The longevity of desorbing and adsorbing rice seeds
In each of two experiments, freshly harvested seeds of two cultivars of rice were dried and then rehydrated to different moisture levels. In experiment 1, seed equilibrium relative humidity (eRH) and moisture content (MC) were determined at each moisture level so that moisture desorption and adsorpt...
| Autores principales: | , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Cambridge University Press
2016
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| Acceso en línea: | https://hdl.handle.net/10568/165169 |
| _version_ | 1855532866628222976 |
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| author | Hay, Fiona R. Timple, Stephen |
| author_browse | Hay, Fiona R. Timple, Stephen |
| author_facet | Hay, Fiona R. Timple, Stephen |
| author_sort | Hay, Fiona R. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In each of two experiments, freshly harvested seeds of two cultivars of rice were dried and then rehydrated to different moisture levels. In experiment 1, seed equilibrium relative humidity (eRH) and moisture content (MC) were determined at each moisture level so that moisture desorption and adsorption isotherms could be constructed. Seed storage experiments were also carried out for seeds equilibrated at each moisture level, in sealed aluminium foil packets at 45°C. In experiment 2, storage experiments at 45°C were carried out on seeds dried to 12% MC and seeds dried to lower moisture levels and then rehydrated to 12% MC.The moisture adsorption isotherm was shifted to lower MC at a given eRH compared with the desorption isotherm. This hysteresis effect was seen both when seeds were dried to <6% MC and then allowed to adsorb moisture to different levels, and when seeds were dried to different levels (10, 8, 6 or 4% MC) and then allowed to adsorb moisture up to 12% MC. The log-log relationship between seed longevity, σ [the standard deviation of the normal distribution of seed deaths over time, as defined in the Ellis and Roberts (1980) seed viability equations] and seed storage MC did not vary depending on whether the seeds were desorbing or adsorbing moisture. The relationship between σ and eRH was better described by a log-log model than a log-linear model and did vary depending on whether seeds were desorbing or adsorbing moisture: at a given eRH, the longevity of adsorbing seeds was greater than that of desorbing seeds. The implications for seed storage are discussed. |
| format | Journal Article |
| id | CGSpace165169 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace1651692024-12-19T14:13:06Z The longevity of desorbing and adsorbing rice seeds Hay, Fiona R. Timple, Stephen In each of two experiments, freshly harvested seeds of two cultivars of rice were dried and then rehydrated to different moisture levels. In experiment 1, seed equilibrium relative humidity (eRH) and moisture content (MC) were determined at each moisture level so that moisture desorption and adsorption isotherms could be constructed. Seed storage experiments were also carried out for seeds equilibrated at each moisture level, in sealed aluminium foil packets at 45°C. In experiment 2, storage experiments at 45°C were carried out on seeds dried to 12% MC and seeds dried to lower moisture levels and then rehydrated to 12% MC.The moisture adsorption isotherm was shifted to lower MC at a given eRH compared with the desorption isotherm. This hysteresis effect was seen both when seeds were dried to <6% MC and then allowed to adsorb moisture to different levels, and when seeds were dried to different levels (10, 8, 6 or 4% MC) and then allowed to adsorb moisture up to 12% MC. The log-log relationship between seed longevity, σ [the standard deviation of the normal distribution of seed deaths over time, as defined in the Ellis and Roberts (1980) seed viability equations] and seed storage MC did not vary depending on whether the seeds were desorbing or adsorbing moisture. The relationship between σ and eRH was better described by a log-log model than a log-linear model and did vary depending on whether seeds were desorbing or adsorbing moisture: at a given eRH, the longevity of adsorbing seeds was greater than that of desorbing seeds. The implications for seed storage are discussed. 2016-12 2024-12-19T12:54:46Z 2024-12-19T12:54:46Z Journal Article https://hdl.handle.net/10568/165169 en Cambridge University Press Hay, Fiona R.; Timple, Stephen. 2016. The longevity of desorbing and adsorbing rice seeds. Seed Sci. Res., Volume 26 no. 4 p. 306-316 |
| spellingShingle | Hay, Fiona R. Timple, Stephen The longevity of desorbing and adsorbing rice seeds |
| title | The longevity of desorbing and adsorbing rice seeds |
| title_full | The longevity of desorbing and adsorbing rice seeds |
| title_fullStr | The longevity of desorbing and adsorbing rice seeds |
| title_full_unstemmed | The longevity of desorbing and adsorbing rice seeds |
| title_short | The longevity of desorbing and adsorbing rice seeds |
| title_sort | longevity of desorbing and adsorbing rice seeds |
| url | https://hdl.handle.net/10568/165169 |
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