Temperature and Seed Storage Longevity

Dickie, John B.; Ellis, R. H.; Kraak, H.L.; Ryder, K.; Tompsett, P. B.

doi:10.1093/oxfordjournals.aob.a087924

Cited by 155 publications

(151 citation statements)

References 9 publications

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“…240 and 5.190. The values achieved for the constants C H = 0.03965 and C Q = 0.000426 show similarity to those obtained by Dickie et al (1990) after the statistical analysis of 359 survival curves of eight species (C H = 0.0329; C Q = 0.000478), therefore corroborates the accuracy of the results obtained and the reliability of the methodology used.…”

Section: Resultssupporting

confidence: 84%

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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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Section: Resultssupporting

confidence: 84%

“…This equation has already been applied to forest species (Dickie et al, 1990;Medeiros et al, 1998;Bonner, 1999;Chaves & Usberti, 2004). However, viability constants are specific for each species and therefore must be determined for each species of economic, ecological and scientific interest.…”

Section: Introductionmentioning

confidence: 99%

Prediction of cottonseed longevity

Usberti¹,

Roberts

Ellis

2006

Pesq. agropec. bras.

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“…To avoid the possible effect of different length of afterripening, the seed samples were frozen 2 days after collection and preserved until the experiment. Freezing storage of dry seeds delays ageing and preserves germinability for a long time (Roberts 1973;Ellis & Roberts 1980;Dickie et al 1990).…”

mentioning

confidence: 99%

The effect of cryopreservation on germination of dandelion seeds

Martinková¹,

Honěk²

2007

Plant Prot. Sci.

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Martinková Z., Honěk A. (2007): The effect of cryopreservation on germination of dandelion seeds. Plant Protect. Sci., 43: 63-67.Germination experiments frequently use seeds that had been stored frozen. We investigated whether short, 5 day freezing changes percentage and rate of germination of seeds of dandelion (Taraxacum officinale agg.). Seeds (i) collected at dispersal, (ii) dried at +50°C for 5 days, (iii) frozen at -20°C for 5 days, (iv) dried for 5 days and subsequently frozen for 5 days, and (v) frozen and subsequently dried, were then germinated at +10°C and a long-day photoperiod. None of the temperature pre-treatments affected the proportion of germinating seeds. By contrast, the time to germinate 50% of the seed (germination time) was shortened slightly (0.7 days) but significantly following the freezing treatment, regardless of whether it was applied without, before or after drying of the seed. Cryopreservation is therefore a convenient method of seed storage for comparative studies of seed germination because it causes no change in germination percentage and only a small and systematic change in germination rate.

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“…Dickie et al (1990) reported that the viability equation could be applied from -13 to 90°C and also observed a negative relationship between C W values and seed oil content, among different species. Medeiros et al (1998), using K E = 7.5498 and C W = 3.76 and adopting C H = 0.0329 and C Q = 0.000478 as universal constants, estimated the sigma value of 1,167 years for the species Astronium urundeuva (Fr.All.)…”

Section: Fantinatti Jb E Usberti Rmentioning

confidence: 96%

Comparisons between two economically valuable forest species (Eucalyptus grandis and Pinus taeda) in relation to seed behaviour under controlled deterioration

Fantinatti

Usberti²

2011

Rev. Árvore

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-The objectives of this work were to analyze seed behaviour under controlled deterioration and estimate viability equations for forest species Eucalyptus grandis and Pinus taeda. Desired moisture content levels were achieved from initial values after either rehydration over water or drying over silica gel, both at 25 o C. Seed sub samples with 8 moisture contents each for E. grandis (1.2 to 18.1%, initial value of 11.3%) and P. taeda (1.5 to 19.5%, initial value of 12.9%) were sealed in laminate aluminium-foil packets and stored in incubators maintained at 40, 50 and 65 o C. The seeds from these species exhibited true orthodox and sub-orthodox storage behaviour, respectively, however E. grandis showed higher seed storability, probably due to a different seed chemical composition. Lowest moisture content limits estimated for application of the viability equations at 65 o C were 4.9 and 4.1 mc for E. grandis and P. taeda, on equilibrium with ±20% RH. The viability equation estimated quantified the response of seed longevity to storage environment well with K E = 9.661 and 8.838; C W = 6.467 and 5.981; C H = 0.03498 and 0.10340; C Q = 0.0002330 and 0.0005476, for E. grandis and P. taeda, respectively. . COMPARAÇÕES ENTRE DUAS ESPÉCIES FLORESTAIS DE VALOR ECONÔMICO (Eucalyptus grandis AND Pinus taeda) COM RELAÇÃO AO COMPORTAMENTO DAS SEMENTES SOB DETERIORAÇÃO CONTROLADA RESUMO -Os objetivos deste trabalho foram analisar o comportamento de sementes sob deterioração controlada e estimar as equações de viabilidade das espécies florestais

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Temperature and Seed Storage Longevity

Cited by 155 publications

References 9 publications

Prediction of cottonseed longevity

Prediction of cottonseed longevity

The effect of cryopreservation on germination of dandelion seeds

Comparisons between two economically valuable forest species (Eucalyptus grandis and Pinus taeda) in relation to seed behaviour under controlled deterioration

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