ARAGÃO, J.; ARAGÃO, JÉSSICA.; JÉSSICA ARAGÃO.; http://lattes.cnpq.br/2089969849383891; ARAGÃO, Jéssica.
Resumo:
The cultivation of bell pepper in the semi-arid region of the Brazilian Northeast using saline
waters can be made possible through the use of substances that attenuate the deleterious effects
of saline stress. In this context, the objective of this study was to evaluate the effects of
hydrogen peroxide on the growth, physiology and production of 'All Big' bell pepper under
irrigation with saline water. The experiment was treated under greenhouse conditions, in
Campina Grande-PB. The treatments were distributed in a randomized block design, in a 5 ×
5 factorial scheme, corresponding to five levels of electrical conductivity of irrigation water -
ECw (0.8; 1.2; 2.0; 2.6 and 3.2 dS m-1) and five concentrations of hydrogen peroxide – H2O2
(0, 15, 30, 45 and 60 μM), with three replicates and one plant per plot. The application of
hydrogen peroxide at a concentration of 15 μM attenuated the effects of salt stress on the
growth, physiology and production of 'All Big' pepper irrigated with water with an electrical
conductivity of up to 1.4 dS m-1. Irrigation with 3.2 dS m-1 water was detrimental to initial
fluorescence, initial fluorescence before the saturation pulse, and water use efficiency in 'All
Big' pepper. The 'All Big' bell pepper was classified as moderately sensitive to saline stress,
with a water threshold salinity level of 1.43 dS m-1, with a unit decrease of 8.25% above this
saline level.
