Inheritance of stem rust (Puccinia graminis Pers. F. Sp. Tritici ericks and E. Hen) resistance in bread wheat (Triticum aestivum L.) Lines to TTKST race

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Research Paper 01/10/2015
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Inheritance of stem rust (Puccinia graminis Pers. F. Sp. Tritici ericks and E. Hen) resistance in bread wheat (Triticum aestivum L.) Lines to TTKST race

Zennah Kosgey, James O. Owuoche, Michael A. Okiror, Peter N. Njau
Int. J. Agron. Agri. Res.7( 4), 1-13, October 2015.
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Stem rust disease caused by Puccinia graminis f.sp. tritici (Pgt) is currently one of the major biotic constraints in wheat (Triticum aestivum) production worldwide. Therefore, objectives of this study were (i) to identify resistant wheat lines with both adult plant resistance (APR) and seedling plant resistance (SPR), and (ii) to determine the kind of resistance to stem rust in KSL18, PCB52, PCB62 and PCB76 wheat lines. A collection of 100 wheat lines was evaluated in the field and greenhouse for stem rust resistance. The following four lines- KSL18, PCB52, PCB62 and PCB76 were identified as resistant and were crossed with known susceptible cultivars Kwale and Duma. The resulting F1 hybrids and F2 populations alongside the parents were then tested in the greenhouse for response to the stem rust race TTKST. The selected wheat lines exhibited infection types ‘;’ to ‘2’ depicting resistance while Kwale and Duma depicted infection type ‘3+’ to TTKST. In the F2 populations evaluations that derived from Kwale × PCB52 indicated that the resistance is conferred by a single dominant gene. However, all other F2 populations showed that the resistance was conferred by two genes complementing each other (duplicate recessive epistasis) thus the ratios 9R: 7S. These identified resistant lines could be evaluated for other qualities and passed as potential varieties or used as sources of valuable stem rust resistance.


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