Assessment of Striga resistance in wild relatives of sorghum under field condition
Sažetak
The witch-weeds (Striga spp) are destructive root parasites of many crops. They results in considerable crop damage especially, in the semiarid-tropic parts of the world. The parasite control is difficult due to the complexity of the parasite life cycle, and the large number of seeds produced by the parasite with prolongs viability. The most promising way of controlling the parasite is through the development of the resistant crop cultivars. Identification of different sources of resistance will enhance breeding for resistant varieties. Wild relatives of sorghum are rich with genetic diversity and have a broad genetic base including novel and valuable traits like Striga and disease resistance. In this context, 55 wild sorghum lines were collected from three regions of Sudan including Eastern (Gadaref), Central (Gezira), and Western (North Kordofan).
The collected germplasm was assessed for Striga resistance using artificial infestation. The results showed significant difference in number of Striga emerged plants compared to the checks. Hence, significant difference was showed in number of days to 50% plants to reach flowering, plant height, and grain yield per hectare. The wild relatives were also morphologically characterized and the result showed the 55 lines structured in six groups independently from their geographical regions.
Reference
Barrett, B. A., and Kidwell, K. K. (1998). AFLP-based genetic diversity assessment among wheat cultivars from the Pacific Northwest. Crop Science, 38, 1261–1271.
Deodikar, G.B. (1951). Sorghum versicolor Anderss–a species highly resistant to Striga. Current Science (India), 20,135–136.
Doggett, H. (1988). The Sorghum crop: In Sorghum (2nd ed) (pp 368-404). London: Longman group U.K. Limited.
Ejeta, G., Mohammed, A., Rich, P., Melake-Berhan, A., Housley, TL., Hess, DE. (2000). Selection for specific mechanisms of resistance to Striga in sorghum. In B. Haussmann, DE. Hess, ML. Koyama, L. Grivet, HFW. Rattunde, H. Geiger (eds), Proceedings of Breeding for Striga resistance in cereals workshop (pp 29–37). Ibadan, Nigeria.
Gurney, A. L., Press, M. C, and Scholes, J. D. (2002). Can wild relatives of sorghum provide new sources of resistance or tolerance against Striga species? Weed Science, 42,317–324.
Harlan, J. R., and de Wet, J. M. (1972). A simplified classification of sorghum. Crop Science,12,172-176.
Haussmann, B., Hess, D. E., Omanya, G. O., Folkertsma, R. T., Reddy, B. V. S., Kayentao, M., Welz, H. G., Geiger, H. H.. (2004). Genomic regions influencing resistance to the parasitic weed Striga hermonthica in two recombinant inbred populations of sorghum. Theoretical Applied Genetics, 109, 1005–1016.
Heller, R., Wegmann, K. (2000). Mechanisms of resistance to Striga hermonthica (Del.) Benth in Sorghum bicolor (L.) Moench. In B. Haussmann, DE. Hess, ML. Koyama, L. Grivet, HFW. Rattunde, H. Geiger (eds), Proceedings of Breeding for Striga resistance in cereals workshop (pp 29–37). Ibadan, Nigeria.
Kamala, V., Singh, S. D., Bramel, P. J., Rao, D. M. (2002). Sources of resistance to downy mildew in wild and weedy sorghums. Crop Science, 42,1357–1360.
Khidir, M. O. (1983). Striga research in Sudan. Proceedings of the second Regional Workshop on Sorghum and Millet Improvement in East Africa, Rubona, Rwanda, SAFGRAD/ICRISAT Regional Program (pp. 169-177). Nairobi, Kenya.
Lane, J.A., Moore, T.H.M., Steel, J., Mithen, R.F., and Bailey, J.A.. (1994). Resistance of cowpea and Sorghum germplasm to Striga species. In, A. H. Pieterse et al. (ed), Proceedings of the third workshop on Biology and management of Orabanche and related Striga research (p. 356-364.). Royal Tropical Institute, Amsterdam, Netherlands.
Mohamed, A. H., Ellicott, A., Housley, T. L, and Ejeta G. (2003). Hypersensitive response to Striga infection in Sorghum. Crop Science, 43,1320-1324.
Obilana, A. T. (1983). Striga studies and control in Nigeria. In, K. V. Ramiah and M. J. Rao(eds) proceeding of the second International Striga Workshop (pp 87-89). Ouadougou, Upper Volta.
Parker, C., and Riches, C. R. (1993). Parasitic Weeds of the World: Biology and control. Oxfordshire: Wallingford: CAB International.
Rao, K. N., Reddy, L. J., and Bramel, P. J. (2003). Potential of wild species for genetic enhancement of some semi-arid food crops. Genetic Resources and Crop Evolution, 50,707–721.
Reed, J. D., Ramundo, B. A., Claflin, L. F., and Tuinstra, M. R. (2002). Analysis of resistance to ergot in sorghum and potential alternate hosts. Crop Science, 42,1135–1138.
Rich, P.J., Grenier, U., and Ejeta G. (2004). Striga resistance in the wild relatives of sorghum. Crop Science, 44,2221–2229.