Water Binding in Legume Seeds

Vertucci, Christina W.; Leopold, A. C.

doi:10.1104/pp.85.1.224

Cited by 112 publications

(83 citation statements)

References 17 publications

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“…In the present study, the isotherms for T. superba, T. ivorensis, E. angolense, K. anthotheca and M. altissima are consistent with those of native species of Australia generated by Merritt et al (2003). They exhibited a reverse sigmoidal shape characteristic of orthodox species as reported by McDonald & Copeland (1996), but they varied from species to species due to differences in composition (Vertucci & Leopold, 1987;Vertucci & Roos, 1993). The curves have inflection points at approximately 13-25% RH for the boundary of sorption zones 1 and 2, and another at 60-80% RH for the boundary of sorption zones 2 and 3 at 20 °C.…”

Section: Water Sorption In G Kola Seedssupporting

confidence: 90%

“…Desiccation intolerant species have the monotonic shaped or a simple rising curve (Vertucci & Leopold 1987;Eira et al, 1999). Eira et al (1999) have reported that the shape of isotherms of coffee seed tissues was intermediate to the reverse sigmoidal shape observed for orthodox seeds and the monotonic shape observed for desiccation intolerant plant tissues.…”

Section: Water Sorption Isotherm Characteristics Of Seeds Of Six Indimentioning

confidence: 99%

“…Water sorption isotherms describe the relationship between relative humidity and the equilibrium seed moisture content at a given temperature (Reuss & Cassells, 2003). The exact nature of this relationship varies between different species as it is influenced by seed composition (Vertucci & Leopold, 1987) and temperature (Eira et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Water Sorption Isotherm Characteristics of Seeds of Six Indigenous Forest Tree Species in Ghana

Asomaning¹,

Sacandé²,

Olympio³

2011

West African Journal of Applied Ecology

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The relationship between storage temperature, relative humidity and seed water content was investigated for six indigenous forest tree seed species, namely Garcinia kola, Terminalia superba, Terminalia ivorensis, Mansonia altissima, Entandrophragma angolense and Khaya anthotheca in Ghana. Seeds were equilibrated over a series of lithium chloride solutions with relative humidities ranging from 12 to 93% and silica gel with relative humidity of 3% at 20 ºC. Seeds reached equilibrium with different days depending on seed size and structure, ranging from 13 days for E. angolense to 91 days for G. kola. When seeds equilibrated, moisture contents were determined gravimetrically, and values of moisture contents were then plotted against relative humidity to construct moisture sorption isotherms for the species. Seeds of T. superba, T. ivorensis, M. altissima, E. angolense and K. anthotheca, exhibited a sigmoidal relationship between seed water content and relative humidity indicative of three regions of water binding. Contrarily to other reports, the shape of the isotherm curve for G. kola -a desiccation sensitive species -also showed the reversed sigmoid pattern similar to isotherm curves of orthodox species rather than the monotonic shape. The isotherms showed that seed moisture content increased with increasing relative humidity. Seed samples of G. kola, placed at all relative humidities chambers, lost water(desorption) as the initial water content of 58% was very high and, therefore, possessed a higher water potential than the environments. Seeds of the other species either lost water (desorption) to the relative humidity chambers, or absorbed water from the chambers depending on the relative humidity of the environment they were placed.

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Section: Water Sorption In G Kola Seedssupporting

confidence: 90%

Section: Water Sorption Isotherm Characteristics Of Seeds Of Six Indimentioning

confidence: 99%

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Water Sorption Isotherm Characteristics of Seeds of Six Indigenous Forest Tree Species in Ghana

Asomaning¹,

Sacandé²,

Olympio³

2011

West African Journal of Applied Ecology

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“…Sorption and desorption isotherms were similar for the cultivars; however the cultivar Mulato 1 revealed different A w values on the extreme mc (Figure 2). The isotherms displayed consist of three regions, located at low, intermediate and high mc levels (Vertucci and Leopold, 1987).…”

Section: Resultsmentioning

confidence: 99%

Thermal and moisture content effects on storability and seed dormancy releasing on Brachiaria brizantha cultivars

Filho

Usberti²

2008

Rev. bras. sementes

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-Brachiaria species normally show a double seed dormancy mechanism, mainly on fresh-harvested seeds, leading to germination percentages lower than those of viability detected by tetrazolium test (TZ) and causing problems as to storage, trading and seed inspection activities. The adoption of the methodology to detect the constants of the viability equation (high storage temperatures and fixed moisture contents) made feasible in this research to isolate the effects of 40, 50 and 65°C on B. brizantha cultivars Marandu, Mulato 1 and Mulato 2 seed dormancy releasing, after storage with moisture contents ranging from 1.9 and 17.8%. Seed samples presented high dormancy levels, detected by TZ and it was complete and partially released by chemical scarification and accelerated ageing test, respectively. No statistical differences were observed as to the speed of germination (T 50 ); however, differences among cultivars were detected as to number of seed per gram. Sorption and desorption isotherm curves were similar for the cultivars. Seed dormancy releasing was better achieved at 40 and 50°C with mc ranging from 7.6 to 10.8%. The temperature of 50°C appears to be adequate for seed dormancy releasing in all mc analyzed. No significant seed dormancy releasing result was observed at 65°C. The cultivar Marandu presented the highest storability throughout the experiment.Index terms: activity of water, seed longevity, high storage temperatures. EFEITOS TÉRMICOS E DE GRAUS DE UMIDADE NA ARMAZENABILIDADE E NA LIBERAÇÃO DA DORMÊNCIA DE SEMENTES EM CULTIVARES DE Brachiaria brizanthaRESUMO -As espécies do gênero Brachiaria apresentam mecanismo duplo de dormência de sementes, principalmente nas recém colhidas, resultando em porcentagens de germinação inferiores às de viabilidade detectadas pelo teste de tetrazólio (TZ), causando deste modo problemas com relação ao armazenamento, comercialização e fiscalização do comércio. A metodologia para determinar as constantes da equação de viabilidade (altas temperaturas e graus de umidade constantes) mostrou-se eficiente nesta pesquisa para isolar os efeitos de temperaturas de 40, 50 e 65°C na liberação da dormência de sementes de B. brizantha dos cultivares Marandu, Mulato 1 e Mulato 2, após armazenamento com graus de umidade variando de 1,9 a 17,8%. As amostras de sementes apresentaram altos níveis de dormência, que foram detectadas pelo TZ e completa ou parcialmente liberada através da escarificação química e do teste de envelhecimento acelerado, respectivamente. As isotermas de sorção e desorção foram similares para os cultivares. A liberação da dormência foi mais bem sucedida a 40 e 50°C com graus de umidade variando de 7,6 to 10,8%. A temperatura de 50°C parece ser a mais adequada para a liberação da dormência em todos os graus de umidade analisados. Não foi observada uma liberação da dormência das sementes significativa a 65°C. O cultivar Marandu apresentou a maior armazenabilidade durante todo o experimento.Termos para indexação: atividade de água, longevidade de sementes, al...

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“…The isotherm obtained consists of three regions: one, at low moisture contents, in which moisture rises steeply for a small increase in RH (water sorption at strong binding sites); a second region, at intermediate moisture contents, in which the gradient is shallow (water sorption at weak binding sites) and a third region, at high moisture contents, in which moisture increases again more steeply for a small increase in RH (water sorption binding to already absorbed water molecules) (Vertucci & Leopold, 1987). Similar results have been recorded by Barker & Laird (1997), during moisture sorption/desorption experiments, using gin run cottonseeds, kept at 20°C.…”

Section: Resultsmentioning

confidence: 99%

Prediction of cottonseed longevity

Usberti¹,

Roberts

Ellis

2006

Pesq. agropec. bras.

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-The objective of this work was to determine the viability equation constants for cottonseed and to detect the occurrence and depletion of hardseededness. Three seedlots of Brazilian cultivars and IAC-20 were tested, using 12 moisture content levels, ranging from 2.2 to 21.7% and three storage temperatures, 40, 50 and 65ºC. Seed moisture content level was reached from the initial value (around 8.8%) either by rehydration, in a closed container, or by drying in desiccators containing silica gel, both at 20ºC. Twelve seed subsamples for each moisture content/temperature treatment were sealed in laminated aluminium-foil packets and stored in incubators at those temperatures, until complete survival curves were obtained. Seed equilibrium relative humidity was recorded. Hardseededness was detected at moisture content levels below 6% and its releasing was achieved either naturally, during storage period, or artificially through seed coat removal. The viability equation quantified the response of seed longevity to storage environment well with K E = 9.240, C W = 5.190, C H = 0.03965 and C Q = 0.000426. The lower limit estimated for application of this equation at 65 o C was 3.6% moisture content.Index terms: Gossypium hirsutum, seed storage, hardseededness, viability equation. Previsão da longevidade de sementes de algodoeiroResumo -O objetivo deste trabalho foi determinar as constantes da equação de viabilidade de sementes de algodoeiro e detectar a ocorrência de sementes duras. Três lotes de sementes das cultivares IAC-19 e IAC-20 foram testados, usando 12 níveis de umidade, entre 2,2 e 21,7% e três temperaturas de armazenamento, 40, 50 e 65ºC. O grau desejado de umidade das sementes foi alcançado, a 20ºC, a partir do valor inicial (em torno de 8,8%), por reidratação, em um recipiente fechado, ou por desidratação em dessecadores com sílica gel. Doze subamostras de sementes para cada tratamento de umidade/temperatura foram acondicionadas, em embalagens de alumínio multifoliadas, e armazenadas naquelas temperaturas, até a obtenção de curvas completas de deterioração. A umidade relativa de equilíbrio das sementes foi registrada. A presença de sementes duras foi detectada em umidades abaixo de 6% e a sua liberação foi alcançada durante o armazenamento ou por meio da remoção do tegumento da semente. A equação de viabilidade calculada foi eficaz em quantificar a resposta da longevidade das sementes em relação às condições de armazenamento por meio de K E = 9,240, C W = 5,190, C H = 0,03965 e C Q = 0,000426. O limite inferior estimado para aplicação dessa equação a 65 o C foi 3,6% de umidade.Termos para indexação: Gossypium hirsutum, armazenamento, sementes duras, equação de viabilidade.

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Water Binding in Legume Seeds

Cited by 112 publications

References 17 publications

Water Sorption Isotherm Characteristics of Seeds of Six Indigenous Forest Tree Species in Ghana

Water Sorption Isotherm Characteristics of Seeds of Six Indigenous Forest Tree Species in Ghana

Thermal and moisture content effects on storability and seed dormancy releasing on Brachiaria brizantha cultivars

Prediction of cottonseed longevity

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