Photosynthetic responses of <i>Eucalyptus seedlings</i> submitted to chemical and mechanical stimulus

Auteurs-es

DOI :

https://doi.org/10.5902/1980509830685

Mots-clés :

Jasmonic acid, Stem bending, Quality of seedlings, Clone 1528

Résumé

This work aimed to investigate the photosynthetic responses of Eucalyptus urophylla x Eucalyptus grandis hybrids 1528 submitted to the application of jasmonic acid (JA) and stem bending. The experiment was conducted in a shade house using a completely randomized design with five replicates of 20 seedlings, with the following treatments: T1: control, T2: 8.0 μmol of JA and T3: 40 stem bending. The net assimilation rate of CO2 (A), stomatal conductance (gs), internal CO2 concentration (Ci), leaf transpiration rate (E), water use efficiency (WUE), intrinsic efficiency of use of Water (iWUE) and carboxylation efficiency (Fc) were measured with an IRGA. The dose of JA applied to the seedlings was insufficient to alter the photosynthetic responses in relation to the control treatment. Mechanical stimuli induced by stem bending in eucalyptus hybrid 1528 seedlings promoted an increase in the maximum photosynthetic capacity and maximum assimilation of CO2, but the seedlings presented a reduction in the efficiency of the water use, that is, lower photosynthetic efficiency when compared to the seedlings submitted to other treatments. Seedlings of eucalyptus hybrid 1528 submitted to mechanical stimuli and jasmonic acid show greater respiration under low flow levels of photosynthetically active photons.

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Bibliographies de l'auteur-e

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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Publié-e

2019-06-30

Comment citer

Lima, P. R., Malavasi, U. C., Battistus, A. G., Dranski, J. A. L., & Malavasi, M. de M. (2019). Photosynthetic responses of <i>Eucalyptus seedlings</i> submitted to chemical and mechanical stimulus. Ciência Florestal, 29(2), 740–753. https://doi.org/10.5902/1980509830685

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Vol. 29 No. 2 (2019)

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