Molecular Breeding for Striga Resistance in Sorghum

Deshpande, S P and Mohamed, A and Hash, C T (2013) Molecular Breeding for Striga Resistance in Sorghum. In: Translational Genomics for Crop Breeding: Biotic Stress. Wiley Blackwell, pp. 77-93. ISBN 978-0-470-96290-9

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Abstract

Among the biotic stresses affecting dryland cereals, especially sorghum, Striga hermonthica is the most damaging obligate parasite, and is an important bottleneck to yield increases by smallholder farmers, yet it has been neglected by research in recent years. Integrated Striga management packages have been designed, but these will continue to require new cultural and chemical treatments, resistant varieties, and integrated approaches to manage both Striga and soil fertility. This review attempts to assess recent advances in bioassay development that are specific to resistance mechanisms, genomics such as New Generation Sequencing tools, RNA interference (RNAi) technologies in advancing knowledge of resistance and susceptibility to Striga including diversity in striga populations, and molecular marker technology in accelerating the development of Smga-resistant cultivars of sorghum. Recent advances in developing effective bioassays involving several modifications of rhizotrons and sand-packed titer plate assay will help dissect resistance mechanisms into component traits and increased understanding of the specific resistance mechanisms, which will directly help in efficient introgression and selection of several striga resistance mechanisms in breeding population. The current studies for identification of parasite genes specifically involved in haustorigenesis through transcriptomic and/or prote'omic studies and more recently RNAseq studies will help understand susceptibility or resistance genes in striga. Release of improved version of cultivars resistant to striga developed by marker-assisted backcrossing of several striga resistance QTLs in Sudan had shown the power of integrating genomics and molecular breeding tools/techniques into routine breeding for tackling the complex constraint such as striga. Application and utilization of advance techniques in genomics and molecular breeding appropriately can further enhance the efficiency of integrated striga management practices, and thus crop productivity.

Item Type: Book Section
Divisions: RP-Dryland Cereals
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Molecular Breeding, Striga Resistance, Sorghum
Subjects: Mandate crops > Sorghum
Depositing User: Mr Siva Shankar
Date Deposited: 05 Mar 2014 10:13
Last Modified: 19 Oct 2016 08:32
URI: http://oar.icrisat.org/id/eprint/7591
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