Effect of Methyl Jasmonate on Phenolic Compounds and Carotenoids of Romaine Lettuce (Lactuca sativa L.)

Leaf mining damage by serpentine leafminers, Liriomyza trifolii (Burgess) (Diptera: Agromyzidae), is a major problem of many leafy vegetables especially lettuce. A hierarchy of leaf probing preference by L. trifolii on romaine lettuce (Lactuca sativa L.) cultivars ‘Floricos 83’ (FC), ‘Parris Island Cos’ (PI), ‘Tall Guzmaine’ (TG), and ‘Valmaine’ (VL) was determined. Based on stipple counts (puncture wounds in the leaf surface), L. trifolii preferred TG by an experiment-wide average of 3:1 over the other cultivars. In choice tests where L. trifolii were able to select their preferred cultivar, TG was preferred 2.2:1 to 5.5:1 over the over varieties. On 12-leaf stage TG plants, eight female flies produced means ± SEM of 664.2 ± 165.8, 1,581.8 ± 333.8, and 2,084.5 ± 242.6 stipples per plant after 24, 48, and 72 h exposures, respectively. Preference for TG was maintained in no-choice tests where TG was preferred 1.8:1 to 2.6:1 over the other cultivars. Stipple counts on FC, PI, and VL did not vary significantly between choice and no-choice tests, but nearly twice as many stipples per plant were found on TG in choice than in no-choice tests. More probing occurred on all cultivars on the youngest fully expanded leaves in the middle of the plants than on leaves toward the bottom or top of the plants. Preference for these middle leaves was more pronounced on TG than on the other cultivars. The differences in stipple rates followed the pedigrees of the cultivars tested. The character(s) preferred by L. trifolii were apparently introduced into the lineage with a cross to ‘Paris White.’

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Effect of Harpin protein as an elicitor on the content of phenolic compounds and antioxidant capacity in two hydroponically grown lettuce (Lactuca sativa L.) varieties.

Food Science and Technology ◽

10.1590/fst.20417 ◽

2019 ◽

Vol 39 (1) ◽

pp. 72-77 ◽

Cited By ~ 3

Author(s):

Joaquín RODRIGO-GARCÍA ◽

Benjamín Alejandro NAVARRETE-LABORDE ◽

Laura Alejandra de la ROSA ◽

Emilio ALVAREZ-PARRILLA ◽

José Alberto NÚÑEZ-GASTÉLUM

Keyword(s):

Phenolic Compounds ◽

Antioxidant Capacity ◽

Lactuca Sativa ◽

Lactuca Sativa L ◽

Harpin Protein ◽

Hydroponically Grown

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Phytotoxic and Enzymatic Study of Philodendron meridionale on seeds of Lactuca sativa L.

Research Society and Development ◽

10.33448/rsd-v10i1.11336 ◽

2021 ◽

Vol 10 (1) ◽

pp. e5610111336

Author(s):

Juliane Nadal Dias Swiech ◽

Daniela Gaspardo Folquitto ◽

Vanessa Barbosa Bobek ◽

Amanda Migliorini Urban ◽

Fernando Cesar Martins Betim ◽

...

Keyword(s):

Phenolic Compounds ◽

Lactuca Sativa ◽

Dry Mass ◽

Cellular Respiration ◽

Negative Effects ◽

Methanolic Extracts ◽

Lactuca Sativa L ◽

Soxhlet Apparatus ◽

Enzymatic Study ◽

And Oxidative Stress

In an effort to identify novel biopesticides, the present study aimed to assess the effects of Philodendron meridionale (Buturi & Sakur) stem and leaf ketonic and ethanolic extracts (SKE, SEE, LKE, and LEE, respectively) on the germination, growth, root respiration, and enzymatic activities of Lactuca sativa L. seeds, and to measure the associated saponins, phenolics, and flavonoids that may possess herbicidal, pharmaceutical, or pesticidal activities. The extracts were obtained using a modified Soxhlet apparatus and methanolic extracts of 0.1, 0.25, 0.5, 0.75 and 1.0 mg.mL-1 were tested, with water and methanol as a control. The presence of saponins and the concentration of phenolic compounds were determined. Allelopathic activity was evaluated in tests of germination, growth, cellular respiration and enzymatic activity. The presence of saponins and the concentration of phenolic compounds equivalent to 225.12 for LKE, 240.45 for LEE, 193.28 for SKE, and 265.14 for SEE (mg·g-1.gallic acid), and flavonoids 52.74 for LKE, 54.31 for LEE, 72.74 for SKE, and 67.21 for SEE (mg.g-1.quercetin) were determined. The allelopathy of the P. meridionale extracts against L. sativa was confirmed through negative effects on L. sativa seed germination, radical growth and morphology, dry mass, and the concentrations of α-amylase (EC 3.2.1.1), ascorbate peroxidase (EC 1.11.1.11), catalase (EC 1.11.1.6), and polyphenol oxidase (EC 1.10.3.1). It was likely that the allelopathic action of the P. meridionale extracts was related to its effects on the membrane permeability and oxidative stress of the treated L. sativa seeds. The P. meridionale extracts contained saponins, calcium oxalate crystals, and flavonoids, including phenolic compounds, which are known allelochemicals with herbicidal activities.

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OPTIMIZATION OF IRRIGATION OF ROMAINE LETTUCE (LACTUCA SATIVA L.) CULTIVATED IN MUCK SOIL

Acta Horticulturae ◽

10.17660/actahortic.2011.893.133 ◽

2011 ◽

pp. 1155-1160 ◽

Cited By ~ 1

Author(s):

L. Plamondon ◽

L. Gaudreau ◽

A. Gosselin ◽

J. Caron ◽

D. Van Winden ◽

...

Keyword(s):

Lactuca Sativa ◽

Romaine Lettuce ◽

Lactuca Sativa L ◽

Muck Soil

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Assessment of Contamination Potential of Lettuce by Salmonella enterica Serovar Newport Added to the Plant Growing Medium

Journal of Food Protection ◽

10.4315/0362-028x-70.7.1717 ◽

2007 ◽

Vol 70 (7) ◽

pp. 1717-1722 ◽

Cited By ~ 44

Author(s):

NIRIT BERNSTEIN ◽

SHLOMO SELA ◽

SARIT NEDER-LAVON

Keyword(s):

Developmental Stage ◽

Root System ◽

Lactuca Sativa ◽

Salmonella Enterica ◽

Romaine Lettuce ◽

Salmonella Newport ◽

Aerial Parts ◽

Lactuca Sativa L ◽

Growing Medium

The capacity of Salmonella enterica serovar Newport to contaminate Romaine lettuce (Lactuca sativa L. cv. Nogal) via the root system was evaluated in 17-, 20-, and 33-day-old plants. Apparent internalization of Salmonella via the root to the above-ground parts was identified in 33- but not 17- or 20-day-old plants and was stimulated by root decapitation. Leaves of lettuce plants with intact and damaged roots harbored Salmonella at 500 ± 120 and 5,130 ± 440 CFU/g of leaf, respectively, at 2 days postinoculation but not 5 days later. These findings are first to suggest that Salmonella Newport can translocate from contaminated roots to the aerial parts of lettuce seedlings and propose that the process is dependent on the developmental stage of the plant.

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