Khoury, C K and Castañeda-Alvarez, N P and Achicanoy, H A and Sosa, C C and Bernau, V and Kassa, M T and Norton, S L and Van Der Maesen, L J G and Upadhyaya, H D and Ramírez-Villegas, J and Jarvis, A and Struik, P C (2015) Crop wild relatives of pigeonpea [Cajanus cajan (L.) Millsp.]: Distributions, ex situ conservation status, and potential genetic resources for abiotic stress tolerance. Biological Conservation, 184. pp. 259-270. ISSN 0006-3207
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Abstract
Pigeonpea [Cajanus cajan (L.) Millsp.] is a versatile, stress-tolerant, and nutritious grain legume, possessing traits of value for enhancing the sustainability of dry sub-tropical and tropical agricultural systems. The use of crop wild relatives (CWR) in pigeonpea breeding has been successful in providing important resistance, quality, and breeding efficiency traits to the crop. Current breeding objectives for pigeonpea include increasing its tolerance to abiotic stresses, including heat, cold, drought, and waterlogging. Here we assess the potential for pigeonpea CWR to be further employed in crop improvement by compiling wild species occurrence and ex situ conservation information, producing geographic distribution models for the species, identifying gaps in the comprehensiveness of current germplasm collections, and using ecogeographic information to identify CWR populations with the potential to contribute agronomic traits of priority to breeders. The fifteen prioritized relatives of pigeonpea generally occur in South and Southeast Asia to Australia, with the highest concentrations of species in southern India and northern Australia. These taxa differ considerably among themselves and in comparison to the crop in their adaptations to temperature, precipitation and edaphic conditions. We find that these wild genetic resources are broadly under-represented in ex situ conservation systems, with 80% of species assessed as high priority for further collecting, thus their availability to plant breeders is insufficient. We identify species and highlight geographic locations for further collecting in order to improve the completeness of pigeonpea CWR germplasm collections, with particular emphasis on potential traits for abiotic stress tolerance.
| Item Type: | Article |
|---|---|
| Divisions: | RP-Grain Legumes |
| CRP: | CGIAR Research Program on Grain Legumes |
| Uncontrolled Keywords: | Crop diversity, Crop improvement, Crop wild relatives Food security, Germplasm conservation, Plant genetic resources |
| Subjects: | Mandate crops > Pigeonpea Others > Genetics and Genomics |
| Depositing User: | Mr B K Murthy |
| Date Deposited: | 13 Mar 2015 10:43 |
| Last Modified: | 19 Aug 2016 03:50 |
| URI: | http://oar.icrisat.org/id/eprint/8483 |
| Official URL: | http://dx.doi.org/10.1016/j.biocon.2015.01.032 |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | We thank the taxonomic and geographic data providers whose contributions made this analysis possible, Flora Mer for data gathering for pigeonpea and other pulses’ growing condition requirements, and Steven Prager for comments. Data collation and analyses were undertaken as part of the initiative “Adapting Agriculture to Climate Change: Collecting, Protecting and Preparing Crop Wild Relatives” which is supported by the Government of Norway. The project is managed by the Global Crop Diversity Trust with the Millennium Seed Bank of the Royal Botanic Gardens, Kew, UK, and implemented in partnership with national and international genebanks and plant breeding institutes around the world. |
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