Plant Pathology (2021) 70, 841-852

Harun Muthuri Murithi, Mercy Namara, Mussa Tamba, Phinehas Tukamuhabwa, George Mahuku, H. Peter van Esse, Bart P.H.J. Thomma and Matthieu H.A.J. Joosten (2021)
Evaluation of soybean genotypes for resistance against the rust-causing fungus Phakopsora pachyrhizi in East Africa
Plant Pathology 70 (4), 841-852
Abstract: Soybean rust, caused by the biotrophic fungus Phakopsora pachyrhizi, is the most important foliar disease of soybean (Glycine max) worldwide. Deployment of resistant soybean cultivars is the best option for managing this disease. Genes conferring resistance to P. pachyrhizi have been identified, but pathotypes of the rust fungus overcoming these resistance genes have also been found. To identify novel resistance genes, soybean genotypes from both local and international sources were screened at multiple locations in Tanzania and Uganda in 2016 and 2017. The results from this screening revealed that infection types, disease severities, and sporulation levels varied among the genotypes and locations. The majority of the genotypes had tan-coloured (TAN) lesions and developed moderate sporulation, implying susceptibility, while only seven of the 71 lines had reddish-brown (RB) lesions and showed low disease severities in all of the screening environments. We identified seven genotypes that were the most resistant to rust in the most locations over the two years. These genotypes will be useful for further studies and, ultimately, for rust management, as they show broad resistance to various pathotypes of the rust fungus.
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Database assignments for author(s): Harun Murithi, George S. Mahuku, Bart P.H.J. Thomma, Matthieu H. A. J. Joosten

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phakopsora pachyrhizi	Soybean (Glycine max)	Tanzania
	Phakopsora pachyrhizi	Soybean (Glycine max)	Uganda