Next Article in Journal
A Simple Light-Use-Efficiency Model to Estimate Wheat Yield in the Semi-Arid Areas
Next Article in Special Issue
The Comparison of Constant and Dynamic Red and Blue Light Irradiation Effects on Red and Green Leaf Lettuce
Previous Article in Journal
Preharvest Application of Oxalic Acid Improved Pomegranate Fruit Yield, Quality, and Bioactive Compounds at Harvest in a Concentration-Dependent Manner
Previous Article in Special Issue
Physiological and Nutraceutical Quality of Green and Red Pigmented Lettuce in Response to NaCl Concentration in Two Successive Harvests
Article

Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce

Department of Agricultural, Food and Forestry Sciences, University of Palermo, Viale delle Scienze 4, 90128 Palermo, Italy
*
Authors to whom correspondence should be addressed.
Agronomy 2020, 10(10), 1523; https://doi.org/10.3390/agronomy10101523
Received: 10 September 2020 / Revised: 30 September 2020 / Accepted: 2 October 2020 / Published: 6 October 2020
Mediterranean areas with intensive agriculture are characterized by high salinity of groundwater. The use of this water in hydroponic cultivations can lead to nutrient solutions with an electrical conductivity that overcomes the tolerance threshold of many vegetable species. Plant growth-promoting rhizobacteria (PGPR) were shown to minimize salt stress on several vegetable crops but the studies on the application of PGPR on leafy vegetables grown in hydroponics are rather limited and have not been used under salt stress conditions. This study aimed to evaluate the use of plant growth-promoting bacteria to increase the salt tolerance of leaf lettuce grown in autumn and spring in a floating system, by adding a bacterial biostimulant (1.5 g L−1 of TNC BactorrS13 a commercial biostimulant containing 1.3 × 108 CFU g−1 of Bacillus spp.) to mineral nutrient solutions (MNS) with two salinity levels (0 and 20 mM NaCl). Leaf lettuce plants showed a significant reduction of growth and yield under salt stress, determined by the reduction of biomass, leaf number, and leaf area. Plants showed to be more tolerant to salinity in autumn than in spring. The inhibition of lettuce plant growth due to salt stress was significantly alleviated by the addition of the bacterial biostimulant to the MNS, which had a positive effect on plant growth and fresh and dry biomass accumulation of the unstressed lettuce in both cultivation seasons, and maintained this positive effect in brackish MNS, with similar or even significantly higher values of morphologic, physiologic, and yield parameters than those recorded in control unstressed plants. View Full-Text
Keywords: saline water; leafy vegetables; Lactuca sativa L. var. Crispa; floating system; nutrient solution; bacterial biostimulant; PGPR; Bacillus saline water; leafy vegetables; Lactuca sativa L. var. Crispa; floating system; nutrient solution; bacterial biostimulant; PGPR; Bacillus
Show Figures

Figure 1

MDPI and ACS Style

Moncada, A.; Vetrano, F.; Miceli, A. Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce. Agronomy 2020, 10, 1523. https://doi.org/10.3390/agronomy10101523

AMA Style

Moncada A, Vetrano F, Miceli A. Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce. Agronomy. 2020; 10(10):1523. https://doi.org/10.3390/agronomy10101523

Chicago/Turabian Style

Moncada, Alessandra, Filippo Vetrano, and Alessandro Miceli. 2020. "Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce" Agronomy 10, no. 10: 1523. https://doi.org/10.3390/agronomy10101523

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop