Journal
SEED SCIENCE RESEARCH
Volume 26, Issue 4, Pages 306-316Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0960258516000222
Keywords
Genebank; moisture isotherm; Oryza sativa; rice; seed drying; seed storage; viability equation
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Funding
- German Federal Ministry for Economic Cooperation and Development (BMZ) through the Deutsche Gesellschaft fur Internationale Zusammenarbeit (GIZ) GmbH
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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 degrees C. In experiment 2, storage experiments at 45 degrees 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, sigma [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 sigma 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.
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