Race Analysis of Stem Rust Inoculum and its Virulence on Commercial Wheat Varieties at Seedling in Kari-Njoro, Kenya
Keywords:wheat, Stem rust, Puccinia graminis pers. f. sp. tritici, Triticum aestivum L. Ug99 stem race
Stem rust (Puccinia graminis pers. f. sp. tritici) is one of important foliar diseases of an economic importance in wheat (Triticum aestivum L.) worldwide. Commercial varieties are valuable genetic resource for wheat improvement. The objective of this study was to determine stem rust race in Narok and the seedling resistance of commercial wheat varieties to stem rust race from Narok. In this experiment, five sets of stem rust differential from CIMMYT were inoculated with stem rust inoculums from Narok North District, Kenya. There were different infection types as far as stem rust virulence is concerned on the commercial varieties and the stem rust differentials. From the five sets of differentials, the inoculums from Narok were found to be TTKST (Ug99+Sr24). Twenty commercial wheat varieties were evaluated for resistance to stem rust race Ug99 in three replicates in the green house. The infection type ranged between â€œ0â€ to â€œ4â€ with 55% of the genotypes showing resistance which could be considered for improvement of wheat varieties. About 45% of the genotype was susceptible to Ug99 suggesting elusiveness of resistant gene for stem rust. Kingbird and robin were among the resistant varieties indication of having resistant genes. Farmers need to adopt the new varieties such as kingbird and robin for better yield.
Bonman, J.M., Boeckelman, H.E., Jin, Y. R., Hijmans, J and Gironella, A.I.N. Geographical distribution of stem rust resistance in wheat landraces. Crop Science, 47: 1955-1963, 2007.
Bansal, U.K., Singh, D., Miah, H., Park, R.F and Bariana, H.S: Revisiting old landraces of wheat for rust resistance. In 11th wheat genetic symposium proceedings. The University of Sydney. Sydny University Press, 2008, pp. 186-190.
CIMMYT. Effects of a new race on wheat production / use of fungicides and its cost in large verses small scale farmers, situation of current cultivars. Kenya Agricultural Research Institute. Njoro, pp. 1- 102,
Jin, Y., and Singh, R. P. Resistance in U.S. wheat to recent eastern African isolates of Pucciniagraminis , f. sp. tritici with virulence to resistance gene Sr31. Plant Dis. 90:476-480, 2006.
Meinel A and Unger O: Breeding aspects of partial resistance to airborne pathogens in wheat. Czech. Journal Genet. Plant Breed. 34: 103â€“106, 1998.
Park, R.F. Stem rust of wheat in Australia. Australian Journal Agric. Res 58: 558-566, 2007.
Pretorius, Z.A., Singh, R.P., Wagoire, W.W and Payne, T.S. Detection of virulence to wheat stem rust resistance gene Sr31 in Puccinia graminis f. sp. tritici in Uganda. Plant Disease 84:203, 2000.
Rajaram S, Simmonds NW Singh RP and Torres E: Breeding strategies for resistance to rust of wheat. CIMMYT, Mexico, D.F., pp101-118, 1988.
Rodriguez RJ, Henson J, Van Volkenburgh E, Hoy M, Wright L, Beckwith F, Kim Y and Redman RS. Stress tolerance in plants via habitat-adapted symbiosis. International Society of Microbial Ecology 2: 404â€“416, 2008.
Roelfs, A. P., Singh, R. P and Saari, E. E. Rust Diseases of Wheat: Concepts and Methods of Disease Management. Mexico, DF: CIMMYT, 2008.
Singh, R.P., Hodson, D.P., Huerta-Espino, J., Jin, Y., Njau, P., Wanyera, R., Herrera-Foessel, S.A and Ward, R.W. Will stem rust destroy the worldâ€™s wheat crop? Adv Agron 98:271â€“309, 2008.
Singh, R.P, Hodson, D.P, Huerta-Espino, J. Jin, Y. Bhavani, S. Njau, P. Herrera-Foessel, S. Singh, P.K, Singh, S. and Singh V.G . The emergence of Ug99 races of the stem rust fungus is a threat to world wheat production. Annu Rev Phytopathol DOI 10.1146 / annurevphyto-072910-095423, 2011.
How to Cite
- Papers must be submitted on the understanding that they have not been published elsewhere (except in the form of an abstract or as part of a published lecture, review, or thesis) and are not currently under consideration by another journal published by any other publisher.
- It is also the authors responsibility to ensure that the articles emanating from a particular source are submitted with the necessary approval.
- The authors warrant that the paper is original and that he/she is the author of the paper, except for material that is clearly identified as to its original source, with permission notices from the copyright owners where required.
- The authors ensure that all the references carefully and they are accurate in the text as well as in the list of references (and vice versa).
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Attribution-NonCommercial 4.0 International that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
- The journal/publisher is not responsible for subsequent uses of the work. It is the author's responsibility to bring an infringement action if so desired by the author.