATION, GROWTH, AND ANTIOXIDANT ACTIVITY POSITIVELY

Ana Luiza Reale; Heloisa Santos; Giovani Tirelli; Leticia Moreno; Wilson Pereira; Elisa Bicalho

doi:10.17765/2176-9168.2024v17n.Especial.e12444

Autores/as

Ana Luiza Reale Universidade Federal de Lavras - UFLA https://orcid.org/0000-0002-6699-1981
Heloisa Santos Universidade Federal de Lavras - UFLA https://orcid.org/0000-0003-1384-4969
Giovani Tirelli Universidade Federal de Lavras - UFLA https://orcid.org/0000-0003-1560-9700
Leticia Moreno Universidade Federal de Lavras - UFLA https://orcid.org/0000-0002-1440-0756
Wilson Pereira Universidade Federal de Lavras - UFLA https://orcid.org/0000-0002-7931-8382
Elisa Bicalho Universidade Federal de Lavras - UFLA https://orcid.org/0000-0003-1746-0663

DOI:

https://doi.org/10.17765/2176-9168.2024v17n.Especial.e12444

Palabras clave:

Antioxidant system, Lactuca sativa, Light emitting diode, Photooxidation, Seed quality

Resumen

As vegetables have been growing and space has gathered on the market, there is increasing demand for alternative light sources. This research aimed to analyze the possible changes in lettuce (Lactuca sativa) seed germination and initial seedling growth under different light spectra. Seeds were germinated in a chamber at 20°C under a 12-hour photoperiod. The light treatment in the first phase consisted of white and colored light-emitting diode (LED) lights (red-V + blue-A) in proportions of 100% V, 80% V + 20% A, 50% V + 50% A, and 80% A + 20% V. The first phase of the experiment consisted of a completely randomized design in a 2x4 factorial scheme (two light conditions and four seed lots) with four replications. The first count, germination, germination speed index (GSI), root length, shoot length, total seedling length, and shoot-to-root ratio were evaluated via image analysis. For the second phase of the experiment, the quantification of antioxidative enzyme activity (SOD, CAT, and APX) was performed to assess whether the light treatments (white LED light, colored LED light, and fluorescent light) caused photooxidative damage in the seedlings. Compared with white LED light, colored LED light improved plant germination and growth by promoting faster radicle protrusion, a greater GSI, a longer total seedling length, and a longer primary root length. The quantification of SOD, CAT, and APX activity indicated that the quality of light used in this work did not cause photooxidative stress in lettuce plants.

Biografía del autor/a

Ana Luiza Reale, Universidade Federal de Lavras - UFLA

Mestra em Agronomia (Fitotecnia) pela Universidade Federal de Lavras (UFLA).

Heloisa Santos, Universidade Federal de Lavras - UFLA

Doutora em Agronomia (Fitotecnia) pela Universidade Federal de Lavras (UFLA). Docente adjunta da Universidade Federal de Lavras (UFLA), Lavras, MG, Brasil.

Giovani Tirelli, Universidade Federal de Lavras - UFLA

Mestrando em Agronomia pela Universidade Federal de Lavras (UFLA).

Leticia Moreno, Universidade Federal de Lavras - UFLA

Doutora em Agronomia pela Universidade da Georgia - Campus Tifton, GA, EUA.

Wilson Pereira, Universidade Federal de Lavras - UFLA

Doutor em Agronomia (Fitotecnia) pela Universidade Federal de Lavras (UFLA).

Elisa Bicalho, Universidade Federal de Lavras - UFLA

Doutora em Biologia Vegetal pela Universidade Federal de Minas Gerais (UFMG). Docente permanente do Programa de Pós-Graduação em Fisiologia Vegetal da UFLA, Lavras, MG, Brasil.

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