Differential Probing Response of Serpentine Leafminer, Liriomyza trifolii (Burgess), on Cos Lettuce

1994 ◽  
Vol 29 (3) ◽  
pp. 330-338 ◽  
Author(s):  
Gregg S. Nuessly ◽  
Russell T. Nagata
Keyword(s):  
Lactuca Sativa ◽  
Leaf Surface ◽  
The Other ◽  
Leafy Vegetables ◽  
Liriomyza Trifolii ◽  
Romaine Lettuce ◽  
Lactuca Sativa L ◽  
Leaf Mining ◽  
Choice Tests ◽  
Serpentine Leafminer

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.’

scholarly journals DIFFERENTIAL FEEDING PREFERENCE OF LEAFMINER ON FOUR COS LETTUCE CULTIVARS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 644a-644
Author(s):  
Russell T. Nagata ◽  
Gregg Nuessly
Keyword(s):  
Genetic Control ◽  
Lactuca Sativa ◽  
Leaf Surface ◽  
Feeding Preference ◽  
The Other ◽  
Leafy Vegetables ◽  
Liriomyza Trifolii ◽  
Leaf Mining ◽  
Significant Difference

Damage due to leaf mining by Liriomyza trifolii (Burgess) is a major problem in many leafy vegetables, especially lettuce. A hierarchy of feeding preference of leafminer on lettuce, Lactuca sativa L. cultivars 'Valmaine', `Parris Island Cos', `Floricos 83', and `Tall Guzmaine' was determined. Leafminers were given a choice of two plants. Observations on the number of times that leafminers probed the leaf surface to feed or oviposit in each plant was counted. `Tall Guzmaine' was significantly preferred in all combinations. Probe ratio of `Tall Guzmaine' verses the other cos lines ranged from 4:1 to 90:1. There were no significant difference between the other three lines, although `Valmaine' had the lowest count in most cases. Based on the pedigrees of the cultivars tested, the observed preferences appears to be under genetic control.

scholarly journals Effect of Plastic Mulch Color on Leaf Anatomy of Lettuce (Lactuca sativa L.)

2015 ◽  
Vol 3 (2) ◽  
pp. 105-108
Author(s):  
Edmar Franquera ◽  
Renato Mabesa
Keyword(s):  
Lactuca Sativa ◽  
Leaf Anatomy ◽  
Block Design ◽  
Anatomical Structure ◽  
The Other ◽  
Plastic Mulch ◽  
Romaine Lettuce ◽  
Lactuca Sativa L ◽  
Orange Yellow ◽  
Leaf Anatomical Structure

Two lettuce (Lactuca sativa L.) varieties (Looseleaf and Romaine) were grown with five colored (silver, red, orange, yellow, green) plastic mulches to determine their effects on the leaf anatomical structure of lettuce. The experiment was laid in a Split Plot Randomized Completely Block Design. The result of the study showed that Romaine lettuce (8.80) had a higher number of stomata compared with Looseleaf (6.73) however; in terms of stomata length the Looseleaf had longer stomata (18.63 µm) compared with Romaine (16.42 µm). More stomata were observed in lettuce grown with red plastic mulch. However, the number of stomata did not differ among the various colored plastic mulches. Longer stomata were observed in lettuce grown with red plastic mulch, compared with lettuce grown with the other colored plastic mulches. The study showed that the color of the plastic mulch had a significant effect on the leaf anatomy of lettuce and red plastic mulch could be used to enhance the length of the stomata which may affect the growth of the lettuce.

scholarly journals Growth and Physiological Characteristics of Lettuce (Lactuca sativa L.) and Rocket (Eruca sativa Mill.) Plants Cultivated under Photovoltaic Panels

2018 ◽  
Vol 46 (1) ◽  
pp. 206-212 ◽  
Author(s):  
Angeliki KAVGA ◽  
Georgios TRYPANAGNOSTOPOULOS ◽  
George ZERVOUDAKIS ◽  
Yiannis TRIPANAGNOSTOPOULOS
Keyword(s):  
Solar Radiation ◽  
Photosynthetic Rate ◽  
Lactuca Sativa ◽  
The Other ◽  
Physiological Characteristics ◽  
Eruca Sativa ◽  
Partial Shading ◽  
Photovoltaic Panels ◽  
Lactuca Sativa L ◽  
Other Hand

Energy demand of greenhouses is an important factor for their economics and photovoltaics can be considered an alternative solution to cover their electrical and heating needs. On the other hand, plants cultivated under different solar radiation intensities usually appear different physiological adaptations. The objective of this research was to investigate the effect of photovoltaic panels’ induced partial shading on growth and physiological characteristics of lettuce (Lactuca sativa L.) and rocket (Eruca sativa Mill.) plants. Our results indicate that lettuce productivity and the corresponding photosynthetic rate were not affected under the photovoltaic cultivation in comparison with the reference one. On the other hand, the rocket cultivation was less productive and showed lower photosynthetic rate under photovoltaic panels than in the reference greenhouse. The different physiological response between lettuce and rocket seems to be associated with the effect of environmental factors such as solar radiation intensity, temperature and humidity apart from the possible inherent characteristics of each plant species.

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

2007 ◽  
Vol 55 (25) ◽  
pp. 10366-10372 ◽  
Author(s):  
Hyun-Jin Kim ◽  
Jorge M. Fonseca ◽  
Ju-Hee Choi ◽  
Chieri Kubota
Keyword(s):  
Phenolic Compounds ◽  
Methyl Jasmonate ◽  
Lactuca Sativa ◽  
Romaine Lettuce ◽  
Lactuca Sativa L

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

2011 ◽  
pp. 1155-1160 ◽  
Author(s):  
L. Plamondon ◽  
L. Gaudreau ◽  
A. Gosselin ◽  
J. Caron ◽  
D. Van Winden ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
Romaine Lettuce ◽  
Lactuca Sativa L ◽  
Muck Soil

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

2007 ◽  
Vol 70 (7) ◽  
pp. 1717-1722 ◽  
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.

Cucurbitane Glucosides from Momordica charantia Leaves as Oviposition Deterrents to the Leafminer, Liriomyza trifolii

2006 ◽  
Vol 61 (1-2) ◽  
pp. 81-86 ◽  
Author(s):  
Daniel Bisrat Mekuria ◽  
Takehiro Kashiwagi ◽  
Shin-ichi Tebayashi ◽  
Chul-Sa Kim
Keyword(s):  
Methanol Extract ◽  
Leaf Surface ◽  
Oviposition Behavior ◽  
Polar Fraction ◽  
Momordica Charantia ◽  
Kidney Bean ◽  
Liriomyza Trifolii ◽  
Leaf Mining ◽  
High Degree ◽  
Bean Leaves

Abstract The American serpentine leaf mining fly, Liriomyza trifolii, whose larva feeds on more than 120 plant species is well characterized by its high degree of polyphagy. Observations on the oviposition behavior by L. trifolii demonstrated that among cucurbitaceous plants, Momordica charantia is rarely attacked by L. trifolii. The methanol extract of M. charantia leaves strongly deterred the females from ovipositing on kidney bean leaves treated at a concentration of 1 g leaf equivalent extract/ml. Analysis of the polar fraction of the methanol extract of M. charantia leaves resulted in the isolation of a novel cucurbitane glucoside, 7-O- β-ᴅ-glucopyranosyl-3,23-dihydroxycucurbita-5,24-dien-19-al, named momordicine IV, along with another known compound, momordicine II. Momordicine II and IV deterred oviposition by L. trifolii significantly when bioassays were carried out on kidney bean leaves treated at 75.6 and 20.3 μg/cm2 leaf surface, respectively. There was no synergistic effect on oviposition deterrent when the two compounds were combined in their natural abundance

scholarly journals Potential Next-Generation Probiotics Isolated from Romaine Lettuce (Lactuca sativa L. var. longifolia) Fermented Brine

2021 ◽  
Author(s):  
T E Tallei ◽  
Fatimawali ◽  
A M Sumual ◽  
M A Gani ◽  
G A V Pollo ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
Next Generation ◽  
Romaine Lettuce ◽  
Lactuca Sativa L

scholarly journals Phytochemical Responses to Salt Stress in Red and Green Baby Leaf Lettuce (Lactuca sativa L.) Varieties Grown in a Floating Hydroponic Module

Separations ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 175
Author(s):  
Giandomenico Corrado ◽  
Paola Vitaglione ◽  
Maria Giordano ◽  
Giampaolo Raimondi ◽  
Francesco Napolitano ◽  
...  
Keyword(s):  
Salt Stress ◽  
Lactuca Sativa ◽  
Leaf Traits ◽  
Leafy Vegetables ◽  
Response Models ◽  
Lactuca Sativa L ◽  
Harvest Strategy ◽  
Leaf Lettuce ◽  
Full Factorial

Lettuce (Lactuca sativa L.) is one of the most popular leafy vegetables, appreciated globally as a low-calorie food with bioactive compounds. The application of a low dose of abiotic stress is considered a sustainable pre-harvest strategy to modify the nutraceutical value of horticultural products. In this work, we explored the response of two differently colored (red or green) baby leaf lettuce varieties to four NaCl concentrations in the nutrient solution (from 1 to 30 mM), using a full factorial design. We focused on leaf morphological parameters and possible phytochemical enhancement of the main polyphenols and anthocyanins, analyzed by LC-MS. The response to low-to-moderate salt stress exposure was affected mainly by salt concentration for leaf traits or by the cultivar for leaf color, with very limited factors’ interactions. Multivariate analysis indicated a predominant role of the genotypic factor in shaping differences in the two weeks growing cycle for baby leaf lettuce. Phytochemically, different dose–response models to sub-optimal saline conditions may be applied to the various compounds. A significant hormetic stimulation was present only for cyanidin-malonyl glucoside, the main anthocyanin present in the red cultivar.

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