Short-Term Nitrate Limitation Prior to Harvest Improves Phenolic Compound Accumulation in Hydroponic-Cultivated Lettuce (Lactuca sativa L.) without Reducing Shoot Fresh Weight

2018 ◽  
Vol 66 (40) ◽  
pp. 10353-10361 ◽  
Author(s):  
Weiwei Zhou ◽  
Yao Chen ◽  
Huaping Xu ◽  
Xin Liang ◽  
Yan Hu ◽  
...  
Keyword(s):  
Phenolic Compound ◽  
Lactuca Sativa ◽  
Fresh Weight ◽  
Short Term ◽  
Shoot Fresh Weight ◽  
Lactuca Sativa L

scholarly journals Preparation Protein Hydrolysates from Fish by-product and Study Effected on Lettuce (Lactuca sativa L.) Growth, Yield, Quality and Enhanced Salt Tolerance

2019 ◽  
Vol 32 ◽  
pp. 246-255
Author(s):  
Haider M.H. Al-Malieky ◽  
Awatif N. Jerry
Keyword(s):  
Lactuca Sativa ◽  
Foliar Application ◽  
Block Design ◽  
Total Yield ◽  
Winter Season ◽  
Protein Hydrolysates ◽  
Control Treatment ◽  
Fresh Weight ◽  
Shoot Fresh Weight ◽  
Lactuca Sativa L

The experiment was carried out during the winter season 2019-2018 in Al-Hartha district, Basrah Governorate to study the effects of fish by-product prepared by Alcalase and Flavourzyme enzyme as a foliar application on lettuce (Lactuca sativa L.) yield and quality grown under salinity conditions. Fish by-product protein hydrolysate was spray-applied (3 and 6ml. L-1) additional to control treatment (spraying with water) referred to (T0-T4) at four (S4), six(S6) times after 20 days transplanting at10-day intervals. Randomized Complete Block Design (R.C.B.D.) was used as factorial experiment. Treatment means were compared by using Least Significant Differences (L.S.D.) at a probability of 0.05. The results showed that spraying with protein hydrolysates had a significant effect on most studied characters compared to control treatment. Results showed that foliar application with (T2) significantly increased the total leaves number, leaves area, carbohydrate ,proline, shoot fresh weight of plant, dry matter, total soluble solids (TSS %) and total yield additional to significantly decreased in nitrate contents, while foliar application with (T4) significantly increased in the plant height and stem height. The results showed that spraying six times (S6) were significant increases in these growth characters comparing with four sprays (S4). The interaction between treatments and spraying number show significantly increased in some characters, the (T2 S6) had the highest value shoot fresh weight 762.5g and total yield 17.899 tone.donum-1.

scholarly journals EC Sensitivity of Hydroponically-Grown Lettuce (Lactuca sativa L.) Types in Terms of Nitrate Accumulation

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 315
Author(s):  
Noémi Kappel ◽  
Ildikó Fruzsina Boros ◽  
Francia Seconde Ravelombola ◽  
László Sipos
Keyword(s):  
Lactuca Sativa ◽  
Nitrate Content ◽  
Saline Condition ◽  
Fresh Weight ◽  
Nitrate Level ◽  
Nitrate Accumulation ◽  
Strong Negative Correlation ◽  
Lactuca Sativa L ◽  
Hydroponically Grown ◽  
European Markets

The goal of this research was to investigate the effect of electrical conductivity (EC) levels of the nutrient solution on the fresh weight, chlorophyll, and nitrate content of hydroponic-system-grown lettuce. The selected cultivars are the most representative commercial varieties grown for European markets. Seven cultivars (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ and ‘Rouxaï’) of three Lactuca sativa L. types’ (butterhead, loose leaf, and oak leaf) were grown in a phytotron in rockwool, meanwhile the EC level of the nutrient solutions were different: normal (<1.3 dS/m) and high (10 dS/m). The plants in the saline condition had a lower yield but elevated chlorophyll content and nitrate level, although the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels. The results and the special characteristic of the lollo-type cultivars showed that the nitrate level could be very different due to salinity (‘Limeira’ had the lowest (684 µg/g fresh weight (FW)) and ‘Cencibel’ had the highest (4396 µg/g FW)). There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value, while this relationship was not shown in the saline condition. Under the saline condition, cultivars acted differently, and all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW).

scholarly journals Respons Pertumbuhan Dan Produksi Dua Varietas Selada (Lactuca Sativa L.) Terhadap Pemberian Berbagai Sumber Nitrogen

1970 ◽  
Vol 5 (2) ◽  
pp. 177-182
Author(s):  
Jepriwira K. Ginting ◽  
Jonis Ginting ◽  
Nini Rahmawati
Keyword(s):  
Plant Height ◽  
Lactuca Sativa ◽  
Block Design ◽  
Organic Fertilizer ◽  
Chicken Manure ◽  
Fresh Weight ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Sample Application ◽  
Number Of Leaves

The research aims to determine the growth and production response of two varieties of lettuce (Lactuca sativa L.) to the provision of various sources of nitrogen. This research was conducted in Lambar village, Tigapanah sub-district, Karo regency, Sumatera Utara Province with altitude of ± 1200 meters above sea level, which started on July to September 2017. This research used a factorial randomized block design with 2 factors namely varieties of lettuce (crop and lettuce) and sources of nitrogen (urea fertilizer, chicken manure and Liquid organic fertilizer of rabbit urine). The parameters observed were plant height, greenish leaves, crop circle, fresh weight of plant per sample and fresh weight of plant per plot. The results showed that both varieties were significantly different in the parameters of plant height, greenish leaves, the number of leaves, and the fresh weight of the plant per sample. Application of nitrogen source showed differences in plant height at 10 weeks after move planting and fresh weight of plant per sample.

scholarly journals Produksi selada (Lactuca sativa l.) dengan penyinaran lampu led merah dan biru di malam hari pada teknologi hidroponik sistem terapung termodifikasi

2018 ◽  
Vol 2 (1) ◽  
pp. 79 ◽  
Author(s):  
Ardiansyah Azhary Suhandoko ◽  
Sumarsono Sumarsono ◽  
Endang Dwi Purbajanti
Keyword(s):  
Lactuca Sativa ◽  
Nutrient Concentration ◽  
Light Emitting Diode ◽  
Dry Weight ◽  
Fresh Weight ◽  
Light Emitting ◽  
Blue Led ◽  
Lactuca Sativa L ◽  
Floating System ◽  
Led Lights

This research has an aim to observe the production of lettuce (Lactuca sativa L.) on hydroponic technology of floating system with red and blue LED (Light Emitting Diode) at night. This research was conducted inside the Screenhouse in which located on the top of Griya Kads House building, Bulusan Village, Tembalang Sub-district from May to June 2017. The research was conducted by 3x3 factorial experiments in Nested Design with 3 replications. The first factor was 0, 1.5 and 3 hours irradiation of red and blue LED lights at night. The second factor was 3, 5 and 7 ml/liter of AB mix nutrient concentration which was nested in the first factor. The data collected were fresh weight, dry weight and root canopy ratio. The results of the study showed that the treatment of AB mix nutrient concentration had no significant effect on all parameters. The production of lettuce with level of 5 ml concentration of AB mix was quite good, yet 3 ml and 7 ml levels didn’t improve lettuce production. The duration of red and blue LED irradiation only resulted in an increase in the production of canopy fresh weight. This research can be concluded that 3 hours was sufficient to give the good results to improve the results of lettuce plants production. Keywords : Lettuce Production, AB Mix Nutrition, Red and Blue LED.

scholarly journals Pengaruh Dosis Pupuk Kandang Ayam terhadap Pertumbuhan dan Hasil Tiga Macam Varietas Selada (Lactuca sativa L.)

2021 ◽  
Vol 8 (1) ◽  
pp. 10-18
Author(s):  
Dwi Ismawati ◽  
Tri Rahayu ◽  
Srie Juli Rachmawatie
Keyword(s):  
Lactuca Sativa ◽  
Chicken Manure ◽  
Growth And Yield ◽  
Fresh Weight ◽  
Treatment Combination ◽  
Factorial Method ◽  
Lactuca Sativa L ◽  
Randomized Design ◽  
Affected Plant ◽  
Grand Rapids

The study aims to determine the influence of chicken manure dose on growth and yield on three kinds of lettuce (Lactuca sativa, L.) planted in a polybag. This research was conducted from November 2019 until January 2020, in Gerdu Village, Karangpandan District, Karanganyar Regency, between 450 - 650 m above sea level. The research used a factorial method with a Completely Randomized Design (CRD) consist of two treatment factors. The first factor is dose of chicken manure consisting of 3 levels (D1 = 62.5 g/ polybag, D2 = 125 g / polybag, D3 = 187.5 g/ polybag). The second factor was varieties of lettuce (V) consist of 3 types (V1 = Grand Rapids Variety, V2 = Kriebo Variety, V3 = Bisi SL 02 Variety). Analysis of variance was used to analyzed the data, with the F test at 5% and 1% levels and then followed by Duncan's multiple range test at 5% level. The results showed that chicken manure dosage significantly affects fresh weight and consumption weight per plant. The best dose of chicken manure for the treatment is 125 g / polybag. The varieties significantly affected plant height, fresh weight, and consumption weight and significantly affected leaf width per plant. The interaction between the dose of chicken manure and varieties of lettuce (DxV) showed the best results on the combination 125 g / polybag chicken manure dose with the Kriebo variety (D2V2). This treatment combination gives the highest consumption weight, which is 76.52 g. While the treatment combination of 62.5 g / polybag chicken manure dose and Bisi SL 02 variety (D1V3) had the lowest consumption weight (39.68 g).

Gibberellic acid induced elongation of lettuce hypocotyls and its inhibition by colchicine

1974 ◽  
Vol 52 (1) ◽  
pp. 259-264 ◽  
Author(s):  
V. K. Sawhney ◽  
L. M. Srivastava
Keyword(s):  
Gibberellic Acid ◽  
Lactuca Sativa ◽  
Kinetic Data ◽  
Maximum Elongation ◽  
Short Term ◽  
Ultrastructural Studies ◽  
Lactuca Sativa L ◽  
Hypocotyl Development

Lettuce (Lactuca sativa L.) seedlings treated with gibberellic acid (GA) for 72 h produced hypocotyls 600% longer than the water controls. The process of elongation was accelerated by GA. Also, for maximum elongation, presence of GA was not necessary after 20 h. Short term treatments of seedlings with GA indicated that the seedlings were most 'sensitive' to GA after 8 h of growth in water. Colchicine inhibited the GA-induced elongation. Its effect was maximal if it was applied within the first 2 h after GA treatment irrespective of the stage of hypocotyl development; the inhibition was progressively lessened after 2 h and lost after 36 h. These kinetic data are presented together with measurements of hypocotyl cell lengths and widths and provide a basis for correlated ultrastructural studies.

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).

scholarly journals The Effect of NPK Doses and Plant Spacing on Lettuce (Lactuca sativa L.) Growth and Production

2020 ◽  
Vol 5 (2) ◽  
pp. 102-106
Author(s):  
R. Rahmawati
Keyword(s):  
Lactuca Sativa ◽  
Block Design ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Lettuce Growth ◽  
The Impact

The aim of this study was to determine the impact of NPK doses and proper plant spacing in lettuce growth and production. The experiment was conducted in Wirimpalennae Village, Tempe Subdistrict, Wajo Regency from January to March 2017. The experiment employed randomized block design with 2 factor factorial namely NPK doses (300 kg/ha, 350 kg/ha, 400 kg/ha and plant spacing (20 x 25 cm, 25 x 25 cm, 25 x 40 cm). The result showed that the interaction between NPK doses and plant spacing were significantly influenced the fresh weight of lettuce. The highest yield of lettuce was 2,16 kg/Ha (12 t/Ha) produced by the combination of NPK dose (350 kg/ha) and plant spacing (25 x 25). The interaction of NPK dose and plant spacing treatments were not significantly influenced others parameters

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