Diversity 2012, 4, 1-32; doi:10.3390/d4010001 OPEN ACCESS diversity ISSN 1424-2818 www.mdpi.com/journal/diversity Article Social Organization of Crop Genetic Diversity. The G × E × S Interaction Model Christian Leclerc 1,* and Geo Coppens d’Eeckenbrugge 2 1 CIRAD, UMR AGAP, Avenue Agropolis, TA A 96/03, Montpellier 34398, France 2 CIRAD, UMR 5175 CEFE, 1919 Route de Mende, Montpellier 34293, France; E-Mail:
[email protected] * Author to whom correspondence should be addressed; E-Mail:
[email protected]; Tel.: +33-467-61-71-16; Fax: +33-467-61-56-05. Received: 25 October 2011; in revised form: 28 November 2011 / Accepted: 12 December 2011 / Published: 21 December 2011 Abstract: A better knowledge of factors organizing crop genetic diversity in situ increases the efficiency of diversity analyses and conservation strategies, and requires collaboration between social and biological disciplines. Four areas of anthropology may contribute to our understanding of the impact of social factors on crop diversity: ethnobotany, cultural, cognitive and social anthropology. So far, most collaborative studies have been based on ethnobotanical methods, focusing on farmers’ individual motivations and actions, and overlooking the effects of farmer’s social organization per se. After reviewing common shortcomings in studies on sorghum and maize, this article analyzes how social anthropology, through the analysis of intermarriage, residence and seed inheritance practices, can contribute to studies on crop genetic diversity in situ. Crop varieties are thus considered social objects and socially based sampling strategies can be developed. Such an approach is justified because seed exchange is built upon trust and as such seed systems are embedded in a pre-existing social structure and centripetally oriented as a function of farmers’ social identity.