Photochemical Efficiency and Leaf Carbohydrates of Theobroma cacao L. Genotypes Under Different Light Regimes and Cultivation Systems
Jan da Vitória, Vinicius de Souza Oliveira, Ariane Tercio Guasti, Marcos Antônio Cezario Dias, Carla da Silva Dias, Enilton Nascimento de Santana, Karin Tesch Kuhlcamp, Lúcio de Oliveira Arantes, José Altino Machado Filho, Renan Batista Queiroz, Carlos Alberto Spaggiari Souza
TL;DR
This study evaluates how different cacao genotypes respond to various cultivation systems and light conditions, identifying the most adaptable ones for different environments.
Contribution
The study identifies specific cacao genotypes that maintain photosynthetic efficiency and carbohydrate levels across different cultivation systems and light regimes.
Findings
Genotypes PH16 and PS1319 showed stable photosynthetic performance in agroforestry, cabruca, and full-sun systems.
PH16 and PS1319 had higher glucose, sucrose, and fructose levels in both shaded and full-sun environments.
CEPEC 2002 showed the highest photosynthetic pigments in the cabruca system.
Abstract
The cacao tree is naturally adapted to shade; however, cultivation in full-sun systems is becoming increasingly common. However, high light intensity can damage the photosynthetic apparatus, making the choice of genotype fundamental to the success of the crop. Thus, in the north of the state of Espírito Santo, municipality of Linhares, the physiological and biochemical responses of the cacao genotypes PS1319, CEPEC 2002, and PH16 were evaluated in agroforestry, cabruca, and full sun cultivation systems during the months of April to October. To this end, chlorophyll a fluorescence, photosynthetic pigments, and carbohydrates were evaluated using a completely randomized split-plot experimental design. Across agroforestry, cabruca (a traditional Brazilian shaded system), and full-sun systems, the cacao genotypes PH16, PS1319, and CEPEC 2002 did not show limitations in photosynthetic…
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Taxonomy
TopicsCocoa and Sweet Potato Agronomy · Food Chemistry and Fat Analysis · Sugarcane Cultivation and Processing