Foliar application of H2O2 as salt stress attenuator in ‘BRS Rubi do Cerrado’ sour passion fruit

Abstract

Irrigation with saline water causes a reduction in yield, especially in semi-arid regions. Cultivation strategies have been developed to mitigate salt stress on plants, such as the use of hydrogen peroxide. The objective of this study was to evaluate the attenuating effect of hydrogen peroxide on the gas exchange and growth of ‘BRS Rubi do Cerrado’ sour passion fruit cultivated under irrigation with saline water. The design was completely randomized in split-plot plots, with water salinity levels ECw (0.6, 1.2, 1.8, 2.4, and 3.0 dS m-1) considered the plots and the concentrations of hydrogen peroxide H2O2 (0, 15, 30, and 45 μM) considered the subplots, with three replicates. Gas exchange (stomatal conductance, transpiration, CO2 assimilation rate, intercellular CO2 concentration, instantaneous water use efficiency, and instantaneous carboxylation efficiency), and absolute and relative growth rates in stem diameter were evaluated. An increase in irrigation water salinity from 0.6 dS m-1 reduced gas exchange, and exogenous application of hydrogen peroxide did not promote a significant effect on gas exchange. However, foliar application of hydrogen peroxide at 15 μM increased the growth of ‘BRS Rubi do Cerrado’ sour passion fruit.

Hydrogen peroxide as a saline stress attenuator in okra (Abelmoschus esculentus L.)

“…The experimental design used was randomized blocks, in a 5 × 3 factorial arrangement, referring to five levels of electrical conductivity of water -ECw (0.3; 1.3; 2.3; 3.3 and 4.3 dS m -1 ) and three concentrations of hydrogen peroxide -H 2 O 2 (0, 25 and 50 μM) with five replicates and one plant per plot. Due to few studies with H 2 O 2 in vegetables, the concentrations used were based on studies carried out with zucchini (DANTAS et al, 2021), passion fruit (RAMOS et al 2021) and passion fruit (Silva et al, 2019), while salinity levels were based on SOARES et al (2020).…”

Sugar Metabolism and Photosynthesis of Tomatoes Irrigated with Water Treated with Low-Frequency Electromagnetic Resonance Fields in Different Fertigation Doses

“…Ramos et al [60] and Saddiq et al [61] studied the fluorescence of chlorophyll a in wheat leaves to verify the effects of salinity on PSII. They found that the rapid decline in photosynthesis under saline stress is reversible and specific for osmotic stress, where the slow decline is irreversible and specific to ionic stress.…”