Qualidade pós-colheita da alface hidropônica em ambiente protegido sob malhas termorefletoras e negra

Morais, Patrícia Lígia Dantas de; Dias, Nildo da Silva; Almeida, Maria Mozarina Beserra; Sarmento, José Darcio Abrantes; Neto, Osvaldo Nogueira de Sousa

doi:10.1590/s0034-737x2011000500015

Cited by 12 publications

(12 citation statements)

References 13 publications

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“…For Loose-leaf group (Table 2), when the cultivation was carried out in summer, no statistical differences were found among cultivars, but in autumn and spring, Regiane presented higher performances than Elisa, and in winter, Elisa was the cultivar that stood out. Titratable acidity values shown in Table 2 were higher than those found by Morais et al (2011) and Santos et al (2010), who evaluated cultivars of Green-leaf group in Mossoró, Rio Grande do Norte state and in Botucatu, São Paulo state, respectively, in different farming systems, and found that titratable acidity varies according to the cultivar and the cultivation environment.…”

Section: Resultscontrasting

confidence: 54%

Qualitative performance of lettuce cultivars in four seasons in Mossoró, Rio Grande do Norte State, Brazil

et al. 2016

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RESUMOThe major challenge in producing good quality lettuce in the semiarid region is the climatic factors such as high temperature, high luminosity and low air relative humidity, which affect the quality characteristics of leafy vegetables. Thus, the objective of this study was to evaluate the quality of lettuce cultivars of Crisphead (Angelina, Amelia and Taina), Mimosa (Mila, Mimosa and Lavinia), Green-leaf (Scarlet, Vera, Isabella and Vanda) and Loose-leaf (Elisa and Regiane) in four seasons: summer (12/21/2012), autumn (3/21/2013), winter (06/21/2013) and spring (09/23/2013) in the conditions of Mossoró, Rio Grande do Norte state. The experimental design was a complete randomized block with four replications. The following characteristics were quantified: pH, titratable acidity, soluble solids (SS) and total soluble sugars. The quality of the lettuce was influenced by the cultivar and environmental conditions. Lower titratable acidity was recorded for Green-leaf and Loose-leaf groups in the summer and for Crisphead groups in the autumn. The highest content of soluble solids were achieved in autumn for cultivars Vera, Vanda, Isabela, Elisa and Regiane; to Lavinia, Angelina, Amelia and Tainá, and summer and autumn stood out from the other growing seasons for this trait. Cultivars Scarlet, Angelina and Amelia had higher levels of total soluble sugars in the summer; Mila and Lavinia in spring; Elisa and Regiane in winter and Tainá in spring.Key words: Lactuca sativa L.; quality; climatic factors. Otaciana Maria dos Prazeres da Desempenho qualitativo de cultivares de alface em quatro épocas do ano em Mossoró, Rio Grande do NorteA grande dificuldade para a produção de alface de qualidade na região semiárida se deve aos fatores climáticos, como temperatura elevada, alta luminosidade e baixa umidade relativa do ar, que afetam as características de qualidade das hortaliças folhosas. Diante disso, o objetivo da pesquisa foi avaliar a qualidade de cultivares de alface dos grupos Americana (Angelina, Amélia e Tainá), Mimosa (Mila, Mimosa e Lavínia), Crespa (Scarlet, Vera, Isabella e Vanda) e Lisa (Elisa e Regiane) em quatro épocas do ano: verão (21/12/2012), outono (21/03/2013), inverno (21/06/2013) e primavera (23/09/2013) nas condições de Mossoró, RN. O delineamento experimental adotado foi o de blocos casualizados completos com quatro repetições. Foram quantificadas as características: pH, acidez titulável, sólidos solúveis (SS) e açúcares solúveis totais. A qualidade da alface foi influenciada pela cultivar e condições ambientais. Os grupos Crespa e Lisa registraram menor acidez titulável no verão e as Americanas no outono. Os maiores teores de SS foram obtidos no outono para as cultivares Vera, Vanda, Isabela, Elisa e Regiane; para Lavínia, Angelina, Amélia e Tainá, o verão e outono se destacaram das demais épocas de cultivo, para esta característica. As cultivares Scarlet, Angelina e Amélia apresentaram maior teor de açúcares solúveis totais no verão, Mila e Lavínia na primavera, Elisa e Regiane no inve...

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Section: Resultscontrasting

confidence: 54%

Qualitative performance of lettuce cultivars in four seasons in Mossoró, Rio Grande do Norte State, Brazil

et al. 2016

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“…In relation to the vitamin C content, the Tabela Brasileira de Composição dos Alimentos (2011) informs that 100 g of fresh curly lettuce has 15.5 mg of vitamin C. Kim et al (2016), reported 2.9 mg.g-1 of vitamin C in crisphead lettuce (Lactuca sativa L.), while for baby Romaine they obtained values between 21 and 40 mg.g-1. Morais et al (2011) observed a vitamin C content of 27.24 mg.100g-1 in lettuce on the day of harvest (similar to the values obtained for treatments 1, 3, 5, 6, 7 and 8). Table 2 shows that during the 14 days of refrigerated storage, for all treatments, a mass reduction (p < 0.05) occurred in the lettuce samples, and from day 5 the decrease in this parameter is higher for all treatments.…”

Section: Resultssupporting

confidence: 85%

Influence of refrigeration system parameters during storage of Lactuca Sativa l under non-isothermal conditions

Schmitz

Hoffmann

Angioletti

et al. 2020

BJD

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Lettuce (Lactuca sativa L.) is a leaf vegetable rich in vitamins, minerals, fiber and bioactive compounds. Its preservation after harvest usually occurs under refrigeration, slowing the chemical and microbiological reactions. The objective of this study was to verify the influence of the refrigeration parameters (set temperature and oscillation range) on the preservation of hydroponic crispy lettuce (Lactuca sativa L.), variety Solaris, in terms of weight loss and moisture, vitamin C and total chlorophyll contents. Samples were analyzed during 14 days of storage packed in expanded polystyrene (EPS) packaging wrapped with polyvinyl chloride (PVC). Different conditions of set temperature (2 °C, 6 °C and 10 °C) and oscillation range (±1 °C, ±3 °C and ±5 °C) were tested, using a 3² experimental design. The analysis revealed losses in the mass and moisture content after 14 days, with the greatest reductions being observed for the treatments with a set temperature of 10 °C and all oscillation ranges (±1 °C, ±3 °C and ±5 °C). However, the vitamin C and total chlorophyll contents showed variations during storage for all treatments studied. Based on the results of this study, it was concluded that applying a low temperature (2 °C), with all 3 oscillation ranges studied, can prolong the lettuce shelf life.

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“…In this sense, shade screens have been used alone or in combination in protected environments, making the resulting microclimatic conditions appropriate for crop growth. Thus, the harmful effects of high incidence of solar radiation are reduced, also protecting against extreme temperatures (Morais et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Plant biometric characterization and leaf micromorphometry of Talinum triangulare (Jacq.) Willd cultivated under shade

et al. 2018

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Talinum triangulare (Jacq.) Willd, known as Ceylon spinach, Surinam purslane, or waterleaf, is cultivated for medicinal and food purposes. Among environmental factors, light is an important regulator of primary production, contributing to plant growth. However, the success of each plant species depends on its morphoanatomical responses to light. The aim of this study was to determine whether T. triangulare leaf micromorphometry is affected when grown in full sun and under shade, and if so, which plant biometric variables are affected. T. triangulare cultivation was tested in beds arranged in blocks under shade levels of 0, 18, 30, and 50%. Each bed was considered a basic experimental unit, totaling four replications per treatment. Plant height, stem diameter, leaf area, leaf fresh weight, stem fresh weight, specific leaf area, leaf area ratio, abaxial epidermis, and mesophyll thickness were higher as shade levels increased. However, there was a decrease in the number of leaves, root to shoot ratio, stomatal density on abaxial and adaxial surfaces, and palisade parenchyma thickness. Nevertheless, root length, leaf and stem dry weights, leaf weight ratio, adaxial stomatal index, adaxial epidermis, and spongy parenchyma thickness remained constant. Plants responded differently to shade, with morphological and anatomical changes, suggesting a phenotypic plasticity and raising the possibility of being grown both in shaded environments and in full sunlight.

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Qualidade pós-colheita da alface hidropônica em ambiente protegido sob malhas termorefletoras e negra

Cited by 12 publications

References 13 publications

Qualitative performance of lettuce cultivars in four seasons in Mossoró, Rio Grande do Norte State, Brazil

Qualitative performance of lettuce cultivars in four seasons in Mossoró, Rio Grande do Norte State, Brazil

Influence of refrigeration system parameters during storage of Lactuca Sativa l under non-isothermal conditions

Plant biometric characterization and leaf micromorphometry of Talinum triangulare (Jacq.) Willd cultivated under shade

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