Morphological and productive aspects of lettuce in low altitude and latitude

Cardoso, Sara Santos; Guimarães, Marcelo de Almeida; Neto, Hozano de Souza Lemos; Tello, Jean Paulo de Jesus; DoVale, Júlio César

doi:10.5935/1806-6690.20180073

Cited by 4 publications

(6 citation statements)

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“…Green oakleaf lettuce had lower contents, around 50% lower than purple oakleaf lettuce, however, its fresh mass production was higher; so the types of lettuce with higher chlorophyll content tend to have lower mass production. Corroborating this study, Cardoso et al (2018) evaluated crispleaf, iceberg and butterhead types of lettuce in a protected environment, and verified that the iceberg lettuce showed the highest chlorophyll content; however, this lettuce was not the one which showed the highest mass production. No linear correlations were observed among plants containing different chlorophyll contents and fresh and dry mass of lettuce genotypes cultivated under hydroponic system.…”

Section: Genotypesmentioning

confidence: 53%

“…Rosa et al (2014), evaluating the green and purple mimosa lettuce hydroponically cultivated, verified that the green mimosa lettuce showed lower chlorophyll contents, its fresh mass production was higher, though. Cardoso et al (2018), evaluating lettuce cultivars in protected environment, verified that the head lettuce showed higher chlorophyll content, it was not the cultivar which showed the highest mass production, though. However, there are limited studies associated to the content of chlorophylls in lettuce leaves with their mass productivity, which could be used for breeders in the selection and development of more efficient plants.…”

Section: Resumo Avaliação Morfológica De Genótipos De Alface Em Sistema Hidropônicomentioning

confidence: 98%

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Morphological evaluation of lettuce genotypes grown under hydroponic system

et al. 2021

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Crispleaf lettuce, which is a light green leaf lettuce, is the most popular leafy vegetable in Brazil. However, it is relevant to evaluate agronomic traits of lettuce with more intense green color leaves considering the increase in consumer demand. Thus, the aim of this study was to evaluate lettuce genotypes about the different chlorophyll contents and correlate with green mass production in a hydroponic system. Ten lettuce inbred lines and two cultivars (Vanda and Luiza) were evaluated for agronomic traits and chlorophyll contents in leaves. A randomized block design with four replicates was used. The chlorophyll content was variable among the genotypes, ranging from 43.3 (Luiza) to 20.8 (Vanda). The genotypes with the highest chlorophyll content were those who showed the lowest mass production, but no correlations were found between these variables, though.

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Section: Genotypesmentioning

confidence: 53%

Section: Resumo Avaliação Morfológica De Genótipos De Alface Em Sistema Hidropônicomentioning

confidence: 98%

Morphological evaluation of lettuce genotypes grown under hydroponic system

et al. 2021

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“…On the other hand, the average yield performance of Rsk-3 was better at Holeta (24.37 t ha -1 ) than at Debrezeit (15.27 t ha -1 ) (Table 5). Lettuce is considered a crop of mild climate and its production in regions of low altitude is impaired due to the high temperatures and the predominance of long days (Cardoso et al, 2018). Using the results of the present study, it is possible to suggest that the different varieties respond differently to different agro-ecologies, depending on their adaptation.…”

Section: Figurementioning

confidence: 82%

Effect of planting density on yield and yield components of lettuce (Lactuca sativa L.) at two agro-ecologies of Ethiopia

Mengistu¹,

Tabor²,

Dagne³

et al. 2021

Afr. J. Agric. Res.

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Use of optimum plant spacing (planting density) is one of the important agronomic practices to maximize the productivity of lettuce. A field experiment was conducted to assess the responses of two lettuce varieties to different plant spacing at Debrezeit and Holeta Agricultural Research Centers representing two different agro-ecologies in Ethiopia. Nine treatment combinations of three levels of inter-row and three levels of intra-row spacing were studied on two types of lettuce varieties. The treatments were arranged in a randomized complete block design (RCBD) with three replications in a factorial experiment. The results revealed that marketable and total fresh leaf yield, and fresh leaf weight per plant were significantly affected by the main effect of plant spacing and variety as well as its interaction (p<0.05). Increasing planting density increased the total fresh leaf yield per unit area in both varieties, however reduced the fresh leaf weight per plant. The highest fresh leaf yield was obtained using 40 cm x 20 cm (125000 plants ha -1 ) planting density from variety Great Lakes, while variety Rsk-3 recorded its highest fresh leaf yield at the highest planting density of 30 cm x 20 cm (166667 plants ha -1 ). Great Lakes was superior over Rsk-3 in most yield parameters studied though Rsk-3 was better in leaf dry weight percent. Besides, both varieties responded differently in both sites while Great Lakes performed better at Debrezeit than at Holeta and Rsk-3 did well at Holeta than at Debrezeit. Hence, 40 cm x 20 cm and 30 cm x 20 cm could be used as the optimum plant spacing to grow Great Lakes and Rsk-3 respectively in the respective agro-ecologies.

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“…Verifica-se na Figura 3 o conteúdo dos teores de Chl a em função das soluções nutritivas S1 = 1,9; S2 = 2,4; S3 = 2,9; S4 = 3,4; S5 = 3,9; S6 = 4,4 e S7 = 4,9 dS m -1 e das cultivares Elba, Cristina e Veneranda ao final do experimento, observa-se que as maiores médias encontradas foram nos tratamentos C1S2 (Elba/S2 = 2,4 dS m -1 ) e C1S3 (Elba/S3 = 3,9 dS m -1 ), apresentando os valores de 57 e 54 mg/g -1 na massa fresca da folha (MF). Comparando os teores de clorofila encontrados nesta pesquisa com os de Cardoso et al (2018) que trabalharam com as cultivares dos grupos comerciais Lisa Repolhuda e Crespa Solta e observaram que o grupo Crespa Repolhuda apresentou teores de Chl a com média de 6,58 mg/g -1 este resultado é inferior aos desta pesquisa.…”

Section: Resultsunclassified

“…Provavelmente esse valor inferior de Chl b encontrados pelos autores foi devido à utilização de solução nutritiva preparada com água residuária do reator UASB (Upflow Anaerobic Sludge Blanket) que possivelmente quantidade de macro e micronutrientes existente nesta agua não favoreceu o desenvolvimento das plantas. Cardoso et al (2018) Research, Society and Development, v. 10, n. 3, e10510313011, 2021 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v10i3.13011 dos grupos comerciais Lisa Repolhuda e Crespa Solta e observaram que o grupo Crespa Repolhuda apresentou teores Chl b com média de 5,86 mg/g -1 esses resultados são distintos aos desta pesquisa.…”

Section: Resultsunclassified

Ácido ascórbico e pigmentos fotossintéticos na alface crespa cultivada em sistema hidropônico com soluções salinas

Xavier

Azevedo

et al. 2021

RSD

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O objetivo desta pesquisa foi determinar os teores de clorofila e vitamina-C nas cultivares da alface (Elba, Cristina e Veneranda) cultivadas em sistema hidropônico com soluções nutritivas apresentando diferentes níveis de salinidade. O experimento foi conduzido na Universidade Estadual da Paraíba,UEPB Campus-II, zona rural da cidade de Lagoa Seca-PB, via técnica Fluxo Laminar de Nutrientes-NFT em ambiente protegido. O delineamento experimental foi em blocos casualizados, em esquema de parcelas subdivididas, as parcelas constituídas por sete soluções nutritivas preparadas a partir da metodologia de Furlani de modo que a solução S1 apresentou Condutividade Elétrica-CE (1,9 dS m-1) e as demais soluções os seguintes valores de CE: S2-2,4; S3-2,9; S4-3,4; S5-3,9; S6-4,4 e S7-4,9 dS m-1, com três repetições. As subparcelas foram compostas pelas cultivares Elba, Cristina e Veneranda. As variáveis analisadas foram: teores de clorofila (Chl a e b) total, carotenoides e vitamina-C. As soluções nutritivas apresentaram comportamento linear para todos os tratamentos não deferindo estaticamente entre si. O maior valor para clorofila total foi obtido na cultivar Veneranda. Para as variáveis (Chl b e total) os maiores teores encontrados foi na cultivar Veneranda, cujos valores foram de 35,97 e 52,06 mg/g-1 respectivamente. O tratamento Elba/S3=3,4 dS m-1 proporcionou o maior teor de carotenoides média de 57 mg/g-1, ainda a cultivar Elba apresentou os maiores teores (Chl a) com as soluções nutritivas S2=2,4 e S3=3,9 dS m-1. A cultivar Veneranda promoveu os maiores teores para (Chl b e total). Os maiores teores de vitamina-C foram encontrados nas cultivares Cristina e Veneranda.

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Morphological and productive aspects of lettuce in low altitude and latitude

Cited by 4 publications

References 0 publications

Morphological evaluation of lettuce genotypes grown under hydroponic system

Morphological evaluation of lettuce genotypes grown under hydroponic system

Effect of planting density on yield and yield components of lettuce (Lactuca sativa L.) at two agro-ecologies of Ethiopia

Ácido ascórbico e pigmentos fotossintéticos na alface crespa cultivada em sistema hidropônico com soluções salinas

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