Viability monitoring intervals for genebank samples of Oryza sativa
Viability monitoring data from germination tests carried out on rice seeds placed into storage in the active and base collections of the T.T. Chang Genetic Resources Center at IRRI between 1980 and 2002 were considered with a view to introducing efficiencies with respect to the number of germination tests carried out each year. It is recommended that testing of seeds stored in the base collection is delayed until a fail result (≤ 85% germination) is observed for seeds in the active collection (seeds from the same seed lot). Based on the historical data, a fail result for the base sample before the active sample would have been missed for only a small number of seed lots. Despite evidence that accessions originating from some countries (particularly temperate countries) produce seed lots that show ≤ 85% germination sooner than seed lots of accessions originating from other countries, it is not recommended that any change is made to the frequency of testing seeds stored in the active collection at the present time. This is because there is evidence that seeds from the most recent crop years included in the study (1997-2002) had lower initial quality and/or lost viability faster than seeds from earlier crop years.
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Document Type: Research Article
Publication date: August 1, 2015
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