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Portable chlorophyll meter for the quantification of photosynthetic pigments, nitrogen and the possible use for assessment of the photochemical process in Carica papaya L. 61
Torres Netto,Alena; Campostrini,Eliemar; Oliveira,Jurandi Gonçalves de; Yamanishi,Osvaldo Kiyoshi.
The techniques utilized to extract chlorophyll from plant materials are destructive and based on methods that use organic solvents. This study proposes the non-destructive quantification of chlorophyll and nitrogen concentration using a portable chlorophyll meter (SPAD-502). Further, was possible to establish relationships between chlorophyll fluorescence and SPAD-502 values. This methodology could save time, space and resources, and could be used for analysis of the photosynthetic processes. Papaya leaves (Solo and Formosa groups) of different ages were collected from 15-month-old plants cultivated in a commercial field in São Francisco de Itabapoana, Rio de Janeiro State (41(0):15W; 21(0):27S). Correlations were established between the chlorophyll...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nutrient content; Photosynthetic pigments; SPAD-502.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000300004
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Morphological analysis and photosynthetic performance of improved papaya genotypes 61
Torres Netto,Alena; Campostrini,Eliemar; Azevedo,Letícia C.; Souza,Marcelo A.; Ramalho,José C.; Chaves,Manuela M..
Brazil is the largest world producer of papaya and the third largest exporter despite of only 1.5 to 2.0% of its production is exported. Such an underexplored exportation potential highlight the necessity for physiological studies on new cultivars and hybrids to verify their agronomic and commercial viability. Two Brazilian states, Bahia and Espirito Santo, are responsible for 80% of national production. Papaya can also be an agricultural alternative to north / northeast of Rio de Janeiro, because the region is close to consumer centers and have similar environmental conditions of the most productive regions. Nevertheless, it is worth to develop cultivars that can express the highest yield potential in this region. The aim of this work was to characterize...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya L.; Fluorescence; Gas exchange; Genotypes; Growth analyses.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300005
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Relationship between photochemical efficiency (JIP-Test Parameters) and portable chlorophyll meter readings in papaya plants 61
Castro,Fernanda Assumpção; Campostrini,Eliemar; Torres Netto,Alena; Viana,Leandro Hespanhol.
The Portable Chlorophyll Meter (PCM) is used to estimate the total chlorophyll and leaf nitrogen content of various species. Since there is a relationship between the chlorophyll concentration and the photochemical efficiency, a relationship can also be established between the PCM readings and some fluorescence variables to provide information on photosystem II (PSII) structure and activity. Papaya (Carica papaya L.) plants ['Sunrise Solo' (leaves with intense green coloring) and 'Golden' cultivars (leaves with yellow-green coloring) were grown in a greenhouse with 30% interception of photosynthetically active photon flux density. The plants were cultivated in 15L plastics pots. Ninety to 100 days after planting the older leaves turned yellow and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya; L. fluorescence JIP-Test Chlorophyll.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400007
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Mancha fisiológica do mamão 'formosa': relações com o potencial hídrico do solo, o teor de sólidos solúveis totais do látex e as variáveis do clima 64
Reis,Fabrício de Oliveira; Campostrini,Eliemar; Torres Netto,Alena.
Em várias regiões produtoras de mamão do Brasil, tem sido observado um distúrbio fisiológico nos frutos denominado de Mancha Fisiológica do Mamão (MFM). Tal distúrbio pode causar significativos prejuízos ao produtor, uma vez que pode comprometer a qualidade do fruto da espécie. Procurou-se buscar, neste trabalho, possíveis relações entre a incidência da MFM, o potencial hídrico do solo, o teor de sólidos solúveis no látex, a amplitude térmica e o déficit de pressão de vapor do ar. Para tanto, num plantio comercial localizado na cidade de São Francisco do Itabapoana - RJ, foram monitorados o déficit de pressão de vapor do ar, o potencial hídrico do solo, o teor de sólidos solúveis no látex dos frutos em duas faces do fruto (face próxima ao tronco e face...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya L.; Distúrbio fisiológico; Sazonalidade.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542008000500018
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Papaya pulp gelling: is it premature ripening or problems of water accumulation in the apoplast? 94
Oliveira,Jurandi Gonçalves de; Bressan-Smith,Ricardo Enrique; Campostrini,Eliemar; Cunha,Maura Da; Costa,Ernani Santos; Torres Netto,Alena; Coutinho,Kelly da Silva; SILVA,Marcelo Gomes da; Vitória,Angela Pierre.
Gelled aspect in papaya fruit is typically confused with premature ripening. This research reports the characterization of this physiological disorder in the pulp of papaya fruit by measuring electrolyte leakage, Pi content, lipid peroxidation, pulp firmness, mineral contents (Ca, Mg and K - in pulp and seed tissues), and histological analysis of pulp tissue. The results showed that the gelled aspect of the papaya fruit pulp is not associated with tissue premature ripening. Data indicate a reduction of the vacuole water intake as the principal cause of the loss of cellular turgor; while the waterlogged aspect of the tissue may be due to water accumulation in the apoplast.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ultrastructural alterations; Cell turgor; Fruit quality; Physiological disturbances; Biochemical alterations.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452010000400003
Registros recuperados: 5
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