ORIGINAL RESEARCH
Influence of Exopolysaccharide-Producing
Bacteria and SiO2 Nanoparticles on Proline
Content and Antioxidant Enzyme Activities
of Tomato Seedlings (Solanum lycopersicum L.)
under Salinity Stress
| 1 | Department of Soil Sciences, Isfahan (Khorasgan) branch, Islamic Azad University, Isfahan, Iran |
| 2 | Department of Basic Medical Sciences, Isfahan (Khorasgan) branch, Islamic Azad University, Isfahan, Iran |
| 3 | Waste and Wastewater Research Center, Islamic Azad University, Isfahan (Khorasgan) Branch Isfahan, Iran |
CORRESPONDING AUTHOR
Arezoo Tahmourespour
Department of Basic Medical Sciences, Isfahan (Khorasgan) branch, Islamic Azad University, Isfahan, Iran.
Department of Basic Medical Sciences, Isfahan (Khorasgan) branch, Islamic Azad University, Isfahan, Iran.
Submission date: 2017-10-14
Final revision date: 2017-12-03
Acceptance date: 2017-12-14
Online publication date: 2018-08-01
Publication date: 2018-11-20
Pol. J. Environ. Stud. 2019;28(1):153–163
KEYWORDS
TOPICS
ABSTRACT
A greenhouse experiment was conducted to evaluate the effects regarding inoculation of
exopolysaccharide (EPS)-producing bacterium, the extracted EPS and silicon nanoparticles on
Solanum lycopersicum L. seeds under salinity stress, in a completely randomized factorial design with
three replicates. The inoculated seeds with silicon nanoparticles (8 gr L-1), bacterial EPS (0.01 M), and
1 mL of bacterial suspension (1×108 CFU mL-1) were sown in pots and irrigated with water at different
salinity levels (0.3, 2, 4, 6, and 8 dS m-1). Results showed that treatment application could enhance salinity
tolerance of tomato seeds and improve plant growth so that combined treatments of EPS and silicon
nanoparticles (S.E.N), bacteria and silicon nanoparticles (S.B.N), and EPS with silicon nanoparticles
and bacteria (S.E.B.N) were the best treatments for plant growth and improvement regarding salinity
levels. The mentioned treatments significantly (p<0.01) increased root and shoot fresh or dry weight in
comparison to the control sample. In addition, treatments significantly (p<0.01) decreased proline content
and antioxidant enzyme activities. Thus, it can be concluded that applied treatments are suitable for
agricultural and environmental applications and bring about less damage caused by salinity stress.
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