Longevity of seeds

Species with p50s that longevity of seedbank stored

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Unformatted text preview: ed around the median in two or more experiments exhibited medium shelf-life, and include Helianthus annuus (Asteraceae), Linum usitatissimum (Linaceae), Papaver somniferum (Papaveraceae) and Trifolium pratense (Fabaceae). Species with P50s that Longevity of seedbank-stored seeds 13 Table 3. Seed longevity values for species in different surveys. Values represent the calculated time (in years) for germination to decline to 50% for all studies except Duvel’s experiment, which gives the years when maximum germination in the soil was measured (Toole and Brown, 1946). A rating of relative longevity is suggested in the right-hand column, based on comparisons of the species P50 with the median P50 for the indicated experiment. If the species P50 , (median P50 2 median P50 4 3) in two or more experiments, the species was considered relatively short-lived. If the species P50 . (median P50 þ median P50 4 3) in two or more experiments, the species was considered relatively long-lived. If (median P50 2 median P50 4 3) # species P50 # (median P50 þ median P50 4 3) consistently among storage experiments, the species was considered to have medium longevity. An assignment of ‘variable longevity’ indicates that the species P50 was in the lower third in one survey and the upper third in another survey. Longevities from Duvel’s experiment were not considered in the classification scheme Genus Species Brassica Daucus Isatis Nicotiana Phaseolus Ricinus Setaria Allium Apium Arachis Brassica Bromus Capsicum Carum Crambe Festuca Festuca Glycine Guizotia Lactuca Onobrychis Oryza Pastinaca Pennisetum Petroselinum Ulmus Allium Lepidium Lespedeza Lupinus Secale Solanum Tragopogon Trifolium Valerianella Zinnia Cichorium Dactylis Fagopyrum Helianthus Linum Lolium Lolium Lotus Papaver Phleum Poa Rheum Scorzonera Sesamum napus carota tinctoria tabacum vulgaris communis italica cepa graveolens hypogaea oleracea inermis annuum carvi abyssinica arundinacea (elatior) rubra max abyssinica sativa viciifolia sativa sativa glaucum crispum sp. ampeloprasum sativum cuneata (sericea) angustifolius cereale tuberosum porrifolius hybridum locusta violacea intybus glomerata esculentum annuus usitatissimum multiflorum perenne corniculatus somniferum pratense pratensis £ hybridum hispanica indicum NPGS 25 30 27 31 31 26 19 23 27 25 23 16 29 32 21 25 25 32 13 23 34 34 30 35 21 32 26 43 41 36 22 42 29 25 46 39 65 40 50 53 43 41 68 62 32 54 64 47 39 Stanwood (unpubl.) Ellis Viability Equations Priestley et al. 79 37 42 81 307 434 13.94 6.63 9.82 10.3 15.97 13.31 15 74 66 27 Roos and Davidson Toole and Brown Relative longevity 6 Variable Variable Variable Variable Variable Variable Variable Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Short Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium 35 10 46 26 5.43 4.11...
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