Development of a pearl millet Striga-resistant genepool: Response to five cycles of recurrent selection under Striga-infested field conditions in West Africa

Kountche, B A and Hash, C T and Dodo, H and Laoualy, O and Sanogo, M D and Timbeli, A T and Vigouroux, Y and This, D and Nijkamp, R and Haussmann, B I G (2013) Development of a pearl millet Striga-resistant genepool: Response to five cycles of recurrent selection under Striga-infested field conditions in West Africa. Field Crops Research, 154. pp. 82-90. ISSN 0378-4290

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Abstract

Striga hermonthica (Del.) Benth. is a persistent threat to pearl millet [Cenchrus americanus (L.) Morrone, comb. nov.] production, especially in West Africa. This study aimed at evaluating the response of a diversified pearl millet genepool to five cycles of recurrent selection targeting Striga resistance and panicle yield, and to a lesser extent downy mildew [Sclerospora graminicola (Sacc.) J. Schroet.] resistance. Two-hundred full-sib families (FS) representing the C5 selection cycle were evaluated together with the genepool parental landraces, experimental varieties derived from previous cycles and local checks in Striga-infested fields at Sadoré (Niger) and Cinzana (Mali). Substantial and mostly significant selection progress could be documented. The accumulated percentage gain from selection amounted to 51%/1% lower Striga infestation (measured by area under Striga number progress curve, ASNPC), 46%/62% lower downy mildew incidence, and 49%/31% higher panicle yield of the C5-FS compared to the mean of the genepool parents at Sadoré/Cinzana, respectively. Experimental varieties selected from previous cycles also revealed lower ASNPC and mostly higher yield compared to genepool parents at their selection sites. Significant genetic variation among the C5-FS and operative heritabilities of 76% (Cinzana), 84% (Sadoré) and 34% (combined across locations) for ASNPC will enable continued selection gain for Striga resistance. High genotype × environment interaction variances for all target traits suggest that different experimental varieties need to be extracted from the genepool for different sites. The genepool-derived varieties will be further validated on-farm and are expected to contribute to integrated Striga control in pearl millet in West Africa.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Subjects: Mandate crops > Millets
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 24 Aug 2013 07:53
Last Modified: 14 Nov 2017 06:02
URI: http://oar.icrisat.org/id/eprint/7064
Official URL: http://dx.doi.org/10.1016/j.fcr.2013.07.008
Projects: CGIAR Research Program on Dryland Cereals
Funders: McKnight Foundation , IRD-DSF
Acknowledgement: This work has been undertaken as part of the CGIAR Research Program on DrylandCereals. The financial support of the McKnight Foundation is gratefully acknowledged (ICRISAT grants no. 06-14 and 10-134). This research was conducted at ICRISAT-Sadoré and IER-Cinzana; the authors express their appreciation to Boubé Guida, Hamadou Boubé, Adama Traoré and all other field assistants at Sadoré and Cinzana for their great help with the experiments. Our grateful thanks are extended to Dr. Roger Stern and Zobinou Mawusi (Reading University, UK) for their valuable statistical assistance, and to the resource persons of the e-writeshop organized by the Collaborative Crop Research Program of the McKnight Foundation. Finally, this publication was made possible through support provided by the IRD-DSF to the first author.
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