Photochemical efficiency in pineapple plants under saline water irrigation

Brito, Cleiton Fernando Barbosa; Fonseca, Varley Andrade; Santos, Marcelo Rocha dos; Donato, Sérgio Luiz Rodrigues; Arantes, Alessandro de Magalhães; Santos, Aloísio José dos

doi:10.4136/ambi-agua.2564

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ARTICLES • Rev. Ambient. Água 15 (5) • 2020 • https://doi.org/10.4136/ambi-agua.2564 copy

Photochemical efficiency in pineapple plants under saline water irrigation

Eficiência fotoquímica em plantas de abacaxi sob irrigação com água

Authorship SCIMAGO INSTITUTIONS RANKINGS

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 ET_c using water with electrical conductivity (EC_w) of 0.75 dS m^-1; and 50, 75, 100 and 125% of ET_c using water with EC_w 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 (q_P), non-photochemical quenching (NPQ) and chlorophyll fluorescence decrease ratio (R_Fd) 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.

Keywords:
Ananas comosus; CAM plants; chlorophyll fluorescence; salinity

Instituto de Pesquisas Ambientais em Bacias Hidrográficas Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi), Estrada Mun. Dr. José Luis Cembranelli, 5000, Taubaté, SP, Brasil, CEP 12081-010 - Taubaté - SP - Brazil
E-mail: ambi.agua@gmail.com

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[1] ^*Corresponding author: Cleiton Fernando Barbosa Brito, e-mail: cleiton.ibce@hotmail.com

Month	Depths
	100% ET_c	50% ET_c	75% ET_c	100% ET_c	125% ET_c
	0.75 dS m^-1	3.6 dS m^-1
Aug/15	0.57 A	0.62 A	0.56 A	0.52 B	0.56 A
Sep/15	0.57 A	0.49 B	0.55 A	0.49 B	0.53 A
Oct/15	0.57 A	0.52 B	0.54 A	0.49 B	0.51 A
Nov/15	0.65 Aa	0.54 Bb	0.58Aab	0.55Ab	0.54Ab
Dec/15	0.57 Aa	0.46 Bb	0.45 Bb	0.5 Bab	0.49Aab
Feb/16	0.6 A	0.59 A	0.57 A	0.57 A	0.6 A
Mar/16	0.56 A	0.59 A	0.61 A	0.57 A	0.53 A
Apr/16	0.53 B	0.58 A	0.59 A	0.58 A	0.54 A
May/16	0.52 B	0.57 A	0.58 A	0.58 A	0.5 A
Jun/16	0.55 A	0.56 A	0.56 A	0.57 A	0.5 A
Jul/16	0.48 B	0.51 B	0.52 B	0.5 B	0.52 A
Aug/16	0.49 B	0.51 B	0.5 B	0.5 B	0.5 A
Sep/16	0.46 B	0.49 B	0.5 B	0.5 B	0.49 A
CV (%)	40.27

Depths	Fs	Fms	Fvs
100% ET_c (EC_w =0.75 dSm^-1)	403.9 a	688.8 a	284.8 a
50% ET_c (EC_w =3.6 dS m^-1)	354.6 b	547.9 b	193.2 b
75% ET_c (EC_w =3.6 dS m^-1)	380.1 ab	589.5 b	209.4 b
100% ET_c (EC_w =3.6 dS m^-1)	363.6 b	572.1 b	208.5 b
125% ET_c (EC_w =3.6 dS m^-1)	374.0 ab	595.2 b	221.3 b
CV (%)	29.78	48.94	91.74

Depths	Yield		q_P		NPQ		R_Fd
Depths	8 a.m.	2 p.m.	8 a.m.	2 a.m.	8 a.m.	2 p.m.	8 a.m.	2 p.m.
100% ET_c (EC_w=0.75dS m^-1)	0.26 Ab	0.30 Aa	0.44 Aa	0.33 Ab	0.30 Aa	0.36 Aa	1.48 Ab	2.28 Aa
50% ET_c (EC_w=3.6 dS m^-1)	0.24 Ab	0.30 Aa	0.44 Aa	0.34 Ab	0.31 Aa	0.35 Aa	1.50 Ab	2.24 Aa
75% ET_c (EC_w=3.6 dS m^-1)	0.24 Ab	0.34 Aa	0.45 Aa	0.34 Ab	0.30 Aa	0.31 Aa	1.39 Ab	2.12 Aa
100% ET_c (EC_w=3.6 dS m^-1)	0.26 Ab	0.31 Aa	0.45 Aa	0.38 Ab	0.27 Aa	0.30 Aa	1.38 Ab	1.92 Aa
125% ET_c (EC_w=3.6 dS m^-1)	0.27 Aa	0.30 Aa	0.43 Aa	0.37 Ab	0.29 Aa	0.31 Aa	1.43 Ab	1.95 Aa
CV (%)	38.40		28.56		51.54		53.51