Effect of Different Elicitors and Preharvest Day Application on the Content of Phytochemicals and Antioxidant Activity of Butterhead Lettuce (Lactuca sativa var. capitata) Produced under Hydroponic Conditions. 2017

Jesús Omar Moreno-Escamilla, and Emilio Alvarez-Parrilla, and Laura A de la Rosa, and José Alberto Núñez-Gastélum, and Gustavo A González-Aguilar, and Joaquín Rodrigo-García
Departamento de Ciencias Químico-Biológicas, Instituto de Ciencias Biomédicas, Universidad Autónoma de Ciudad Juárez , Anillo envolvente del PRONAF y Estocolmo s/n, Ciudad Juárez, Chihuahua 32310, México.

The effect of four elicitors on phytochemical content in two varieties of lettuce was evaluated. The best preharvest day for application of each elicitor was chosen. Solutions of arachidonic acid (AA), salicylic acid (SA), methyl jasmonate (MJ), and Harpin protein (HP) were applied by foliar aspersion on lettuce leaves while cultivating under hydroponic conditions. Application of elicitors was done at 15, 7, 5, 3, or 1 day before harvest. Green lettuce showed the highest increase in phytochemical content when elicitors (AA, SA, and HP) were applied on day 7 before harvest. Similarly, antioxidant activity rose in all treatments on day 7. In red lettuce, the highest content of bioactive molecules occurred in samples treated on day 15. AA, SA, and HP were the elicitors with the highest effect on phytochemical content for both varieties, mainly on polyphenol content. Antioxidant activity also increased in response to elicitation. HPLC-MS showed an increase in the content of phenolic acids in green and red lettuce, especially after elicitation with SA, suggesting activation of the caffeic acid pathway due to elicitation.

UI MeSH Term Description Entries
D003517 Cyclopentanes A group of alicyclic hydrocarbons with the general formula R-C5H9. Cyclopentadiene,Cyclopentadienes,Cyclopentene,Cyclopentenes,Cyclopentane
D000085 Acetates Derivatives of ACETIC ACID. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the carboxymethane structure. Acetate,Acetic Acid Esters,Acetic Acids,Acids, Acetic,Esters, Acetic Acid
D000975 Antioxidants Naturally occurring or synthetic substances that inhibit or retard oxidation reactions. They counteract the damaging effects of oxidation in animal tissues. Anti-Oxidant,Antioxidant,Antioxidant Activity,Endogenous Antioxidant,Endogenous Antioxidants,Anti-Oxidant Effect,Anti-Oxidant Effects,Anti-Oxidants,Antioxidant Effect,Antioxidant Effects,Activity, Antioxidant,Anti Oxidant,Anti Oxidant Effect,Anti Oxidant Effects,Anti Oxidants,Antioxidant, Endogenous,Antioxidants, Endogenous
D001095 Arachidonic Acids Eicosatetraenoic Acids,Acids, Arachidonic,Acids, Eicosatetraenoic
D054883 Oxylipins Eighteen-carbon cyclopentyl polyunsaturated fatty acids derived from ALPHA-LINOLENIC ACID via an oxidative pathway analogous to the EICOSANOIDS in animals. Biosynthesis is inhibited by SALICYLATES. A key member, jasmonic acid of PLANTS, plays a similar role to ARACHIDONIC ACID in animals. Oxylipin
D018527 Hydroponics A technique for growing plants in culture solutions rather than in soil. The roots are immersed in an aerated solution containing the correct proportions of essential mineral salts. (From Concise Dictionary of Biology, 1990) Hydroponic
D018545 Lactuca Any of the various plants of the genus Lactuca, especially L. sativa, cultivated for its edible leaves. (From American Heritage Dictionary, 2d ed) Iceberg Lettuce,Lactuca sativa,Lettuce,Iceberg Lettuces,Lettuce, Iceberg,Lettuces,Lettuces, Iceberg
D020156 Salicylic Acid A compound obtained from the bark of the white willow and wintergreen leaves. It has bacteriostatic, fungicidal, and keratolytic actions. 2-Hydroxybenzoic Acid,o-Hydroxybenzoic Acid,ortho-Hydroxybenzoic Acid,2 Hydroxybenzoic Acid,Acid, 2-Hydroxybenzoic,Acid, Salicylic,Acid, o-Hydroxybenzoic,Acid, ortho-Hydroxybenzoic,o Hydroxybenzoic Acid,ortho Hydroxybenzoic Acid
D064209 Phytochemicals A broad range of biologically active compounds which occur naturally in plants having important medicinal and nutritional properties. Dietary Phytochemical,Plant Bioactive Compound,Plant Biologically Active Compound,Plant-Derived Chemical,Plant-Derived Compound,Bioactive Coumpounds, Plant,Biologically Active Coumpounds, Plant,Dietary Phytochemicals,Phytochemical,Phytonutrient,Phytonutrients,Plant Bioactive Compounds,Plant Biologically Active Compounds,Plant-Derived Chemicals,Plant-Derived Compounds,Bioactive Compound, Plant,Bioactive Compounds, Plant,Chemical, Plant-Derived,Chemicals, Plant-Derived,Compound, Plant Bioactive,Compound, Plant-Derived,Compounds, Plant Bioactive,Compounds, Plant-Derived,Coumpounds, Plant Bioactive,Phytochemical, Dietary,Phytochemicals, Dietary,Plant Bioactive Coumpounds,Plant Derived Chemical,Plant Derived Chemicals,Plant Derived Compound,Plant Derived Compounds

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