SILVA, A. A. R.; SILVA, ANDRÉ ALISON RODRIGUES DA.; SILVA, ANDRÉ A. R. DA.; http://lattes.cnpq.br/3573313539974806; SILVA, André Alisson Rodrigues da.
Resumen:
The use of saline water in soursop cultivation in the semi-arid region of Northeast Brazil
can be made possible through the use of substances that can attenuate the deleterious
effects of saline stress, such as salicylic acid. In this context, the objective of the present
study was to evaluate the effect of foliar application of salicylic acid concentrations on
the growth and physiology of soursop irrigated with saline water. The study was carried
out in a greenhouse using drainage lysimeters; a randomized block design and a 5 × 4
factorial arrangement were used, with five levels of electrical conductivity of the
irrigation water - ECw (0.8-control; 1.6; 2.4; 3.2 and 4.0 dS m-1) and four concentrations
of salicylic acid - AS (0 -control; 1.2; 2.4 and 3.6 mM), with three replications and one
plant per plot. The growth variables and photosynthetic pigments were positively
influenced by the interaction of the electrical conductivity of irrigation water and salicylic
acid concentrations between 1.0 and 2.0 mM. The foliar application of salicylic acid
between concentrations of 1.4 and 1.6 mM attenuated the effects of saline stress on the
gas exchange of soursop. Foliar application of salicylic acid at a concentration of 1.4 mM
increased the levels of photosynthetic pigments in soursop when irrigated with electrical
conductivities of up to 1.5 dS m-1. There was no significant interaction of the factors under
study on the fluorescence of chlorophyll a in soursop, however, irrigation with water of
electrical conductivity up to 1.8 dS m-1 did not compromise the quantum efficiency of
photosystem II. The percentage of electrolyte leakage was reduced with foliar application
of salicylic acid to a concentration of 1.3 mM. Foliar application of salicylic acid in
concentrations greater than 2.0 mM is not recommended, as it intensifies the deleterious
effects of irrigation water salinity on growth, gas exchange, photosynthetic pigments and
the percentage of water extravasation. electrolytes.