Abstract
The tomato is one of the most important vegetables in Brazilian market. The production of this vegetable can be limited by the excess of salts in the water used for irrigation. The use of phytohormones, such as salicylic acid (SA), is used to minimize the negative effects of excess salts on plants. The objective of this paper was to evaluate the attenuating effect of salicylic acid on tomato plants growth irrigated with saline water. The experimental design was the randomized blocks in an incomplete factorial scheme 5 (SA doses: 0.0, 0.29, 1.0, 1.71 and 2.0 mM) x 5 (electrical conductivities of irrigation water - ECw: 0.5, 1.3, 3.25, 5.2 and 6 dS m-1), combined according to the experimental matrix Central Compound of Box, with four replicates and two plants per experimental plot. Growth evaluations were performed 45 days after the beginning of irrigation with saline water. Plant height, number of leaves, stem diameter, absolute and relative growth rate for plant height, root dry mass, shoot dry mass, total dry mass, Dickson's quality index, leaf area, specific leaf area and specific leaf weight were evaluated. The tomato plants growth was reduced by the increase in ECw. Salicylic acid, applied exogenously up to 2.0 mM, did not promote attenuating effect of salinity on tomato plants.
Highlights
Tomato (Solanum lycopersicon L. - Solanaceae) is one of the main vegetables produced and consumed around the world, being a source of vitamins and minerals (Akbar et al, 2018)
In view of the need for techniques that reduce the damage caused by salt stress in cultivated plants, the objective of this paper was to evaluate the attenuating effect of salicylic acid on the tomato (Solanum lycopersicon) plants growth irrigated with saline water
The stem diameter decreased with the increase in electrical conductivities of irrigation water (ECw), with decreases of 13.5% when subjected to the highest salinity when compared to the lowest ECw (Figure 1B)
Summary
Tomato (Solanum lycopersicon L. - Solanaceae) is one of the main vegetables produced and consumed around the world, being a source of vitamins and minerals (Akbar et al, 2018). - Solanaceae) is one of the main vegetables produced and consumed around the world, being a source of vitamins and minerals (Akbar et al, 2018) The productivity of this vegetable can be influenced by rainfall, cultivar used, temperature, fertilization, in addition to the quality of the water used for irrigation (Rodriguez-Ortega et al, 2019). The exogenous application of salicylic acid (SA) is an alternative to minimize the deleterious effects of salt stress on plants (Silva et al, 2018; Riaz et al, 2019) This phytohormone regulates plant growth, acting on several physiological processes, as responses to the damage caused by abiotic stresses (Farhangi-Abriz & Ghassemi-Golezani, 2018; Kaya et al., 2020). The beneficial effect of SA on plants under saline stress conditions was found in tomato plants (Gharbi et al, 2018), peppers (Kaya et al, 2020) and melons (Nóbrega et al, 2018)
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