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EFFECTIVENESS OF POSTHARVEST SOLUTIONS FOR THE CONSERVATION OF CUT Oncidium varicosum (ORCHIDACEAE) INFLORESCENCES Ciência e Agrotecnologia
Mattiuz,Claudia Fabrino Machado; Mattiuz,Ben-Hur; Rodrigues,Teresinha de Jesus Deléo; Marques,Kelly Magalhães; Martins,Ramilo Nogueira.
The orchid Oncidium varicosum is a tropical plant with significant commercial value due to the beauty of its yellow inflorescences. Several authors have observed a reduction in the water content of cut flowers, consequently, wilting and senescence of petals are the main reasons for the termination of the decorative life of cut flowers. In this research, we studied the effects of several chemical compounds on the postharvest life of cut inflorescences of Oncidium varicosum 'Samurai'. These chemicals are as follows: sucrose (5%) plus 8-hidroxiquinoline citrate (8-HQC) (100 mg L-1) plus silver nitrate (AgNO3) (50 mg L-1); sucrose (5%) plus citric acid (75 mg L-1); quaternary ammonia at 30% (50 mg L-1); and sucrose (5%) plus quaternary ammonia at 30% (50 mg...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physiology; Orchids; Flowers; Carbohydrates; Carotenoids; Relative water content.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000400315
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Evaluation of hydration indexes in kale leaves Braz. J. Plant Physiol.
Calbo,Adonai G.; Ferreira,Marcos D..
Hydration indexes are practical variables for quantifying plant water stress and can be useful for agronomic purposes. Three adapted hydration indexes based on relative water content, volumetric hydration, and leaf turgor pressure were evaluated in kale (Brassica oleracea var. acephala) leaf segments. Relative water content and volumetric hydration were measured in leaf segments after a water infiltration procedure with the aim of filling its large intercellular volumes (@18%v/v). The infiltration was done using a hydrostatic weighing procedure and with the aid of vacuum to fully hydrate the leaf segments. These two relative indexes were proportional to the transpiration-induced leaf water loss. The third index, turgor pressure, was measured with a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brassica oleracea; Intercellular air volume; Volumetric hydration; Relative water content; Turgor pressure; Leaf volumetric elastic modules; Wiltmeter.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000200006
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Growth evaluation and water relations of Erythrina velutina seedlings in response to drought stress Braz. J. Plant Physiol.
Silva,Elizamar Ciríaco da; Silva,Marcos F. A.; Nogueira,Rejane J. M. C.; Albuquerque,Manoel B..
Erythrina velutina Willd. (common name: mulungu) is a deciduous, heliophyte found in the semi-arid region of northeastern Brazil. To evaluate the growth and water relations of mulungu seedlings in soils with different degrees of moisture content, an experiment was carried out under greenhouse conditions using four water treatments (100%, 75%, 50% and 25% of the field capacity- FC). Predawn (Ψpdw) and midday leaf water potential (Ψmdw), relative water content (RWC), plant height, number of leaves, stem diameter, leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), dry matter in different organs, biomass partitioning and root:shoot ratio were evaluated. No differences were detected between treatments for Ψpdw after 30 days; however, at midday,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass allocation; Dry matter; Leaf area; Root to shoot ratio; Relative water content; Water potential.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400002
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Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability Braz. J. Plant Physiol.
Beltrano,José; Ronco,Marta G..
The aim of this paper was to investigate the contribution of the arbuscular mycorrhizal fungus Glomus claroideum to drought stress tolerance in wheat plants grown under controlled conditions in a growth chamber, and subjected to moderate or severe water stress and rewatering. Water stress tolerance was determined through total dry weight, leaf relative water content, leakage of solutes and leaf chlorophyll and protein concentrations in mycorrhizal and non-mycorrhizal wheat plants. Total dry weight and leaf chlorophyll concentrations were significantly higher in mycorrhizal plants after moderate or severe water stress treatments compared with non-mycorrhizal ones. Electrolyte leakage was significantly lower in water-stressed inoculated plants. Compared to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mycorrhizae; Relative water content; Rewatering; Solute leakage; Water deficit.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100004
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Physiological parameters in sugarcane cultivars submitted to water deficit Braz. J. Plant Physiol.
Graça,José Perez da; Rodrigues,Fabiana Aparecida; Farias,José Renato Bouças; Oliveira,Maria Cristina Neves de; Hoffmann-Campo,Clara Beatriz; Zingaretti,Sonia Marli.
To investigate the processes involved in the susceptibility of sugarcane plants to water deficit, several physiological parameters were evaluated in drought tolerant (SP83-2847 and CTC15) and sensitive (SP86-155) cultivars. The water deficit affected the photosynthetic apparatus of all the plants in different ways, within and among cultivars. The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit. In control plants of the tolerant cultivars (SP83-2847 and CTC15) the photosynthetic rate was higher than in the sensitive cultivar (SP86-155). Cultivar CTC15 showed the highest relative water content during the dry period. The quantum efficiency photosystem II of cultivar SP83-2847 was more stable in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthetic efficiency; Relative water content; Saccharum; Water stress; Drought.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300006
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Relacoes hidricas em dois hibridos de milho sob dois ciclos de deficiencia hidrica. Repositório Alice
PIMENTEL, C..
Neste trabalho foram estudadas as relacoes hidricas de dois hibridos de milho (Zea mays L.), em casa de vegetacao: o IAC 8222 (hibrido com tolerancia ambiental) e o DINA 10 (hibrido comum); submetidos a um ou a dois ciclos de estresse, aos 30 e 46 DAP. O IAC 8222 manteve o potencial hidrico de folha (hf) superior ao do DINA no primeiro ciclo de estresse e no segundo ciclo, em plantas que sofreram os dois ciclos (com endurecimento), no sexto e ultimo dia de deficiencia hidrica, nao havendo diferencas em relacao ao conteudo hidrico relativo (CHR) entre os hidricos. Houve um aumento da concentracao de acucares soluveis e de aminoacidos com a deficiencia hidrica, sem diferencas entre os hibridos no primeiro ciclo de deficit hidrico, e com aumento significativo...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Potencial hidrico de folha; Conteudo hidrico relativo; Leaf water potential; Relative water content.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/101076
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Temperature and modified atmosphere affect the quality of okra Scientia Agricola
Finger,Fernando Luiz; Della-Justina,Maria Edith; Casali,Vicente Wagner Dias; Puiatti,Mário.
Little information is available on the influence of temperature on plastic films wrapped okra (Albelmoschus esculentus) for their postharvested conservation. This works investigated the influence of the temperature and PVC film on the development of chilling injury and storability from one of the most popular Brazilian cultivar of okra cv. Amarelinho in fruits stored at 5, 10ºC and at 25ºC. Fruits were harvest at commercial maturity stage with length ranging from 8 to 12 cm, and immediately wrapped in PVC over a polystyrene tray and than stored until visible deterioration or wilting symptoms. Lowering the temperature of storage room from 25 to 10 or 5ºC decreased the weight loss in both PVC wrapped and control fruits, with a lower rate at 5ºC. By reducing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Albelmoschus esculentus; Chilling injury; PVC film; Relative water content; Chlorophyll.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400006
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Traits for Screening and Selection of Cowpea Genotypes for Drought Tolerance at Early Stages of Breeding JARTS
Kumar, Ashok; Sharma, K. D.; Kumar, D..
The association of leaf water content with yield-attributes such as pod setting and number of pods/plant and seed yield in cowpea was examined using midday drop of leaf relative water content (RWC) determined from morning (800 h) and midday (1330 h) measurements of RWC. Midday drop of RWC was significantly correlated to pod setting ratio (R2 = 0.80, P < 0.01), number of pods/plant (R2 = 0.87, P < 0.01) and seed yield (R2 = 0.37, P < 0.05). There was a significant genotypic variation for leaf water potential (LWP) at 800 and 1330 h and for RWC at 1330 h. Significant genotypic differences were also observed in pod setting ratio, number of pods/plant, number of seeds/pod, 1000-seed weight, biomass and seed yield. Pod setting ratio was significantly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agronomy and Crop Science; Plant Science cowpea; Drought; Pod setting; Relative water content; Screening trait; Vigna unguiculata L. Walp..
Ano: 2008 URL: http://www.jarts.info/index.php/jarts/article/view/69
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Use of physiological parameters as fast tools to screen for drought tolerance in sugarcane Braz. J. Plant Physiol.
Silva,Marcelo de A.; Jifon,John L.; Silva,Jorge A.G. da; Sharma,Vivek.
Drought is one of the major limitations to plant productivity worldwide. Identifying suitable screening tools and quantifiable traits would facilitate the crop improvement process for drought tolerance. In the present study, we evaluated the ability of four relatively physiological parameters (variable-to-maximum chlorophyll a fluorescence ratio, F v/F m; estimated leaf chlorophyll content via SPAD index; leaf temperature, LT; and, leaf relative water content, RWC) to distinguish between drought tolerant and susceptible sugarcane genotypes subjected to a 90-d drought cycle. Eight field-grown genotypes were studied. By 45 d after the onset of treatments, the F v/F m, SPAD index and RWC of drought-stressed plants had declined significantly in all genotypes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a fluorescence; Relative water content; Leaf temperature; Saccharum; Water deficit.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000300003
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Uso da radiação solar pelo milho sob diferentes preparos do solo, espaçamento e disponibilidade hídrica Repositório Alice
KUNZ, J.H.; BERGONCI, J.I.; BERGAMASCHI, H.; DALMAGO, G.A.; HECKLER, B.M.M.; COMIRAN, F..
O objetivo deste trabalho foi avaliar a eficiência de interceptação e de uso da radiação fotossinteticamente ativa (RFA) pela cultura do milho em diferentes sistemas de manejo do solo, arranjos de plantas e disponibilidade hídrica. O milho foi cultivado em plantio direto e preparo convencional, na combinação com duas disponibilidades hídricas (irrigado e sequeiro) e espaçamentos de 40 e 80 cm entre fileiras de plantas. Em cada tratamento, foram instalados sensores para medida da RFA transmitida pela cultura, na superfície do solo, ao passo que a RFA incidente foi medida acima da cultura. A redução da distância entre fileiras aumentou a eficiência de interceptação em todos os tratamentos. Sob plantio direto, a cultura apresentou maior eficiência de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Deficit hídrico; Conteúdo relativo de água; Sistema plantio direto; Manejo do solo; Water deficit; Relative water content; No-tillage; Soil management.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122819
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Vase life and rehydration capacity of dry-stored gladiolus flowers at low temperature Ciência Rural
Costa,Lucas Cavalcante da; Araújo,Fernanda Ferreira de; Santos,Mirelle Nayana de Sousa; Lima,Paula Cristina Carvalho; Pereira,Ariana Mota; Finger,Fernando Luiz.
ABSTRACT: Normally, it is not recommended the conditioning of gladiolus stems in water during storage or transport. Hydration of petals may accelerate flower opening, even at a low temperature, which compromises quality at marketing moment. However, for this species, neither the effect of prolonged dry cold storage nor its behavior when transferred to water at room temperature has been evaluated. The present study aimed to evaluate the vase life and the rehydration capacity of gladiolus flowers ( Gladiolus grandiflora Hort.) after dry storage at low temperature. Flower stems of cultivars Blue Frost, Gold Field, Traderhorn, and Jester were dry-stored at a temperature of 5 ± 1 ºC and relative humidity of 85% for 12, 24, 36, and 48h. Control stems remained...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gladiolus grandiflora (Hort.); Dry storage; Cold storage; Vase life; Relative water content.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200406
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Vida útil e metabolismo de carboidratos em raízes de mandioquinha-salsa sob refrigeração e filme de PVC. Repositório Alice
RIBEIRO, R.A.; FINGER, F. L.; PUIATTI, M.; CASALI, V.W.D..
O objetivo deste trabalho foi avaliar a influência da temperatura de armazenamento e do uso do filme de cloreto de polivinila (PVC) sobre a perda de matéria fresca e água, incidência de danos causados por frio e metabolismo pós-colheita dos carboidratos, em raízes tuberosas de mandioquinha-salsa (Arracacia xanthorrhiza). O filme de PVC reduziu a perda de matéria fresca e manteve o teor de água das raízes, durante o armazenamento por 60 dias a 5 e 10oC. Os danos causados por frio foram inibidos nas raízes embaladas em filme de PCV, em ambas as temperaturas de armazenamento. As baixas temperaturas induziram o acúmulo de açúcares solúveis e a degradação de amido e, para as raízes armazenadas sem PVC, o aumento do conteúdo dos açúcares solúveis foi transiente...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Arracacia xanthorrhiza; Temperatura; Atmosfera modificada; Teor relativo de água; Temperature; Modified atmosphere; Relative water content.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/126110
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