Hydrogen peroxide in the acclimation of yellow passion fruit seedlings to salt stress

André A R Da Silva,Luana L De S A Veloso,Hans R Gheyi,Carlos A V De Azevedo,Geovani S De Lima,Pedro D Fernandes

doi:10.1590/1807-1929/agriambi.v25n2p116-123

Abstract

ABSTRACT The objective of the present study was to evaluate the effect of exogenous application of hydrogen peroxide on the emergence, growth and gas exchange of yellow passion fruit seedlings subjected to salt stress. The experiment was conducted in pots (Citropote®) under greenhouse conditions, in the municipality of Campina Grande, PB, Brazil. Treatments were distributed in a randomized block design, in a 4 x 4 factorial arrangement, with four levels of electrical conductivity of irrigation water (0.7, 1.4, 2.1 and 2.8 dS m-1) associated with four concentrations of hydrogen peroxide (0, 25, 50 and 75 μM), with four replicates and two plants per plot. Irrigation using water with electrical conductivity above 0.7 dS m-1 negatively affects the emergence and growth of passion fruit. Hydrogen peroxide concentrations between 10 and 30 μM induce the acclimation of passion fruit plants to salt stress, mitigating the deleterious effects of salinity on the relative growth rate in stem diameter and leaf area, stomatal conductance, transpiration, CO2 assimilation rate and instantaneous carboxylation efficiency. Irrigation water salinity combined with hydrogen peroxide concentrations above 30 μM causes reduction in passion fruit growth and physiology.

Highlights

Yellow passion fruit (Passiflora edulis Sims f. flavicarpa Degener) is among the most economically important fruit crops in Brazil, accounting for about 95% of commercial orchards, with 60% of all production located in the North and Northeast regions
In view of the above, the objective of this study was to evaluate the effect of exogenous application of hydrogen peroxide on the emergence, growth and gas exchange of passion fruit seedlings cultivated under different levels of irrigation water salinity
According to the summary of the analysis of variance (Table 1), there was a significant effect of the interaction between the studied factors (SL x H2O2) on the relative growth rate in stem diameter (RGRSD) and leaf area (RGRLA)

Summary

Introduction

Yellow passion fruit (Passiflora edulis Sims f. flavicarpa Degener) is among the most economically important fruit crops in Brazil, accounting for about 95% of commercial orchards, with 60% of all production located in the North and Northeast regions. Flavicarpa Degener) is among the most economically important fruit crops in Brazil, accounting for about 95% of commercial orchards, with 60% of all production located in the North and Northeast regions. It is possible to consider that the viable production of passion fruit seedlings in the semi-arid region of Northeastern Brazil can be optimized through alternatives that mitigate the negative effect of salt stress on plants. In this scenario, studies conducted using hydrogen peroxide in the acclimation of plants to salt stress are alternatives to increase their capacity to survive adverse conditions (Silva et al, 2019b)

Objectives

Methods

Results