02014naa a2200265 a 450000100080000000500110000800800410001910000200006024500730008026000090015352013350016265000150149765000160151265000210152865000160154965000180156565000120158365300170159565300090161270000170162170000180163870000210165670000190167777300520169617889041996-05-30       1981    bl ---       0--  u    #d1 aTHOMPSON, P. A.  aCollection and regeneration of populations of wild plants from seed.  c1981  aFour methods of obtaining seeds of wild species of plants for long-term conservation in gene Banks were compared. (a) From collections growing within botanic gardens; (b) by making sample collections from wild populations and bulking up stocks by regeneration under cultivation; (c) by making arrangements with external collectors; (d) by organising plant collecting expeditions. Collections from plants in botanic garderns were unsatisfactory material on which to base collections. Regeneration under cultivation depends on exp[ertise and knowledge of the plant's cultural requirements which were frequently not available, leading to unacceptably heavy losses of individuals and selection of populations, during cultivation. Collecting seeds directly from populations of wild plants was, scientifically, the most successful method and costings showed it also to be economically the least demanding of resources. The results suggest that, except in special cases - perhaps with rare plants where natural populations are small-every effort should be made to obtain initial collections of seed which are large enough to fulfil all the purpose intended by long-term conservation. Collections of small numbers of seeds which require bulking up before they can be used should be avoided, as a waste of effort, time and plant resources.  apopulation  awild plants  aPlanta Silvestre  aPopulação  aRegeneração  aSemente  aRegeneration  aSeed1 aSMITH, R. D.1 aDICKIE, J. B.1 aSANDERSON, R. H.1 aPROBERT, R. J.  tBiological Conservationgv.20, p.229-245, 1981.