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 Agricultural Genetic Resources Preservation Research: Fort Collins, CO
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ARS Home Plains Area Fort Collins, Colorado Center for Agricultural Resources Research Agricultural Genetic Resources Preservation Research Docs Seed







NPGS Base Collectionheadline bar Variety of seeds. Home Seed in the NPGS base collection comes from USDA-ARS-NPGS regional or crop specific field sites.  At the field sites, seeds are dried to ambient conditions and cleaned to remove empty seeds and chaff.  A sample of seed from each accession is retained at the field site for regeneration, multiplication, distribution, characterization and evaluation and comprises an active collection.  The NPGS base collection contains all the inventories of each accession including the original sample and earlier regenerations. This consolidated collection of all of NPGS holdings is stored at the NLGRP in secure freezers at -18°C.  The viability of stored seeds is periodically monitored using standard germination assays.   A fresh sample of seed is obtained if seed supply is too low or germination percent decreases below about 60%.  A fresh inventory usually contains between 1500 and 3000 seeds. As of February 16, 2017 the NPGS base collection stored at the NLGRP consisted of: Number of NPGS safety backup samples
445,722Number of NPGS unique accessions
566,345Number of Non-NPGS (black box) accessions
324,507Number of genera
1,893Number of species
9,279Percent NPGS seed accessions backed-up
85%Percent NPGS vegetatively-propagated accessions backed-up
14%


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