scholarly journals The Role of Sulphur Application and Dicyandiamide Comparing with Mineral Fertilization Npk on Chemical Constituent of Lettuce Plant (Lactuca Sativa L.)

2016 ◽  
Vol 7 (9) ◽  
pp. 687-692
Author(s):  
K. Fouda
Keyword(s):  
Lactuca Sativa ◽  
Chemical Constituent ◽  
Lettuce Plant ◽  
Mineral Fertilization ◽  
Lactuca Sativa L

scholarly journals EVALUATION OF METEOROLOGICAL ELEMENTS AND LETTUCE (Lactuca sativa, L.) YIELD RELATED TO GEOGRAPHIC ORIENTATION OF POLYETHYLENE GREENHOUSES

Irriga ◽  
2002 ◽  
Vol 7 (3) ◽  
pp. 176-184
Author(s):  
Cláudio Marcio Pereira de Souza ◽  
Antonio Evaldo Klar ◽  
Luiza Helena Duenhas
Keyword(s):  
Lactuca Sativa ◽  
Irrigation System ◽  
Sao Paulo ◽  
São Paulo ◽  
Lettuce Plant ◽  
Plant Yield ◽  
Agricultural Engineering ◽  
Lactuca Sativa L ◽  
Engineering Department ◽  
Meteorological Elements

EVALUATION OF METEOROLOGICAL ELEMENTS AND LETTUCE (Lactuca sativa, L.) YIELD RELATED TO GEOGRAPHIC ORIENTATION OF POLYETHYLENE GREENHOUSES   Cláudio Márcio Pereira de SouzaAntonio Evaldo Klar*Department of Agricultural Engineering, College of Agricultural Sciences, State University of São Paulo, P.O. 237, CEP 18603-970, Botucatu – SP. E-mail: [email protected]* Scientific Researcher of CNPqLuiza Helena DuenhasEMBRAPA Semi Árido, P.O. 23, CEP 56300–970, Petrolina – PE.   1 ABSTRACT  This experiment was carried out at the Agricultural Engineering Department, FCA/UNESP, Botucatu–SP aiming to study  the geographic orientation influence of two plastic tunnels (East/West and North/South based on the magnetic North) on lettuce plant (Lactuca sativa L, cv. Elisa) behavior and on the evaporation distribution uniformity inside the tunnels. The plants were sowed on 05/05/1999, transplanted on 05/29/1999 and harvested on 06/31/1999. Tensiometers were used to monitore soil water potentials. A drip irrigation system was used. Both tunnels received A Class pan and thermohygrographes in the center and 3 m apart small evaporimeters set at 3 heights (0.50 m, 1.00 m and 1.50 m). Through geostatistical analysis, there was not neither spatial dependency nor spatial variability of evaporation in both tunnels. However, the height of evaporimeters showed statistical differences: the 1.50 m height evaporimeter had slower evaporation than those from other heights. The air temperature, relative humidity and vapor pressure deficit averages were not statistically significant in both greenhouses when they were compared to those from the outside. A Class pan evaporation values were higher outside the tunnels than inside them, but there were no differences between both tunnels for this variable. The lettuce plant yield was not influenced by tunnel orientation, but there were significant differences on plant yield among beds inside each tunnel.  Keywords: evaporation, irrigation, greenhouse.   SOUZA, C. M. P., KLAR, A. E., DUENHAS, L. H. AVALIAÇÃO DE ELEMENTOS METEOROLÓGICOS E PRODUÇÃO DE ALFACE (Lactuca sativa L.) AFETADOS PELA ORIENTAÇÃO GEOGRÁFICA DE ESTUFAS DE POLIETILENO.   2 RESUMO  O experimento foi realizado na área experimental do Departamento de Engenharia Rural da Faculdade de Ciências Agronômicas – Unesp/Botucatu, Estado de São Paulo, em duas estufas dispostas em diferentes orientações geográficas, Leste/Oeste e Norte/Sul. A alface (Lactuva sativa L.) cv. Elisa foi cultivada em ambas estufas, sendo semeada em 05/05/99, transplantada em 29/05/99 e colhida em 31/06/99. Utilizou-se tensiômetros para monitorar o potencial de água no solo para realizar o manejo do sistema de irrigação por gotejamento. Microevaporímetros eqüidistantes de 3 m e colocados em 3 alturas, 0.50, 1.00 e 1.50 m, termohigrógrafos e tanques Classe “A” foram instalados nas duas estufas. Através de análise geoestatística, não se observou dependência espacial nem variabilidade espacial da evaporação nas duas estufas. Entretanto, a altura dos evaporímetros apresentou diferenças significativas: a evaporação à altura de 1.50 foi menor que nas outras duas.As médias de temperatura, umidade relativa e déficit de pressão de vapor do arnão diferiram estatisticamente entre as estufas e o ambiente externo. Os valores médios de evaporação de água no tanque Classe “A” instalado fora das estufas diferiram estatisticamente quando comparados com os instalados no interior das estufas, porém, entre as orientações não se constatou diferença significativa. Pôde-se verificar que não houve diferença significativa das características agronômicas da alface em ambas orientações estudadas. No entanto, houve diferença significativa para essas características entre os canteiros no interior das mesmas, havendo variância espacial para os dados de matéria fresca apenas na estufa N/S.  UNITERMOS: evaporação, irrigação, estufa.

Effect of Vermicompost on the Growth and Yield of Lettuce Plant (Lactuca sativa L. var. crispa)

2018 ◽  
Vol 21 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Sevinç Adiloğlu ◽  
Funda Açıkgöz ◽  
Yusuf Solmaz ◽  
Ece Çaktü ◽  
Aydın Adiloğlu
Keyword(s):  
Lactuca Sativa ◽  
Growth And Yield ◽  
Lettuce Plant ◽  
Lactuca Sativa L

The high reducing sugar content during germination contributes to desiccation damage in lettuce (Lactuca sativa L.) radicles

1995 ◽  
Vol 5 (3) ◽  
pp. 145-149 ◽  
Author(s):  
P. van der Toorn ◽  
B. D. McKersie
Keyword(s):  
Hydroxyl Radicals ◽  
Lactuca Sativa ◽  
Sugar Content ◽  
Primary Source ◽  
Reducing Sugar ◽  
Amino Groups ◽  
Lettuce Seeds ◽  
Lactuca Sativa L ◽  
Lipid Aldehydes

AbstractAt the time of protrusion, radicles of lettuce seeds became susceptible to desiccation damage. Concomitant with radicle elongation, both the reducing sugar content and the amount of lipid-aldehydes increased. The role of the hydroxy- and lipid-aldehydes in browning reactions that occurred during desiccation and re-imbibition was analysed. It was concluded that both types of aldehydes reacted with amino-groups during desiccation and that the increase in lipid-aldehydes during germination could be due to the augmented reducing sugar content. Therefore, the high reducing sugar content in radicles of germinated lettuce seeds may be the primary source of hydroxyl radicals, and thereby, a principal cause of desiccation damage.

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.

Role of sucrose in modulating the low‐nitrogen‐induced accumulation of phenolic compounds in lettuce ( Lactuca sativa L.)

2020 ◽  
Vol 100 (15) ◽  
pp. 5412-5421
Author(s):  
Weiwei Zhou ◽  
Xin Liang ◽  
Yuxue Zhang ◽  
Peibin Dai ◽  
Bin Liang ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Lactuca Sativa ◽  
Lactuca Sativa L ◽  
Low Nitrogen

scholarly journals Inflorescence Development and the Role of LsFT in Regulating Bolting in Lettuce (Lactuca sativa L.)

2018 ◽  
Vol 8 ◽  
Author(s):  
Zijing Chen ◽  
Yingyan Han ◽  
Kang Ning ◽  
Yunyu Ding ◽  
Wensheng Zhao ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
Inflorescence Development ◽  
Lactuca Sativa L

Effect of proline on biochemical and molecular mechanisms in lettuce (Lactuca sativa L.) exposed to UV-B radiation

2017 ◽  
Vol 16 (2) ◽  
pp. 246-254 ◽  
Author(s):  
Ozkan Aksakal ◽  
Dilruba Tabay ◽  
Aslıhan Esringu ◽  
Feyza Icoglu Aksakal ◽  
Nevzat Esim
Keyword(s):  
Oxidative Stress ◽  
Lactuca Sativa ◽  
Molecular Mechanisms ◽  
Lactuca Sativa L ◽  
Radiation Induced

The purpose of the present study was to evaluate the role of proline (Pro) in relieving UV-B radiation-induced oxidative stress in lettuce.

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