TY - JOUR
T1 - Evaluation of soybean genotypes for resistance against the rust-causing fungus Phakopsora pachyrhizi in East Africa
AU - Murithi, Harun Muthuri
AU - Namara, Mercy
AU - Tamba, Mussa
AU - Tukamuhabwa, Phinehas
AU - Mahuku, George
AU - van Esse, H. Peter
AU - Thomma, Bart P. H. J.
AU - Joosten, Matthieu H. A. J.
N1 - Data Availability Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgements: We acknowledge AVRDC, also known as World Vegetable Center (WorldVeg), that provided some of the soybean materials. This research was funded by the International Institute of Tropical Agriculture (IITA), by a Lukas Brader Scholarship Award and by the 2Blades Foundation at The Sainsbury Laboratory, Norwich, UK.
PY - 2021/5
Y1 - 2021/5
N2 - 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.
AB - 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.
KW - infection types
KW - Phakopsora pachyrhizi
KW - resistance
KW - soybean genotypes
KW - susceptibility
UR - http://www.scopus.com/inward/record.url?scp=85100518459&partnerID=8YFLogxK
U2 - 10.1111/ppa.13339
DO - 10.1111/ppa.13339
M3 - Article
AN - SCOPUS:85100518459
VL - 70
SP - 841
EP - 852
JO - Plant Pathology
JF - Plant Pathology
SN - 0032-0862
IS - 4
ER -