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- W313208164 abstract "To secure a gene pool for future breeding programmes huge numbers of crop plant accessions have been gathered in gene banks. However, at least 50 to 60% of the total genetic variation of initial collections of barley landraces resides within individual accessions, the remainder between them. Maintenance of accessions held as seed samples in cold stores involves frequent rejuvenation cycles to ensure the viability of seeds. This has the potential to create population bottlenecks, leading to loss of genetic diversity. Barley landraces from Syria that had been stored for 10, 39 and 72 years were compared with genetic diversity levels in barley landraces collected recently in Syria. Genetic diversity indices assessed for morphological and isozyme markers showed very significant declines with length of time in storage. Assuming a mean time between rejuvenation of 5.3 years, gene diversity within accessions decreased on average by approximately 10% with every cycle of rejuvenation. The effective population size N e of 4.8 suggests that only 10 unrelated parent plants contributed seeds to the following generation. Results may have implications for gene bank management." @default.
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- W313208164 date "2001-01-01" @default.
- W313208164 modified "2023-09-27" @default.
- W313208164 title "Genetic diversity of barley landrace accessions (Hordeum vulgare ssp vulgare) conserved for different lengths of time in ex-situ gene banks" @default.
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