University of Khartoum

Dossier Application for Release of Four Striga Resistant Sorghum Varieties

Dossier Application for Release of Four Striga Resistant Sorghum Varieties

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Title: Dossier Application for Release of Four Striga Resistant Sorghum Varieties
Author: Mohamed, Abdalla; Ali, Rasha; Gamar, Y.; Mugoya, C.; Masiga, C.; Deshpande, S.; Abu-Assar, A.; Elhassan, O.; Elhussein, Adil A.; Kiambi, D.; Suliman, E.; Elsadig, I.; T.Hash, C.
Abstract: Striga hermonthica (Del) Benth is the major biotic constraint to sorghum production. It's control is difficult and can only be achieved through integrated management strategies, that depends mainly on host plant resistance. However, breeding for resistance is hampered by the complexity of host parasite interactions and lack of reliable screening methods. The invention of molecular markers has enhanced the effectiveness of breeding for resistance, where five genomic regions (QTLs) with linked markers associated with Striga resistance were mapped in sorghum variety N13. To increase the efficiency of marker assisted selection (MAS), 27 EST-SSR markers and DArTs in close association with Striga resistance QTLs were also identified and mapped. Populations of backcross (BC3S4) derived from N13 (Striga resistant) X three farmer preferred sorghum cultivars; Tabat, Wad Ahmed and AG-8 (Striga susceptible) were generated. Thirty one lines (BC3S4) with confirmed Striga field resistance were genotyped with foreground and background selection makers. Resistant lines, 20, with two or more major QTLs were selected for regional evaluation. In Sudan, 10 of these lines were selected and advanced for multi-location testing, together with Wad-Ahmed, Tabat, AG8, N13, SRN39 and IS9830 as checks. Standard variety trials were carried in Striga sick plots over three seasons (2009 - 2011) in Gezira Research Station (GRS), Damazine, Sinnar, and Gedaref. Results revealed that lines, T1BC3S4, AG6BC3S4, AG2BC3S4 and W2BC3S4 were Striga resistant and agronomically superior, 298%- 180% increase in yield over the recurrent parents. This Striga resistance coupled with the very high yield potentials, high grain quality and drought resistance harness their adaptation and stability across a wide range of environments. The research team is convinced beyond a reasonable doubt that the results presented in this dossier are sufficient to make a good case for the release of the four varieties.
URI: http://khartoumspace.uofk.edu/123456789/27735


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