Photosynthetic performance or behavior in ‘Keitt’ mango under diurnal environmental fluctuations

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

doi:10.1590/1983-21252025v3813945rc

Autores

Ester dos Santos Coêlho Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-5541-1937
Elania Freire da Silva Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-7176-3609
Antonio Gideilson Correia da Silva Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-6403-5507
Anna Kézia Soares de Oliveira Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-7063-9991
Pablo Henrique de Almeida Oliveira Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-9128-6179
Lindomar Maria da Silveira Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-9719-7417
Aurélio Paes Barros Júnior Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-6983-8245
João Everthon da Silva Ribeiro Department of Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-1937-0066

DOI:

https://doi.org/10.1590/1983-21252025v3813945rc

Palavras-chave:

Mangifera indica. Estresses abióticos. Fotossíntese. Dano fotoinibitório. Plasticidade fenotípica.

Resumo

Fatores abióticos, como temperatura e irradiância, induzem diferentes respostas fisiológicas nas plantas ao longo do dia. Em árvores frutíferas, condições climáticas desfavoráveis afetam a assimilação líquida de CO₂ e a qualidade dos frutos. Portanto, os objetivos deste estudo foram avaliar o comportamento fotossintético da mangueira (Mangifera indica L.) cv. 'Keitt' ao longo do dia por meio da análise de trocas gasosas e fluorescência da clorofila a, determinar a predominância dos fatores abióticos (temperatura, umidade relativa e radiação) sobre essas respostas fisiológicas, e identificar a densidade de fluxo de fótons fotossinteticamente ativos (DFFFA) que promove maior assimilação de CO₂ e taxa de transporte de elétrons. O experimento foi conduzido em casa de vegetação em delineamento experimental inteiramente casualizado, no qual 18 diferentes densidades de fluxo de fótons fotossinteticamente ativos (DFFFA) (0 – 2000 μmol m^-2 s^-1) foram testadas em três horários diferentes ao longo do dia (8h, 12h e 16h). Cada combinação de densidade de fluxo e tempo foi repetida seis vezes, e em cada repetição, duas plantas por parcela foram consideradas. Variáveis ecofisiológicas (taxa líquida de fotossíntese, condutância estomática, transpiração e concentração interna de CO₂) e ambientais (temperatura, umidade relativa e radiação fotossinteticamente ativa) foram analisadas. As trocas gasosas e a fluorescência da clorofila da manga cv. 'Keitt' foram afetadas negativamente por condições de alta temperatura e radiação fotossinteticamente ativa. O DFFFA na faixa entre 1600 e 2000 μmol m^-2 s^-1 proporcionou uma maior taxa de fotossíntese líquida e taxa de transporte de elétrons na manga cv. 'Keitt' às 8h.

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