A Comparison of the Low-Moisture-Content Limit to the Logarithmic Relation Between Seed Moisture and Longevity in Twelve Species

Ellis, R. H.; Hong, T. D.; Roberts, Ε. H.

doi:10.1093/oxfordjournals.aob.a087788

Cited by 111 publications

(114 citation statements)

References 6 publications

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“…Additional subsamples from all mc levels before storage were taken to detect the relation between seed mc and equilibrium relative humidity, at 20±0.5°C, through a Novasina Humidat IC1, previously calibrated at 12, 55 and 94% RH, using appropriate standard salts (Ellis et al, 1989).…”

Section: Methodsmentioning

confidence: 99%

“…This could be achieved using the viability equation, proposed by Ellis & Roberts (1980), which relates seedlot viability of any initial quality to moisture and temperature, after any given storage period (Ellis et al, 1989). The equation is: v = K i -p/10 K E -C W log m C H t-C Q t² , where v is the probit percentage viability after p days of storage at m% moisture content (mc, f. wt.…”

Section: Introductionmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of cottonseed longevity

Usberti¹,

Roberts

Ellis

2006

Pesq. agropec. bras.

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“…1). Rice grains, on the other hand, can survive dehydration to water contents as low as 2% if rehydration occurs slowly to avoid imbibitional damage (Ellis et al, 1989). Severa1 methods of slowly increasing the water content of wild rice grains did not improve survival, making it unlikely that the reduced viability at low water contents can be attributed to imbibitional damage.…”

Section: Sensitivity Of Wild Rice Embryos To Dehydrationmentioning

confidence: 99%

“…Seeds exhibit a range of tolerances to dehydration, from completely intolerant to survival of water contents as low as 2% (Roberts, 1973;Farrant et al, 1988;Ellis et al, 1989).…”

Section: Dlscusslonmentioning

confidence: 99%

Development of Desiccation Tolerance during Embryogenesis in Rice (Oryza sativa) and Wild Rice (Zizania palustris) (Dehydrin Expression, Abscisic Acid Content, and Sucrose Accumulation)

1994

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The ability of seeds to withstand desiccation develops during embryogenesis and differs considerably among species. Paddy rice (Oryza sativa 1.) grains readily survive dehydration to as low as 2% water content, whereas North American wild rice (Zizania palusfris var inferior [Fasset] Dore) grains are not tolerant of water contents below 6% and are sensitive to drying and imbibition conditions. During embryogenesis, dehydrin proteins, abscisic acid (ABA), and saccharides are synthesized, and all have been implicated in the development of desiccation tolerance. We examined the accumulation patterns of dehydrin protein, ABA, and soluble saccharides (sucrose and oligosaccharides) of rice embryos and wild rice axes in relation to the development of desiccation tolerante during embryogenesis. Dehydrin protein was deteded immunologically with an antibody raised against a conserved dehydrin amino acid sequence. Both rice and wild rice embryos accumulated a 21-kD dehydrin protein during development, and an immunologically related 38-kD protein accumulated similarly in rice. Dehydrin protein synthesis was deteded before desiccation tolerance had developed in both rice embryos and wild rice axes. However, the major accumulation of dehydrin occurred after most seeds of both species had become desiccation tolerant. ABA accumulated in wild rice axes to about twice the amount present in rice embryos. There were no obvious relationships between ABA and the temporal expression patterns of dehydrin protein in either rice or wild rice. Wild rice axes accumulated about twice as much sucrose as rice embryos. Oligosaccharides were present at only about one-tenth of the maximum sucrose concentrations in both rice and wild rice. We conclude that the desiccation sensitivity displayed by wild rice grains is not due to an inability to synthesize dehydrin proteins, ABA, or soluble carbohydrates.Most seeds enter a period of desiccation and physiological quiescence during the last phase of development. However, there are considerable differences among species in their ability to survive desiccation. Orthodox seeds such as paddy rice (Oryza sativa L.) caryopses readily tolerate desiccation to <5% water content, and their longevity in storage increases as temperature and water content decrease (Roberts, 1973 for example, are tolerant of desiccation only under restricted dehydration and rehydration conditions. Wild rice is an aquatic grass whose seeds (caryopses) normally abscise at a relatively high moisture content, fall into the water, remain dormant through the winter, and genninate the following spring. Wild rice seeds were thought to be intolerant of dehydration <30% moisture content (Probert and Brierly, 1989; Probert and Longley, 1989), but the seeds can survive dehydration to as low as 6% moisture content if dehydration and rehydration occur at 15 to 25OC and imbibitional damage is avoided (Kovach and Bradford,

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“…The estimate of C RH , 0.0263 (Table 2), did not differ among these Nothofagus species, and so all five showed a 1.8-fold increase in longevity with each 10% reduction in equilibrium relative humidity. This estimate is lower than 0.0346 and 0.0376 reported for certain crop seeds Ellis et al, 1989Ellis et al, , 1990 or 0.0356 for the parasitic weed Orobanche species (Kebreab and Murdoch, 1999), but greater than that of 0.0207 for the tropical tree Astronium urundeuva (Medeiros et al, 1998). Hence, these results for Nothofagus do not support the concept of a universal value of C RH for plant species.…”

Section: Discussionmentioning

confidence: 62%

Seed survival in Chilean Nothofagus in response to desiccation and storage

León‐Lobos

Ellis

2005

Seed Sci. Res.

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Nothofagus alpina, N. obliqua, N. glauca, N. leonii, N. dombeyi and N. pumilio seeds exhibited consistent, albeit slight, sensitivity to extreme desiccation, but nevertheless maintained viability at low moisture contents and cool temperatures (2 108 to 2 208C) over 2 years. Nothofagus alpina, N. obliqua, N. glauca, N. leonii and N. dombeyi conformed to the seed viability equation of Ellis and Roberts; sensitivity of longevity to temperature was quantitatively similar to that of crop seeds, sensitivity to moisture was somewhat less, and a low-moisture-content limit to the equation was detected at 4.8% moisture content in hermetic storage at 65 8C, and possibly similar moisture contents at 30 -408C. These five species show orthodox seed storage behaviour. Therefore, ex-situ conservation of these Nothofagus species in seed banks is possible, but the quality of seed lots collected requires attention. Seed storage behaviour was not defined in N. pumilio: initial seed quality was poor and loss of viability was detected over 2 years at 08, 2108 and 2 208C at 2.7% moisture content, but not at 5.2%. The results confirm that the economy of nature in seed storage physiology extends to forest tree seeds, but the repeated observation of reduced sensitivity of longevity to moisture in forest tree seeds requires further investigation.

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A Comparison of the Low-Moisture-Content Limit to the Logarithmic Relation Between Seed Moisture and Longevity in Twelve Species

Cited by 111 publications

References 6 publications

Prediction of cottonseed longevity

Prediction of cottonseed longevity

Development of Desiccation Tolerance during Embryogenesis in Rice (Oryza sativa) and Wild Rice (Zizania palustris) (Dehydrin Expression, Abscisic Acid Content, and Sucrose Accumulation)

Seed survival in Chilean Nothofagus in response to desiccation and storage

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