Costing the conservation of genetic resources: CIMMYT's ex situ maize and wheat collection

Worldwide, the number of genebanks(1) and the amount of seed stored in them has increased substantially over the past few decades. Most attention is f ocused on the likely benefits of conservation, but conserving germplasm inv olves costs whose nature and magnitude are largely unknown. Moreover, these costs place a lower bound on the benefits deemed likely to justify the exp ense of conserving seed. In this study, we compile and use a set of cost da ta for wheat (Triticum aestivum L.) and maize (Zea mays L.), stored in the CIMMYT genebank to address a number of questions. The marginal costs of hol ding an existing accession for one more year are presented, along with the costs of conserving saved seed for the life of the genebank (taken here to be 40 yr), and in perpetuity We also investigated the scale economies evide nt in the CIMMYT genebank operation as a basis for assessing the economics of consolidating several genebanks. For accessions known to satisfy viabili ty requirements, it costs just $0.19 and $0.93 to carry over an existing ac cession of wheat and maize respectively, for one more year; $7.19 and $30.2 4 to store an accession of each crop for the life of a genebank, and $10.26 and $58.85 to conserve accessions in perpetuity. Under baseline assumption s about interest rates, capital depreciation and regeneration regimes, the present value of conserving the existing accessions in perpetuity at CIMMYT is $8.86 million-$3.87 million for storing the 123 000 wheat accessions an d $4.99 million for the 17 000 maize samples. Maintaining the current level of effort to distribute accessions free-of-charge to those who request the m would cost an additional $5.28 million in perpetuity.