Crop genetic diversity in the field and on the farm: principles and applications in research practices

Introduction and overview

The origins of agriculture, crop domestication, and centers of diversity

Plant genetic resources, conservation, and politics : a history of international and national developments supporting the conservation and use of crop diversity

Diversity and its evolution in crop populations

Abiotic and biotic components of agricultural ecosystems

Diversity in, and adaptation to, adverse environments on-farm

Who are the managers of diversity? Characterizing the social, cultural, and economic environments

Measuring the values of on-farm diversity

Policy and genetic diversity on-farm

Farm, community, and landscape : genetic diversity and selection pressures at different social, spatial, and temporal scales

Strategies for collaboration and intervention

Conclusions : traditional varieties and agricultural productivity

Appendix A : software packages useful for analyzing molecular data

Appendix B : geographic information systems and remote sensing resources available on the internet

Appendix C : a selection of PPB champions through the ages.