Biostimulants-Based Amino Acids Augment Physio-Biochemical Responses and Promote Salinity Tolerance of Lettuce Plants (Lactuca sativa L.)
Abdelkader M. Voronina L. Baratova L. Shelepova O. Zargar M. Puchkov M. Loktionova E. Amantayev B. Kipshakbaeva A. Arinov B.
July 2023Multidisciplinary Digital Publishing Institute (MDPI)
Horticulturae
2023#9Issue 7
Studying the biostimulation effect of amino acids indicated their possible role in salt stress mitigation. In this investigation, six exogenous amino acids (alanine (Ala), arginine (Arg), glutamine (Glu), glycine (Gly), methionine (Met), and proline (Pro)) at 0.5 g/L were sprayed to evaluate their impact on lettuce plants cultivated under simulated salt stress conditions. Photosynthetic pigments, ion absorption, endogenous amino acids contents, catalase (CAT), and peroxidase (POD) enzyme activities were determined. A significant alleviation of salt stress was noticed when EAAs were used in the stress-induced plants, and applying Gly, Met, and Pro improved the plant status under salt stress conditions. The highest electric conductivity (568 μS/g) was testified from the control treatment (50 mM NaCl), while applying exogenous amino acids reduced electrical conductivity (EC), and the result was located between 469 and 558 μS/g. AAs alleviated Cl- anions in the lettuce leaves by 25% in comparison to control plants. Na+ cations were alleviated when the stress-induced plants were sprayed with amino acids. In contrast, applying amino acids promoted K+ uptake, and Arg presented the highest contents (3226 μg/g). AAs promoted chlorophyll (chl a and chl b) concentrations compared to the control treatment, and Met produced the maximum chl a content, while the carotene (car) contents significantly augmented when Gly, Met, and Pro were applied. AAs were highly generated in non-stressed treatment (Std) compared to the control. Under simulated salinity stress, Met and Pro application enhanced proteinogenic amino acids expression. Compared to Ctl treatment, peroxidase enzyme activities significantly diminished in the other treatments, which fell by over 40% when Gly, Met, and Pro were sprayed.
biostimulants , greenhouse , photosynthesis , protein , salinity stress , vegetable
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Horticulture Department, Faculty of Agriculture, Sohag University, Sohag City, 1646130, Egypt
Agrochemistry Department, Faculty of Soil Sciences, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
A.N. Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russian Federation
Plant Physiology and Immunity Laboratory, N.V. Tsitsin Main Botanical Garden of Russian Academy of Sciences, Moscow, 127276, Russian Federation
Department of Agrobiotechnology, Institute of Agriculture, RUDN University, Moscow, 117198, Russian Federation
Laboratory of Selection and Seed Production, Astrakhan State University, Astrakhan, 414056, Russian Federation
Department of Ecology, Astrakhan State University, Astrakhan, 414056, Russian Federation
Faculty of Agronomy, S. Seifullin Kazakh Agrotechnical University, Astana, 010000, Kazakhstan
Horticulture Department
Agrochemistry Department
A.N. Belozersky Institute of Physicochemical Biology
Plant Physiology and Immunity Laboratory
Department of Agrobiotechnology
Laboratory of Selection and Seed Production
Department of Ecology
Faculty of Agronomy
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