Pipeline for grain domestication

By Lee R. DeHaan,* David L. Van Tassel, James A. Anderson, Sean R. Asselin, Richard Barnes, Gregory J. Baute, Douglas J. Cattani, Steve W. Culman, Kevin M. Dorn, Brent S. Hulke, Michael Kantar, Steve Larson, M. David Marks, Allison J. Miller, Jesse Poland, Damian A. Ravetta, Emily Rude, Matthew R. Ryan, Don Wyse, and Xiaofei Zhangin Scientific Publications - March 11, 2016

ABSTRACT

In the interest of diversifying the global food system, improving human nutrition, and making agriculture more sustainable, there have been many proposals to domesticate wild plants or
complete the domestication of semi-domesticated “orphan” crops. However, very few new
crops have recently been fully domesticated. Many wild plants have traits limiting their
production or consumption that could be costly and slow to change. Others may have
fortuitous pre-adaptations that make them easier to develop or feasible as high-value, albeit
low-yielding, crops. To increase success in contemporary domestication of new crops, we
propose a “pipeline” approach, with attrition expected as species advance through the pipeline.
We list criteria for ranking domestication candidates to help enrich the starting pool with more
pre-adapted, promising species. We also discuss strategies for prioritizing initial research efforts
once the candidates have been selected: developing higher value products and services from
the crop, increasing yield potential, and focusing on overcoming undesirable traits. Finally, we
present new-crop case studies which demonstrate that wild species' limitations and potential
(in agronomic culture, shattering, seed size, harvest, cleaning, hybridization, etc.) are often only
revealed during the early phases of domestication. When nearly insurmountable barriers were
reached in some species, they have been (at least temporarily) eliminated from the pipeline.
Conversely, a few species have moved quickly through the pipeline as hurdles such as low seed
weight or low seed number per head were rapidly overcome, leading to increased confidence,
farmer collaboration, and program expansion.

 

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