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Keywords:

  • center of origin;
  • conservation;
  • domestication;
  • domestication syndrome;
  • ethnobotanical uses;
  • food crops;
  • life history;
  • selection

Contents

 Summary29
I.Introduction30
II.Key concepts and definitions30
III.Methods of review and analysis35
IV.Trends identified from the review of 203 crops37
V.Life cycle38
VI.Ploidy level40
VII.Reproductive strategies42
VIII.The domestication syndrome42
IX.Spatial and temporal trends42
X.Utilization of plant parts44
XI.Conclusions44
 Acknowledgements45
 References45

Summary

Domesticated food crops are derived from a phylogenetically diverse assemblage of wild ancestors through artificial selection for different traits. Our understanding of domestication, however, is based upon a subset of well-studied ‘model’ crops, many of them from the Poaceae family. Here, we investigate domestication traits and theories using a broader range of crops. We reviewed domestication information (e.g. center of domestication, plant traits, wild ancestors, domestication dates, domestication traits, early and current uses) for 203 major and minor food crops. Compiled data were used to test classic and contemporary theories in crop domestication. Many typical features of domestication associated with model crops, including changes in ploidy level, loss of shattering, multiple origins, and domestication outside the native range, are less common within this broader dataset. In addition, there are strong spatial and temporal trends in our dataset. The overall time required to domesticate a species has decreased since the earliest domestication events. The frequencies of some domestication syndrome traits (e.g. nonshattering) have decreased over time, while others (e.g. changes to secondary metabolites) have increased. We discuss the influences of the ecological, evolutionary, cultural and technological factors that make domestication a dynamic and ongoing process.