Diversity for durable yellow rust (Puccinia striiformis West. tritici) resistance in wheat germplasm
2008
Ali, S. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Breeding and Genetics) | Shah, S.J.A. (Nuclear Inst. for Food and Agriculture, Tarnab (Pakistan)) | Rahman, H. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Breeding and Genetics) | Maqbool, K. (COMSATS, Abbottabad (Pakistan)) | Farhatullah
Durable resistance based on partial resistance is an important and effective way to combat the problem of yellow rust (Puccinia striiformis West. tritici). Diversification of the improved cultivars with regard to resistance genes is also important. The present experiment was carried out during 2005-06 to reveal variability for partial resistance to yellow rust among 20 NIA-wheat breeding lines grown at Nuclear Institute for Food and Agriculture, Peshawar, along with `Morocco' as susceptible check. Partial resistance was assessed through the infection type, final rust severity (FRS), area tinder rust progress curve (AURPC), infection rate (IR) and coefficient of infection (CI). Cluster analysis of the 20 wheat lines revealed two main groups/cluster along Morocco us a separate cluster. Based on overall parameters, these lines were grouped into two clusters. Nine lines were grouped in one cluster, while remaining 11 lines were clustered in another group. Similarly, cluster analysis based on partial resistance parameters also resulted in two groups for the tested lines along with Morocco as a separate line. The first cluster included the lines considered as moderately slow yellow rusting lines while those of later group were marked as better slow rusting lines. The present study revealed that the lines were having enough diversity regarding slow rusting behavior and yellow rust resistance, ranging from immunity to partial resistant lines. Based on slow rusting trait, the tested lines are supposed to carry slow yellow rusting genes of varying degrees and can be used for further manipulation in wheat improvement program after confirmatory studies.
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