ISSN 2756-3847
International Journal of Plant Breeding and Genetics ISSN 5756-2148 Vol. 4 (4), pp. 265-270, April, 2017. © International Scholars Journals
Full Length Research Paper
Resistance in Kenyan bread wheat to recent eastern African isolate of stem rust, Puccinia graminis f. sp. tritici, Ug99
P. N. Njau1*, R. Wanyera1, G. K. Macharia1, J. Macharia2, R. Singh3 and B. Keller4
1Kenya Agricultural Research Institute (KARI) Njoro, Kenya.
2Egerton University Njoro. P. O. Box 536 Njoro, Kenya.
3CIMMYT Mexico. Apdo - Postal 6-641, 06000 Mexico, DF.
4Institute of Plant Biology, University of Zurich, Switzerland
*Corresponding author. E mail: [email protected]. Tel.: 073 3775229, 5161576.
Accepted 31 March, 2009
Abstract
Stem or black rust, caused by Puccinia graminis, has historically caused severe losses to wheat (Triticum aestivum) production worldwide. The causal race, commonly known as Ug99 and designated as TTKS based on the North American nomenclature, carries virulence for several genes commonly present in wheat germplasm. All Kenyan germplasm are known to be susceptible or partially susceptible to Ug99 although no proper documentation has been done. This study was aimed at evaluating the Kenyan bread wheat varieties on their response to Ug99. The varieties were screened for resistance at seedling stage and adult plant resistance stage. None of the varieties apart from Bonny were resistant at seedling stage. Some old Kenyan varieties were found to have adult plant resistance probably due to the presence of non-race specific gene Sr2 complex which among others can be exploited in breeding for resistance in Kenyan wheat.
Key words: Race specific resistance, adult plant resistance, genetic erosion.