DANTAS, M. V.; DANTAS, MAILA V.; http://lattes.cnpq.br/1264469851207038; DANTAS, Maíla Vieira.
Résumé:
The use of brackish water in the semiarid region is an alternative to produce in the
period of water scarcity. Therefore, it is essential to apply saline stress attenuators to
minimize the deleterious effects of salts on crop growth and production. In this context,
the present work aimed to evaluate the attenuating effect of hydrogen peroxide on saline
stress in zucchini plants grown in a hydroponic system. The work was carried out in a
greenhouse, in Pombal - PB, using a completely randomized design, in a 4 × 4 factorial
scheme, with four levels of electrical conductivity of the nutrient solution - ECsn (2.1 -
control; 3.6 ; 5.1 and 6.6 dS m-1), and four concentrations of hydrogen peroxide – H2O2
(0; 20; 40 and 60 μM), with three replications. Using the hydroponic cultivation system
type Laminar Nutrient Flow Technique. The nutrient solution with electrical
conductivity of 2.1 dS m-1 and hydrogen peroxide spraying at concentrations of 40 and
60 μM promoted an increase in stem diameter and root length. However, the salinity of
the nutrient solution above 2.1 dS m-1 reduced the levels of photosynthetic pigments,
gas exchange, growth and dry phytomass accumulation. The concentration of 20 μM
H2O2 and 2.1 dS m-1 nutrient solution increased the total fruit weight and basal diameter
of zucchini fruits. The increase of ECsn and the concentration of H2O2 alone reduced
the pH and the number of fruits.