scholarly journals Assessment of morphophysiological characteristics of lettuce Lactuca sativa L. after exposure to simulated space flight conditions

2021 ◽  
Vol 6 (48) ◽  
pp. 35-35
Author(s):  
Elizaveta Kazakova ◽  
Marina Podobed ◽  
Alexander Prazyan ◽  
Daria Babina ◽  
Ekaterina Shesterikova ◽  
...  

A number of morphophysiological parameters of the candidate crop Lactuca sativa L. for growing in space after influence of the combined action of proton irradiation and clinostating were assessed. It was found that the effect of simulated space conditions reduces the surface area of leaf blades, the mass of roots and shoots of lettuce plants, was not change the number of true leaves. After 20 days of cultivation of L. sativa after irradiation and clinostating, the values of the parameters of the length of shoots, roots, and chlorophyll fluorescence were at the level of control plants. The results obtained contribute to the development of space crop production. Key words: GROWING PLANTS IN SPACE, SALAD CROPS, SOWED LETTUCE, IRRADIATION, PROTONS, STRESS, CLINOSTAT

2018 ◽  
Vol 7 (3) ◽  
pp. 82
Author(s):  
Lina Maria Caceres Diaz ◽  
Claudia Campos ◽  
Gideon Oron

This study examines the prospects for using Hydra viridissima toxicity test 96-h LC50, served as a model invertebrate, Lactuca sativa L. was applied for seeds toxicity test (120-h IC50) and a model plant for an acute toxicity assessment of heavy metals content in water. The heavy metals used to assess the acute toxicity of the water utilized for agricultural irrigation in arid regions includes cadmium (CdCl2.2H2O), chromium (K2Cr2O7), zinc (ZnSO4. 7H2O), and boron (H3BO3). A grading of the substances was conducted, and it was found that the toxicity levels for H. viridissima and L. sativa were, with the least harmful first: B < Cr < Zn < Cd and Zn < B < Cr < Cd, respectively. Results indicate that H. viridissima was a more sensitive indicator of toxicity for all of the evaluated substances. However, L. sativa could also be used successfully to rank toxicants in order of their potential hazards.


Life ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 303
Author(s):  
Jiri Kudrna ◽  
Frantisek Hnilicka ◽  
Jan Kubes ◽  
Pavla Vachova ◽  
Helena Hnilickova ◽  
...  

This study analyzes the effects of acetaminophen (APAP) as a contaminant on physiological characteristics of lettuce plants (Lactuca sativa L.). Experiments were provided in an experimental greenhouse with semi-controlled conditions. The effect of different amounts of contaminant was evaluated by using regression analysis. Plants were grown in five concentrations of APAP: 0 µM, 5 µM, 50 µM, 500 µM, and 5 mM for 14 days in two variants, acute and chronic. The obtained results show that the monitored parameters were demonstrably influenced by the experimental variant. Plants are more sensitive to chronic contamination compared to acute. Significant (p < 0.05) deviation in photosynthesis and fluorescence was observed compared to the control in different variants. The highest doses of APAP reduced the intensity of photosynthesis by a maximum of more than 31% compared to the control. A reduction of 18% was observed for the fluorescence parameters. Pronounced correlation was described between chlorophyll fluorescence parameters and yield mainly under APAP conditions. The amount of chlorophyll was influenced by exposure to APAP.


2018 ◽  
Vol 235 ◽  
pp. 70-77 ◽  
Author(s):  
Katarzyna Kowalczyk ◽  
Leszek Sieczko ◽  
Vasilij Goltsev ◽  
Hazem M. Kalaji ◽  
Janina Gajc-Wolska ◽  
...  

2021 ◽  
Vol 17 (21) ◽  
pp. 283
Author(s):  
Bautista Olivas Ana Laura ◽  
Fernandez David Rene ◽  
Alvarez Chavez Clara Rosalia ◽  
Mexia Sanchez Angel Carlos ◽  
Mendoza Cariño Mayra ◽  
...  

El cambio de uso del suelo con fines agrícolas bajo esquemas de manejo agrícola y uso del agua poco eficientes, originan suelos infértiles. Para el cultivo de hortalizas se estudian técnicas que produzcan altos rendimientos con los menores costos económicos y ambientales. Los objetivos del estudio fueron estimar y comparar el rendimiento de la lechuga (Lactuca sativa L.) en los sistemas productivos acuapónico (SA) e hidropónico (SH). La metodología comprendió dos etapas: el establecimiento de los sistemas productivos tipo Nutrition Film Technique (NFT) y el monitoreo del desarrollo del cultivo en ambos sistemas. Las bases de datos y el tratamiento estadístico se realizaron en el programa Excel de Windows Versión 10. La prueba t de student con un nivel de significancia de 0.05 indicó el peso promedio de las lechugas: 0.056 kg (± 0.005 kg) en el SA, y 0.097 kg (± 0.007 kg) en el SH. El SH generó mayor rendimiento (1.847 kg/m2) que el SA (1.080 kg/m2); lo que se atribuyó a que el SH contó con los nutrientes necesarios desde el inicio del cultivo, por la aplicación de fertilizante. La temperatura alta influyó en el comportamiento de los peces del SA, ya que provocaron menor consumo alimenticio y de aporte de desechos orgánicos al agua que, promovieron una baja cantidad de nutrientes y afectaron la producción y el rendimiento del cultivo. Se recomiendan la generación de conocimiento para complementar los resultados obtenidos, como el gasto hídrico y su comparación con los sistemas de cultivo de lechuga tradicionales. Land use change for agriculture under poor farm management and inefficient water use, produces infertile soils. For green vegetable farming, there are some techniques for the achievement of high crop yields with the lowest economic and environmental costs. The study objectives were to estimate and compare lettuce yields (Lactuca sativa L.) in aquaponic (SA) and hydroponic (SH) production systems. Methodology encompassed two stages: the establishing of a Nutrition Film Technique (NFT) productive system and the monitoring of the crop growing in both systems. Database integration and statistical analyses were performed using Windows Excel version 10. Average lettuce weight using t-test (significance level of 0.05) were 0.056 kg (± 0.005 kg) in SA, y 0.097 kg (± 0.007 kg) in SH. SH reached higher yields (1.847 kg/m2) than SA (1.080 kg/m2); likely due to the fact that SH had all needed nutrients since the beginning of the crop, by applying fertilizer. High temperature influenced fish behavior in SA, observing lower food consumption and organic waste supply to the water, releasing low nutrient load that affected crop production and yield. More studies are recommended in order to deepen the outcomes, such as those including water flow and the comparison with conventional lettuce crop systems.


Sign in / Sign up

Export Citation Format

Share Document