Respostas fotossintéticas em mudas de eucalipto submetidas a estímulo químico e mecânico

Autores

DOI:

https://doi.org/10.5902/1980509830685

Palavras-chave:

Ácido jasmônico, Flexões caulinares, Qualidade de mudas, Clone 1528

Resumo

Este trabalho objetivou investigar as respostas fotossintéticas em mudas de híbrido 1528 de Eucalyptus urophylla x Eucalyptus grandis submetidas à aplicação de ácido jasmônico (JA) e flexões caulinares. O experimento foi conduzido em casa de sombra utilizando delineamento inteiramente ao acaso com cinco repetições de 20 mudas, com os seguintes tratamentos: T1: controle, T2: 8,0 μmol de JA e T3: 40 flexões caulinares. A taxa de assimilação líquida de CO2 (A), condutância estomática (gs), concentração interna de CO 2 (Ci), taxa de transpiração da folha (E), efciência do uso de água (WUE), efciência intrínseca do uso
de água (iWUE) e efciência de carboxilação (Fc) foram mensuradas com o auxílio do IRGA. A dose de JA aplicada nas mudas foi insufciente para alterar as respostas fotossintéticas em relação ao tratamentocontrole. Estímulos mecânicos induzidos através de flexões caulinares em mudas do híbrido 1528 de eucalipto promoveram incremento da capacidade fotossintética máxima e máxima assimilação de CO2. Porém, as mudas apresentaram redução na efciência do uso da água, ou seja, menor efciência fotossintética quando comparado com as mudas submetidas aos demais tratamentos. Mudas do híbrido 1528 de eucalipto submetidas aos estímulos mecânico e ácido jasmônico apresentaram maior respiração sob níveis baixos de fluxo de fótons fotossinteticamente ativos.

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Biografia do Autor

Paulo Ricardo Lima, State University of Mato Grosso do Sul, Mundo Novo, MS

Agricultural Engineer from the Integrated School of Campo Mourão - PR (2009); Postgraduate in Environmental Management by UNIGRAN (2011); Master in Agronomy in the area of Plant Production by the State University of Western Paraná - UNIOESTE (2014). PhD in Agronomy in the area of Plant Production by the State University of Western Paraná - UNIOESTE (2017). He is currently professor of the discipline of Forestry of the course of Agronomy in the University Center Assis Gurgacz (FAG); Assistant Professor in the Environmental Management course at the State University of Mato Grosso do Sul (UEMS), working in the area of Forestry, Plant Production, Recovery of degraded areas, Soils, Economics and Environmental Management.

Ubirajara Contro Malavasi, State University of Western Paraná, Marechal Cândido Rondon, PR

He holds a degree in Forest Engineering from the Federal Rural University of Rio de Janeiro (1973), a Master's degree in Forest Science - Oregon State University (1977), and a PhD from Forest Science - Oregon State University (1983). He is currently an associate professor at the State University of Western Paraná. He has collaborated in the review of manuscripts of the periodicals Revista Árvore, Floresta e Ambiente, Journal of Tropical Forest Science, and Forest Science. Collaborates with the publication of the journal SCIENTIA AGRARIA PARANAENSIS. He acts as a reviewer of the journal ARVORE, SCIENCE FOREST, CERNE, ACTA AMAZONICA, BRAZILIAN FOREST RESEARCH, RURAL SCIENCE, NEW FOREST. He has experience in the area of FORESTRY with emphasis on Forestry and Reforestation in areas of ciliary domain, working mainly on the following themes: forest seedlings, plant production, forest nurseries, ecophysiology of tree species, and in the field of ECOLOGY FORESTRY working on the themes of establishing forest stands, recovery of altered / devegetada areas, and invasive plant species.

Andre Gustavo Battistus, State University of Western Paraná, Foz do Iguaçu, PR

Development Coordinator - Plant Nutrition Tecnomyl SA Acted as Coordinator and Professor of the Agronomy Course of Medianeira / PR - UDC Medianeira School between 2016 and 2018. Graduated in Agronomy from the State University of the West of Paraná - UNIOESTE, obtaining the title of Agronomic Engineer between 2008 and 2012. Master's degree in Agronomy by the Postgraduate Program in Agronomy - PPGA of the State University of the West of Paraná - UNIOESTE, between the years of 2013 and 2015, focusing on Plant Physiology. PhD in Agronomy by the Postgraduate Program in Agronomy - PPGA of the State University of the West of Paraná - UNIOESTE, between the years of 2015 and 2019, focusing on Plant Physiology. Active member of the research group of Physiology of Cultivated Plants in the Western Region of Paraná. Member of the Collegiate of the Postgraduate Program in Agronomy - PPGA (Master degree level representative, management 2014). Member of the Collegiate of the Postgraduate Program in Agronomy - PPGA (PhD level representative, management 2015). Member of the Commission for the purpose of reevaluation of the PPGA Regulation (PhD Representative) From 2011 to 2012 he participated as a participant in the research group on Biological Control and Alternative in Plant Protection - COBALFI.

João Alexandre Lopes Dranski, Faculdade Educacional de Medianeira, Medianeira, PR

He holds a degree in Biological Sciences with emphasis in Biotechnology - Universidade Paranaense (UNIPAR). Postgraduate Lato Sensu in Environmental Management with qualification to the Higher Magisterium - Faculdade Fr. Bagozzi. Master's and PhD in Agronomy - State University of Western Paraná (UNIOESTE). He is a lecturer in the undergraduate course in Agronomy at UDC Medianeira. He works in the areas of plant physiology, technology and physiology of forest seeds and cultivated species, forestry, biostatistics and experimental statistics.

Marlene de Matos Malavasi, Western State University of Paraná, Marechal Cândido Rondon, PR

He holds a bachelor's degree in Agricultural Engineering from the Federal University of Lavras (1972), a master's degree in Crop Science - Oregon State University (1977) and a doctorate from Forest Science - Oregon State University (1983). He is currently an Associate Professor at the State University of Western Paraná. He has experience in the area of Agronomy, with emphasis in Plant Science, working mainly on the following subjects: seeds, nursery, germination, forest seedlings and rapid tests of vigor.

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Publicado

30-06-2019

Como Citar

Lima, P. R., Malavasi, U. C., Battistus, A. G., Dranski, J. A. L., & Malavasi, M. de M. (2019). Respostas fotossintéticas em mudas de eucalipto submetidas a estímulo químico e mecânico. Ciência Florestal, 29(2), 740–753. https://doi.org/10.5902/1980509830685

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v. 29 n. 2 (2019)

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