Abstract
ABSTRACT The objective of this work was to evaluate the biomass production and antioxidant enzymatic system activity of irrigated forage sorghum with saline aquaculture effluent under different leaching fractions. The experiment was conducted in the Caatinga Experimental Field of the Embrapa Semiarido, in Petrolina, State of Pernambuco, Brazil. The experimental design was a complete randomized block in a split-plot arrangement with four replications, consisting of three forage sorghum varieties (Volumax, F305 and Sudan) and four leaching fractions (0, 5, 10 and 15%). The vegetal materials were collected when the plants were at the soft-dough stage. The biomass production and activity of the enzymes superoxide dismutase, catalase and ascorbate peroxidase were evaluated. Irrigation with saline aquaculture effluent with leaching fraction of 15% results in low salinity level in the root zone and higher biomass production of forage sorghum Sudan and F305, in semiarid conditions. The antioxidant system was activated in the three sorghum varieties to prevent accumulation of reactive oxygen species, with the synchrony between the enzymes superoxide dismutase and catalase resulting in a better productive response of the varieties Sudan and F305.
Highlights
Saline water is often the only water found in arid and semiarid regions
The greater the amount of salts in the water, the more severe is this abiotic stress and damage to plants, techniques to minimize this stress through irrigation is very important
More tolerant species and cultivars to the adverse conditions of semiarid regions have been used to increase the productive potential of these regions
Summary
Saline water is often the only water found in arid and semiarid regions. The greater the amount of salts in the water, the more severe is this abiotic stress and damage to plants, techniques to minimize this stress through irrigation is very important. More tolerant species and cultivars to the adverse conditions of semiarid regions have been used to increase the productive potential of these regions In this context, forage sorghum production has increasing in recent years in the Brazilian semiarid region, since it is a typical hot climate plant, with xerophilous characteristics, low soil fertility requirement and tolerance to abiotic stresses, such as water deficit and salinity (GUIMARÃES et al, 2016; HEFNY; ABDEL-KADER, 2009). Semiarid regions usually have high temperatures, water deficit and high salt rates in soil and water. These factors can cause mild to severe changes in plant metabolism, depending on the intensity and interaction between them (NILSEN; ORCUTT, 1996)
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