Acta Physiologiae Plantarum

, 41:163 | Cite as

Photosynthetic apparatus protection and drought effect mitigation in açaí palm seedlings by rhizobacteria

  • Gledson Luiz Salgado de Castro
  • Dalton Dias da Silva Júnior
  • Rafael Gomes Viana
  • Marcela Cristiane Ferreira Rêgo
  • Gisele Barata da SilvaEmail author
Original Article


Water deficit sensitivity decreases the açaí palm seedling production in nurseries. The goal of this study was to evaluate gas exchange, chlorophyll a fluorescence, lipid peroxidation and antioxidant enzymes in açaí palm seedlings inoculated with rhizobacteria. Four rhizobacteria isolates (UFRA-58, UFRA-92, BRM-32111 and BRM-32113) and one control (without inoculation) were inoculated on açaí palm seedlings at field capacity (FC) 100%, 75%, 50% and 25%. Water deficit reduced photosynthetic performance in all açaí palm seedlings, but to a lesser extent in seedlings inoculated with rhizobacteria. At 75% FC, all inoculated seedlings maintained greater water potential, gas exchange and chlorophyll a fluorescence and, at 50% FC, only the seedlings inoculated with BRM-32111 and BRM-32113 were able to maintain these advantages in relation to the control. In 25% FC, no effect was observed for rhizobacteria inoculation. At 50% FC, the increase in catalase (CAT) enzymatic activity was induced by UFRA-58. The ascorbate peroxidase (APX) enzymatic activity was greater for UFRA-92, whereas superoxide dismutase (SOD) enzymatic activity was higher only for BRM-32113. The malonic aldehyde (MDA) content was greater only for control. Rhizobacterial inoculation in açaí palm seedlings attenuates the water deficit effects by photosynthetic performance maintenance and antioxidant enzymes activation, contributing to decrease the seedling mortality rate in nurseries.


Antioxidant enzymes Biostimulant Euterpe oleracea Photosynthesis 



Water use efficiency


Net CO2 assimilation rate


Ascorbate peroxidase EC


Pseudomonas fluorescens


Burkholderia pyrrocinia


Catalase EC


Field capacity


Intercellular CO2 concentration




Electron transport rate


Initial fluorescence


Maximum fluorescence


Effective photochemical efficiency


Photosystem II potential activity


Stomatal conductance


Malonic aldehyde


Photosynthetic active radiation


Plant growth-promoting rhizobacteria


Water potential


Photochemical dissipation coefficient


Non-photochemical dissipation coefficient


Burkholderia sp.


Bacillus subtilis


Superoxide dismutase EC


Thiobarbituric acid



The authors thank the Coordination for Higher Education Staff Development (CAPES) for granting fellowships and to the Plant Protection Laboratory (LPP) of the Federal Rural University of Amazon its logistical support.


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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2019

Authors and Affiliations

  • Gledson Luiz Salgado de Castro
    • 1
  • Dalton Dias da Silva Júnior
    • 2
  • Rafael Gomes Viana
    • 3
  • Marcela Cristiane Ferreira Rêgo
    • 1
  • Gisele Barata da Silva
    • 1
    Email author
  1. 1.Plant Protection Laboratory (LPP)Federal Rural University of Amazonia (UFRA), Institute of Agricultural SciencesBelémBrazil
  2. 2.Federal University of Amazonas (UFAM), Education, Agriculture and Environment InstituteHumaitáBrazil
  3. 3.Federal Rural University of Amazonia (UFRA), Institute of Agricultural SciencesBelémBrazil

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