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Global conservation priorities for crop wild relatives


The wild relatives of domesticated crops possess genetic diversity useful for developing more productive, nutritious and resilient crop varieties. However, their conservation status and availability for utilization are a concern, and have not been quantified globally. Here, we model the global distribution of 1,076 taxa related to 81 crops, using occurrence information collected from biodiversity, herbarium and gene bank databases. We compare the potential geographic and ecological diversity encompassed in these distributions with that currently accessible in gene banks, as a means to estimate the comprehensiveness of the conservation of genetic diversity. Our results indicate that the diversity of crop wild relatives is poorly represented in gene banks. For 313 (29.1% of total) taxa associated with 63 crops, no germplasm accessions exist, and a further 257 (23.9%) are represented by fewer than ten accessions. Over 70% of taxa are identified as high priority for further collecting in order to improve their representation in gene banks, and over 95% are insufficiently represented in regard to the full range of geographic and ecological variation in their native distributions. The most critical collecting gaps occur in the Mediterranean and the Near East, western and southern Europe, Southeast and East Asia, and South America. We conclude that a systematic effort is needed to improve the conservation and availability of crop wild relatives for use in plant breeding.

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Figure 1: Crop wild relative taxon richness map.
Figure 2: Collecting and conservation priorities for crop wild relatives by associated crop.
Figure 3: Collecting priorities for crop wild relatives and the importance of associated crops.
Figure 4: Proposed hotspots for further collecting activities for high-priority crop wild relatives.

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  1. Tilman, D. & Clark, M. Global diets link environmental sustainability and human health. Nature 515, 518–522 (2014).

    Article  CAS  Google Scholar 

  2. Khoury, C. K. et al. Increasing homogeneity in global food supplies and the implications for food security. Proc. Natl Acad. Sci. USA 111, 4001–4006 (2014).

    Article  CAS  Google Scholar 

  3. Foley, J. A. et al. Solutions for a cultivated planet. Nature 478, 337–342 (2011).

    Article  CAS  Google Scholar 

  4. Godfray, H. C. J. et al. Food security: the challenge of feeding 9 billion people. Science 327, 812–818 (2010).

    Article  CAS  Google Scholar 

  5. Tilman, D., Balzer, C., Hill, J. & Befort, B. L. Global food demand and the sustainable intensification of agriculture. Proc. Natl Acad. Sci. USA 108, 20260–20264 (2011).

    Article  CAS  Google Scholar 

  6. Ray, D. K., Mueller, N. D., West, P. C. & Foley, J. A. Yield trends are insufficient to double global crop production by 2050. PLoS One 8, e66428 (2013).

    Article  CAS  Google Scholar 

  7. Cordell, D., Drangert, J.-O. & White, S. The story of phosphorus: global food security and food for thought. Global Environ. Change 19, 292–305 (2009).

    Article  Google Scholar 

  8. Asseng, S. et al. Rising temperatures reduce global wheat production. Nature Clim. Change 5, 143–147 (2015).

    Article  Google Scholar 

  9. Zhu, Y. et al. Genetic diversity and disease control in rice. Nature 406, 718–722 (2000).

    Article  CAS  Google Scholar 

  10. McCouch, S. et al. Feeding the future. Nature 499, 23–24 (2013).

    Article  CAS  Google Scholar 

  11. Esquinas-Alcázar, J. Protecting crop genetic diversity for food security: political, ethical and technical challenges. Nature Rev. Genet. 6, 946–953 (2005).

    Article  Google Scholar 

  12. Hajjar, R. & Hodgkin, T. The use of wild relatives in crop improvement: a survey of developments over the last 20 years. Euphytica 156, 1–13 (2007).

    Article  Google Scholar 

  13. Xiao, J., Grandillo, S., Ahn, S. N., McCouch, S. R. & Tanksley, S. D. Genes from wild rice improve yield. Nature 384, 356–358 (1996).

    Article  Google Scholar 

  14. Gur, A. & Zamir, D. Unused natural variation can lift yield barriers in plant breeding. PLoS Biol. 2, e245 (2004).

    Article  Google Scholar 

  15. McCouch, S. R. et al. Through the genetic bottleneck: O. rufipogon as a source of trait-enhancing alleles for O. sativa. Euphytica 154, 317–339 (2007).

    Article  CAS  Google Scholar 

  16. Tanksley, S. D. & McCouch, S. R. Seed banks and molecular maps: unlocking genetic potential from the wild. Science 277, 1063–1066 (1997).

    Article  CAS  Google Scholar 

  17. Guarino, L. & Lobell, D. B. A walk on the wild side. Nature Clim. Change 1, 374–375 (2011).

    Article  Google Scholar 

  18. McCouch, S. R., McNally, K. L., Wang, W. & Hamilton, R. S. Genomics of gene banks: a case study in rice. Am. J. Bot. 99, 407–423 (2012).

    Article  Google Scholar 

  19. Vincent, H. et al. A prioritized crop wild relative inventory to help underpin global food security. Biol. Conserv. 167, 265–275 (2013).

    Article  Google Scholar 

  20. Food and Agriculture Organization of the United Nations (FAO) The Second Report on the State of the World‘s Plant Genetic Resources for Food and Agriculture (Commission on Genetic Resources for Food and Agriculture, FAO, 2010).

  21. Jarvis, A., Lane, A. & Hijmans, R. J. The effect of climate change on crop wild relatives. Agric. Ecosyst. Environ. 126, 13–23 (2008).

    Article  Google Scholar 

  22. Wilkes, G. Urgent notice to all maize researchers: disappearance and extinction of the last wild Teosinte population is more than half completed. A modest proposal for Teosinte evolution and conservation in situ: the Balsas, Guerrero, Mexico. Maydica 52, 49–58 (2007).

    Google Scholar 

  23. Brummitt, N. A. et al. Green plants in the red: a baseline global assessment for the IUCN sampled Red List Index for plants. PLoS One 10, e0135152 (2015).

    Article  Google Scholar 

  24. Dempewolf, H. et al. Adapting agriculture to climate change: a global initiative to collect, conserve, and use crop wild relatives. Agroecol. Sustain. Food Syst. 38, 369–377 (2013).

    Article  Google Scholar 

  25. Ramírez-Villegas, J., Khoury, C., Jarvis, A., Debouck, D. G. & Guarino, L. A gap analysis methodology for collecting crop gene pools: a case study with Phaseolus beans. PLoS One 5, e13497 (2010).

    Article  Google Scholar 

  26. Vavilov, N. I. Centers of origin of cultivated plants. Bull. Appl. Bot. Plant Breed. 16, (1926).

  27. Myers, N., Mittermeier, R. A., Mittermeier, C. G., da Fonseca, G. A. B. & Kent, J. Biodiversity hotspots for conservation priorities. Nature 403, 853–858 (2000).

    Article  CAS  Google Scholar 

  28. Secretariat of the Convention on Biological Diversity (CBD). Decision X/2. The Strategic Plan for Biodiversity 2011-2020 and the Aichi Biodiversity Targets (2010).

  29. Food and Agriculture Organization of the United Nations (FAO). International Treaty on Plant Genetic Resources for Food and Agriculture (2009).

  30. Secretariat of the Convention on Biological Diversity (CBD). Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from their Utilization to the Convention on Biological Diversity (2011).

  31. Wiersema, J. H., León, B. & Garvey, E. J. in ISHS Acta Horticulturae 948 I International Symposium Wild Relatives of Subtropical Temperate Fruit and Nut Crops (eds Aradhya, M. K. & Kluepfel, D. A. ) 285–288 (ISHS, 2012).

    Google Scholar 

  32. Eckert, C. G., Samis, K. E. & Lougheed, S. C. Genetic variation across species’ geographical ranges: the central-marginal hypothesis and beyond. Mol. Ecol. 17, 1170–1188 (2008).

    Article  CAS  Google Scholar 

  33. Goodwin, Z. A., Harris, D. J., Filer, D., Wood, J. R. I. & Scotland, R. W. Widespread mistaken identity in tropical plant collections. Curr. Biol. 25, R1066–R1067 (2015).

    Article  CAS  Google Scholar 

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We thank J. Wiersema and B. León for major contributions to taxonomic concepts; the herbaria, gene banks, researchers and other sources that contributed occurrence data to the analysis (Supplementary Table 3); the expert evaluators of gap analysis results (Supplementary Table 4); S. Calderón, I. Vanegas, H. Tobón, D. Arango, H. Dorado and E. Guevara for data inputs and processing; and S. Prager for comments. This work was undertaken as part of the project ‘Adapting Agriculture to Climate Change: Collecting, Protecting and Preparing Crop Wild Relatives’, which is supported by the Government of Norway. The project is managed by the Global Crop Diversity Trust and the Millennium Seed Bank of the Royal Botanic Gardens, Kew, and implemented in partnership with national and international gene banks and plant breeding institutes around the world. For further information, visit the project website: Funding was also provided by the CGIAR Research Program on Climate Change, Agriculture, and Food Security, Cali, Colombia.

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N.P.C.-A., C.K.K., H.D., R.J.E., L.G., A.J., N.M., J.M., J.R-V. and J.T. conceived and designed the study. N.P.C.-A., C.K.K., H.D., R.J.E., R.H.H., A.J., N.M., J.R-V., C.C.S. and H.V. acquired and contributed data. N.P.C.-A., C.K.K., H.A.A., V.B. and C.C.S. processed the data, performed the analyses and analysed the results. N.P.C.-A., C.K.K., H.D., R.J.E., L.G., A.J., N.M. and J.M. interpreted the results and wrote the manuscript. N.P.C.-A., C.K.K., V.B., H.D., R.J.E., L.G., A.J., N.M., J.M., J.R-V. and P.C.S. edited the manuscript.

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Correspondence to Nora P. Castañeda-Álvarez.

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Castañeda-Álvarez, N., Khoury, C., Achicanoy, H. et al. Global conservation priorities for crop wild relatives. Nature Plants 2, 16022 (2016).

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