A new integrative indicator to assess crop genetic diversity

Bonneuil, C. and Goffaux, R. and Bonnin, I. and et al, . (2012) A new integrative indicator to assess crop genetic diversity. Ecological Indicators, 23. pp. 280-289.

[img] PDF - Published Version
Restricted to ICRISAT researchers only


Various international initiatives have emerged to develop new sets of biodiversity indicators for wild biodiversity but little progress has been made for crop diversity. This study proposes a new methodology to assess the diversity of cultivated species. We developed a new integrative indicator HT* that takes account of varietal richness, spatial evenness, between-variety genetic diversity, and within-variety genetic diversity. This index is compared to existing indexes using a comprehensive historical dataset from a French territory. The study reveals that more varieties (the varietal richness factor) can mean less diversity when (i) their genetic structure is more similar (the effect of between-variety genetic diversity), or (ii) when more diverse landraces are replaced by many homogeneous lines (the effect of within-variety genetic diversity) or (iii) when one or a few varieties become hegemonic in the landscape (the spatial evenness effect). Furthermore, an increased evenness in variety distribution (varietal evenness) can also mean less diversity when varieties are genetically related. This is why indicators which do not take into account the full range of factors (varietal richness, between-variety genetic diversity, spatial evenness and within-variety genetic diversity) may provide a misleading assessment of the state and trend of crop biodiversity. New integrative indicators such as HT* are critically needed. We discuss potential further development such as the use of this indicator for monitoring and the perspective of a broader indicator to assess genetic diversity at the multi-species scale and landscape level. In the future, this indicator could be used to guide managerial decisions to prevent the erosion of crop genetic diversity in agricultural landscapes.

Item Type: Article
Additional Information: We thank Nathalie Galic for technical help in handling the seeds for the different accessions and varieties, as well as the Clermont- Ferrand INRA plateform for the SSR genotyping. We thank the genebanks (Centre de Ressources Génétiques Céréales à Paille INRA, Clermont-Ferrand, France; Gene Bank of Slovak Republic. Piestany, Slovak Republic; National Centre for Plant Genetic Resources. Radzików, Poland; Central Agricultural Office Department for Agrobotany. Tapioszele, Hungary; Nordic Genetic Resource Center. Alnarp, Sweden; Leibniz Institute of Plant Genetics and Crop Plant Research, Gatersleben, Germany; Research Institute of Crop Production, Praha-Ruzyne, Czech Republic) for providing samples of seeds of bread wheat accessions and private seed companies (Nickerson and Secobra Recherche) for providing seeds of their varieties. We thank Julie Dawson for her carreful reading and editing of the manuscript. This research was partly funded by the FRB (Foundation for Research in Biodiversity). Appendix A. Supplementary data: Supplementary data associated with this article can be found, in the online version, at http://dx.doi.org/10.1016/j. ecolind.2012.04.002.
Uncontrolled Keywords: Genetic diversity, Diversity index, Bread wheat, Genetic erosion, Spatial evenness, Historical dataset
Author Affiliation: UMR de Génétique Végétale, INRA, Univ Paris-Sud, CNRS, Ferme du Moulon, F-91190 Gif-sur-Yvette, France
Subjects: Plant Production
Divisions: General
Depositing User: Mr Siva Shankar
Date Deposited: 08 May 2012 05:01
Last Modified: 08 May 2012 05:01
Official URL: http://dx.doi.org/10.1016/j.ecolind.2012.04.002
URI: http://eprints.icrisat.ac.in/id/eprint/5149

Actions (login required)

View Item View Item