Photosynthetic Assimilation of the Guava (<i>Psidium guajava</i>) cv. Paluma under Different Pruning and Fruit Thinning Intensities
Adaniel Sousa dos Santos,
Gustavo Alves Pereira,
Wéverson Lima Fonseca,
Alan Mario Zuffo,
Jenilton Gomes da Cunha,
Nemilda Pereira Soares,
Estefenson Marques Morais,
Antônio Afonso Sousa do Nascimento,
Djavan Pinheiro Santos,
Murilo de Sousa Almeida,
Jorge González Aguilera,
Luis Morales-Aranibar,
Eliseo Pumacallahui Salcedo,
Richar Marlon Mollinedo Chura,
Wilberth Caviedes Contreras,
Roger Ccama Alejo
Affiliations
Adaniel Sousa dos Santos
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Gustavo Alves Pereira
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Wéverson Lima Fonseca
Departamento de Agropecuária, Universidade Federal do Piauí, Colégio Técnico de Bom Jesus (CTBJ), Bom Jesus 59270-000, PI, Brazil
Alan Mario Zuffo
Departamento de Agronomia, Universidade Estadual do Maranhão, Balsas 65800-000, MA, Brazil
Jenilton Gomes da Cunha
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Nemilda Pereira Soares
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Estefenson Marques Morais
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Antônio Afonso Sousa do Nascimento
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Djavan Pinheiro Santos
Solo Agrícola—Consultoria e Projetos, Cristino Castro 64920-000, PI, Brazil
Murilo de Sousa Almeida
Departamento de Ciências Agrárias, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, BR 135, km 3—Planalto Horizonte, CEP, Bom Jesus 64900-000, PI, Brazil
Jorge González Aguilera
Department of Crop Science, State University of Mato Grosso do Sul, Cassilândia 79540-000, MS, Brazil
Luis Morales-Aranibar
National Intercultural University of Quillabamba, La Convenciòn, Cusco 08741, Peru
Eliseo Pumacallahui Salcedo
National Intercultural University of Quillabamba, La Convenciòn, Cusco 08741, Peru
Richar Marlon Mollinedo Chura
Departamento Académico de Ciencias Físico Matemáticas, Universidad Nacional del Altiplano-Puno, Puno 21001, Peru
Wilberth Caviedes Contreras
Departamento Académico de Ciencias Básicas, Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Madre de Dios 17001, Peru
Roger Ccama Alejo
Departamento Académico de Ciencias Físico Matemáticas, Universidad Nacional del Altiplano-Puno, Puno 21001, Peru
In guava plants, production pruning can be performed twice a year, and the return of growth is dependent on the physiological responses that are altered by the different cultivation environments and adopted management. From this perspective, this study aimed to characterize the photosynthetic dynamics of guava plants influenced by different pruning and fruit thinning intensities during two growing seasons in the region of Currais, Piauí, Brazil. The plants were distributed in a randomized block design with a factorial arrangement (3 × 3 × 2) consisting of three pruning intensities (short, medium, and long) and three fruit thinning intensities (0, 10, and 20%) during two growing seasons. The data were subjected to a cluster analysis and canonical discriminant analysis to discriminate treatment groups based on the variables. Through a cluster analysis for the evaluated treatments, it was possible to split the two pruning seasons into five different groups clustered for the first pruning season and the second pruning season. The highest assimilation values were observed in the first pruning season and especially in plants that received short pruning with 0% fruit thinning, medium pruning with 10% and 20% fruit thinning, and long pruning with 10% fruit thinning. Through the graphic representation of the canonical discriminant analysis, the first two variables explained 93.40% of the total variance contained in the nine original variables. The highest means of ambient PAR, transpiration, leaf temperature, internal carbon, and ambient temperature were observed in the second pruning season and in plants that received short pruning with 10% and 20% fruit thinning, medium pruning with 0% and 20% fruit thinning, and long pruning with 0%, 10%, and 20% fruit thinning favors a higher photosynthetic accumulation in guava plants. We observed a multiplicity of responses; however, short pruning with 10% thinning should be considered for both seasons.