scholarly journals The Effects of Different Salinity Levels (NaCI) on Yield and Plant Growth in Soilless Culture Head Lettuce (Lactuca Sativa L.)

2020 ◽  
pp. 1370-1381
Author(s):  
Özlem AKAT SARAÇOĞLU ◽  
Cenk KILIÇ ◽  
Hale DUYAR
Keyword(s):  
Plant Growth ◽  
Lactuca Sativa ◽  
Soilless Culture ◽  
Lactuca Sativa L ◽  
Salinity Levels

scholarly journals Rhizobium laguerreae Improves Productivity and Phenolic Compound Content of Lettuce (Lactuca sativa L.) under Saline Stress Conditions

Foods ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1166 ◽  
Author(s):  
Miguel Ayuso-Calles ◽  
Ignacio García-Estévez ◽  
Alejandro Jiménez-Gómez ◽  
José D. Flores-Félix ◽  
M. Teresa Escribano-Bailón ◽  
...  
Keyword(s):  
Plant Growth ◽  
Phenolic Compound ◽  
Phenolic Acids ◽  
Lactuca Sativa ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Saline Stress ◽  
Lactuca Sativa L ◽  
Plant Growth Promoting

Lettuce (Lactuca sativa L.) is a widely consumed horticultural species. Its significance lies in a high polyphenolic compound content, including phenolic acids and flavonols. In this work, we have probed the ability of Rhizobium laguerreae HUTR05 to promote lettuce growth, under in vitro and greenhouse conditions (both non-saline and saline conditions). This strain has shown several in vitro plant growth promotion mechanisms, as well as capacity to colonize lettuce seedlings roots. We have analyzed the effect of the rhizobacterium inoculation on mineral and bioactive compounds in lettuce, under greenhouse conditions, and found a rise in the content of certain phenolic acids and flavonoids, such as derivatives of caffeoyl acid and quercetin. The genome analysis of the strain has shown the presence of genes related to plant growth-promoting rhizobacteria (PGPR) mechanisms, defense from saline stress, and phenolic compound metabolism (such as naringenin-chalcone synthase or phenylalanine aminotransferase).

UTILIZAÇÃO DE ÁGUAS SALOBRAS NO CULTIVO HIDROPÔNICO DA ALFACE

Irriga ◽  
2010 ◽  
Vol 15 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Rafaelly Suzanye Santos ◽  
Daniel Da Costa Dantas ◽  
Fabiola Pascoal Nogueira ◽  
Nildo Da Silva Dias ◽  
Miguel Ferreira Neto ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Lactuca Sativa ◽  
Growth And Development ◽  
Dry Matter ◽  
Hydroponic System ◽  
Lactuca Sativa L ◽  
Salinity Increase ◽  
Salinity Levels ◽  
Cultivar Variation ◽  
Nutrient Solutions

A salinidade é um problema sério para a agricultura, pois limita o crescimento e o desenvolvimento das plantas sensíveis. A tolerância das culturas à salinidade é influenciada por diversos fatores, incluindo estágio de crescimento, condições ambientais, espécies e cultivares de uma mesma espécie. Foram testados três salinidades da água no preparo da solução nutritiva (0,5; 3,0 e 6,0 dS m-1) em três cultivares de alface (Babá de verão, Verônica e Quatro estações) em sistema hidropônico sob condições protegidas com a finalidade de avaliar a tolerância das cultivares à salinidade. Não foram observados diferenças entre as cultivares estudadas quanto à salinidade da água de irrigação. O aumento da salinidade da água de irrigação provocou redução do número de folhas e da matéria seca da parte aérea.   UNITERMOS: Lactuca sativa L., solução nutritiva, condutividade elétrica.     SANTOS, R. S.; DANTAS, D. C.; NOGUEIRA, F. P.; DIAS, N. S.; FERREIRA NETO, M.; GURGEL. M. T. BRACKISH WATER USE ON HYDROPONIC LETTUCE     2 ABSTRACT   Salinity is a serious problem for agriculture because it can limit the growth and development of salt-sensitive plants. Salt tolerance is affected by several factors, including the growth stage, environmental conditions, species and cultivar variation for each species. In order to compare salt tolerance, three water salinity levels were used to prepare nutrient solutions (0.5; 3.0 and 6.0 dS m-1) and were applied on three different lettuce cultivars in a hydroponic system under greenhouse (cvs. Babá de verão, Verônica and Quatro estações). Differences in salt tolerance of the nutrient solutions were not observed for the studied cultivars. The salinity increase in the nutrient solutions reduced the leaf number and dry matter biomass.   KEYWORDS: Lactuca sativa L., soil solution, electric conductivity.    

FUNGICIDAL ACTIVITY OF VORLEX AND ACCUMULATION OF LINURON IN A VORLEX-LINURON TREATED SOIL

1980 ◽  
Vol 60 (4) ◽  
pp. 651-656 ◽  
Author(s):  
E. B. ROSLYCKY
Keyword(s):  
Plant Growth ◽  
Lactuca Sativa ◽  
Fungicidal Activity ◽  
Drastic Reduction ◽  
Fungal Population ◽  
Treated Soil ◽  
Lactuca Sativa L ◽  
Initial Effect

Recommended concentrations of Vorlex and linuron exerted little initial effect on bacterial and actinomycete populations in a muck, whereas Vorlex caused drastic reduction in that of the fungi. This resulted in linuron accumulation in the soil which was deleterious to growth of Lactuca sativa L. New fungal population produced by the survivors was resistant to subsequent Vorlex treatments, but was linuron passive. Proliferation of the surviving fungi was accompanied by appreciable and lasting increases in the bacterial and actinomycete populations. Absence of pathogenic symptoms on lettuce plants due to any of these organisms precluded selection or enrichment of pathogens potentially present in the soil. The findings demonstrated the consequence of this pesticide combination on non-target microbiota, the accumulation of linuron, and plant growth.

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