Density of photosynthetically active photons and its influence on the physiological aspects of Alternanthera brasiliana

Gisele Lopes dos Santos; João Everthon da Silva Ribeiro; Pablo Henrique de Almeida Oliveira; Ester dos Santos Coêlho; Antonio Gideilson Correia da Silva; Elania Freire da Silva; Anna Kézia Soares de Oliveira; Aurélio Paes Barros Júnior

doi:10.1590/1983-21252025v3812965rc

Autores

Gisele Lopes dos Santos Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-1134-4672
João Everthon da Silva Ribeiro Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-1937-0066
Pablo Henrique de Almeida Oliveira Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-9128-6179
Ester dos Santos Coêlho Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-5541-1937
Antonio Gideilson Correia da Silva Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-6403-5507
Elania Freire da Silva Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-7176-3609
Anna Kézia Soares de Oliveira Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-7063-9991
Aurélio Paes Barros Júnior Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-6983-8245

DOI:

https://doi.org/10.1590/1983-21252025v3812965rc

Palavras-chave:

Amaranthaceae. Trocas gasosas. Fluorescência da clorofila. Intensidade luminosa. Fotossíntese.

Resumo

A densidade de fluxo de fótons fotossinteticamente ativos desempenha um papel crucial na regulação do desempenho fotossintético e dos processos fisiológicos das plantas. No entanto, sua influência sobre os aspectos fisiológicos de Alternanthera brasiliana ainda é pouco compreendida. Nessa perspectiva, este estudo buscou investigar os efeitos de diferentes densidades de fluxo de fótons sobre as trocas gasosas e a fluorescência da clorofila a, e identificar a PPFD que promove maior assimilação de CO₂ e aumento na taxa de transporte de elétrons em A. brasiliana. O delineamento experimental foi inteiramente casualizado, com seis repetições. Os tratamentos foram compostos por densidades de fluxo de fótons fotossinteticamente ativos (PPFD) (0; 25; 50; 75; 100; 125; 150; 175; 200; 400; 600; 800; 1.000; 1.200; 1.400; 1.600; 1.800 e 2.000 μmol m^-2 s^-1) avaliados em três horários do dia (8 a.m., 12 p.m. e 4 p.m.). Os processos fisiológicos de A. brasiliana apresentaram variações significativas em resposta à densidade de fluxo de fótons e às condições ambientais ao longo do dia. Um aumento da PPFD para 2.000 µmol m⁻² s⁻¹, observado às 8h, resultou na maximização das trocas gasosas e das variáveis de fluorescência da clorofila a. Já às 12h, período caracterizado pela maior temperatura (35,01ºC) e menor umidade relativa do ar (44,95%), uma PPFD de 1.800 µmol m⁻² s⁻¹ favoreceu uma maior assimilação de CO₂ e um aumento na taxa de transporte de elétrons. Esses resultados ressaltam o papel crucial da densidade de fluxo de fótons na regulação dos processos fisiológicos da espécie.

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