Longevity of seeds

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Unformatted text preview: 6 84 56 94 50 72 58 5 62 52 79 43 97 28 63 46 25 36 84 62 73 28 52 85 67 18 0 72 2 51 0 87 0 26 44 82 28 13 52 68 64 74 34 86 34 68 14 62 76 38 83 67 43 26 96 84 39 Avrami parameters Years stored Slope 36.7 26.32 35.5 37.5 37.5 37.5 37.5 37.5 37.5 36.1 39.1 30.5 37.5 42.3 43.7 29.62 44.4 41.8 37.8 43.6 60.7 40.5 31.8 43.5 43.9 32.81 37.2 31.51 37.5 36.8 36.8 36.8 36.9 36.8 36.8 80.6 45.7 37.8 37.8 37.8 37.8 39.3 37.8 37.6 36.6 34.6 38 35.6 35.6 39.0 36.5 51.42 50.82 43.5 35.5 24.01 1.6 1.3 2.10 1.50 1.20 1.30 1.90 1.40 1.40 1.50 3.10 1.00 3.90 1.90 1.3 1.7 2.0 2.90 1.40 2.0 2.40 3.20 1.00 1.00 3.3 5.0 2.10 4.00 2.40 1.50 1.00 1.10 1.20 2.30 1.00 1.7 4.10 3.80 1.80 1.50 2.30 1.50 2.80 1.20 1.10 1.50 1.10 1.70 1.10 2.10 1.10 2.0 4.3 1.0 1.60 2.3 Intercept f P50 (years) 2 7.7 2 5.3 2 9.20 2 6.02 2 5.80 2 5.86 2 5.75 2 6.03 2 6.02 2 7.14 2 11.16 2 6.52 2 12.88 2 8.18 2 5.1 2 5.5 2 8.5 2 12.49 2 5.41 2 8.4 2 9.76 2 12.29 2 5.59 2 5.24 2 11.6 2 16.4 2 8.59 2 12.74 2 9.03 2 4.89 2 5.30 2 3.66 2 3.66 2 7.99 2 5.10 2 7.8 2 14.57 2 14.63 2 7.84 2 6.85 2 10.32 2 6.24 2 12.84 2 4.68 2 4.60 2 5.15 2 4.83 2 7.70 2 4.61 2 9.43 2 4.72 2 8.3 2 17.0 2 6.5 2 7.09 2 7.5 120.2 59.3 80.1 55.3 126.0 90.6 20.6 74.2 73.5 116.5 36.5 677.6 27.2 74.2 52.4 25.0 70.6 74.3 47.7 67.9 58.4 46.6 266.5 188.7 34.0 26.7 59.7 24.2 43.1 26.1 199.9 27.9 21.2 32.3 163.8 98.0 34.9 47.0 77.9 96.5 88.8 63.9 98.2 49.3 65.6 31.1 80.8 92.8 66.2 89.0 73.1 61.9 51.7 673.5 83.8 26.2 88 35 67 39 86 54 15 54 53 84 32 463 24 54 36 19 53 64 36 54 49 40 145 64 29 24 48 22 35 20 115 19 14 24 104 73 31 41 57 73 69 47 85 25 36 22 47 66 33 71 40 46 47 453 63 22 Longevity of seedbank-stored seeds 9 Table 1. Continued Family Genus Species Valerianaceae 1 Valerianella locusta Average Median Maximum Minimum Total Number 1 2 Germination (%) No. of Final accessions Initial 1 84 22 151 3 8220 1 41,847 91 92 99 39 276 58 64 100 0 276 Avrami parameters Years stored 43.8 38 38 81 16 276 Slope 1.70 1.8 1.5 5.4 1.0 276 Intercept 2 6.15 2 7.4 2 6.7 2 3.7 2 17.3 276 f P50 (years) 37.3 25 134 74 904 12 276 88 54 633 7 276 Time of storage at 2 188C was 15– 19 years (last germination test in the mid-1990s). Time of storage at 2 188C was 7– 11 years (last germination test was before 1990). to 0% [Datura ferox (Solanaceae), Datura leichhardtii, E. drobovii (Poaceae), Gossypium lobatum (Malvaceae), 37 years; Capsicum baccatum (Solanaceae), 33 years; Bromus sitchensis (Poaceae), 18 years] (Table 1). The rate at which seeds of the various species lost viability in storage was calculated from germination time courses pooled among accessions and harvest dates. Representative datasets for six species (Fig. 2) show individual storage time versus germination percentage data points (small open circles), a pooled time course calculated by averaging data in 4-year intervals (larger solid circles), and the fitted Avrami curve calculated from the pooled time course (solid curve). The large range of germination percentages among accessions with storage time underscores the variability of ageing rates of seeds with similar growth provenance...
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