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Evaluation of soybean genotypes for resistance against the rust‐causing fungus Phakopsora pachyrhizi in East Africa
Author(s) -
Murithi Harun Muthuri,
Namara Mercy,
Tamba Mussa,
Tukamuhabwa Phinehas,
Mahuku George,
van Esse H. Peter,
Thomma Bart P. H. J.,
Joosten Matthieu H. A. J.
Publication year - 2021
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/ppa.13339
Subject(s) - phakopsora pachyrhizi , soybean rust , biology , rust (programming language) , genotype , spore , fungus , basidiomycota , urediniospore , cultivar , plant disease resistance , agronomy , resistance (ecology) , veterinary medicine , horticulture , botany , gene , genetics , fungicide , medicine , computer science , programming language
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.