Photochemical efficiency in pineapple plants under saline water irrigation

  • Cleiton Fernando Barbosa Brito Departamento de Ciências Agrárias. Universidade Estadual de Montes Claros (UNIMONTES), Caixa Postal 91, CEP: 39440-000, Janaúba, MG, Brazil.
  • Varley Andrade Fonseca Departamento de Ciências Agrárias. Universidade Estadual de Montes Claros (UNIMONTES), Caixa Postal 91, CEP: 39440-000, Janaúba, MG, Brazil.
  • Marcelo Rocha dos Santos Setor de Agricultura. Instituto Federal de Educação, Ciência e Tecnologia Baiano (IFBaiano), Caixa Postal 09, CEP: 46430-000, Guanambi, BA, Brazil.
  • Sérgio Luiz Rodrigues Donato Setor de Agricultura. Instituto Federal de Educação, Ciência e Tecnologia Baiano (IFBaiano), Caixa Postal 09, CEP: 46430-000, Guanambi, BA, Brazil.
  • Alessandro de Magalhães Arantes Setor de Agricultura. Instituto Federal de Educação, Ciência e Tecnologia Baiano (IFBaiano), Caixa Postal 09, CEP: 46430-000, Guanambi, BA, Brazil.
  • Aloísio José dos Santos Setor de Agricultura. Instituto Federal de Educação, Ciência e Tecnologia Baiano (IFBaiano), Caixa Postal 09, CEP: 46430-000, Guanambi, BA, Brazil.
DOI: https://doi.org/10.4136/ambi-agua.2564
Keywords: Ananas comosus, CAM plants, chlorophyll fluorescence, salinity.

Abstract

Studies determining physiological characteristics of field-grown pineapples irrigated with low-quality water are lacking. This work evaluated the photochemical efficiency of ‘Pérola’ pineapple irrigated with saline water in the semiarid region of Bahia, Brazil. The experiment was carried out in randomized blocks with five treatments consisting of the following irrigation depths: 100% of ETc using water with electrical conductivity (ECw) of 0.75 dS m-1; and 50, 75, 100 and 125% of ETc using water with ECw of 3.6 dS m-1. Chlorophyll a fluorescence measurements were made over the course of 13 months using a pulse-modulated fluorometer, in all treatments. Quantum efficiency (Fv/Fm) fluctuated throughout the cycle of the pineapple with values below the ideal, especially at the end of the crop cycle. Quantum yield of photosystem II (Yield), photochemical quenching (qP), non-photochemical quenching (NPQ) and chlorophyll fluorescence decrease ratio (RFd) were not influenced by irrigation depths. Therefore, energy used for photosynthetic processes in pineapple plants is not affected by irrigation using saline water with electrical conductivity of 3.6 dS m-1.


Published
03/09/2020
Issue
Vol. 15 No. 5 (2020)
Section
Papers

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