Registration of Three Soybean Germplasm Lines Resistant to Phakopsora pachyrhizi (Soybean Rust)

Abstract

Soybean rust, caused by Phakopsora pachyrhizi Sydow, is one of the most important foliar diseases of soybean [Glycine max (L.) Merr.]. Development of rust‐resistant lines is one objective of many soybean breeding programs. Three soybean germplasm lines designated as TGx 1987–76F (Reg. No. GP‐369, PI 657702), TGx 1987–118F (Reg. No. GP‐370, PI 657703), and TGx 1987–129F (Reg. No. GP‐368, PI 657701) with resistance to P. pachyrhizi and to Xanthomonas axonopodis pv. glycines (Nakano) Vauterin, Hoste, Kersters & Swings (bacterial pustule) were selected from lines developed by the International Institute of Tropical Agriculture (IITA) in collaboration with the USDA‐ARS at the University of Illinois. These lines were derived from a tropical soybean rust‐resistant cultivar UG5, and a rust‐susceptible, high‐yielding elite breeding line, TGx 1805–31F. A total of 297 F7 lines were evaluated for rust resistance under greenhouse conditions using whole inoculated plants, in the laboratory using detached leaves, and under field conditions in Nigeria and Alabama (287 lines). Based on assessments from these various tests, these three lines have combinations of high levels of rust and bacterial pustule resistance, good agronomic traits, and adaptable maturity to the southern U.S. soybean breeding programs. Breeders will find the three lines useful as rust‐resistant parental material in rust‐prone areas.

Unravelling the diversity and distribution of the soybean rust fungus Phakopsora pachyrhizi in East Africa

“…The cultivar has been reported to consistently confer resistance against soybean rust in Nigeria , the United States , and Uganda . Cultivar UG5 has been deployed in breeding programs in Nigeria and Uganda (Paul et al, 2010;) and appears to be effective as was observed among the African isolates in our study. Despite its effectiveness, isolates from Argentina induced susceptible reactions on this cultivar, suggesting the presence of a more virulent population in South America.…”

Mapping and confirmation of two genes conferring resistance to soybean rust (Phakopsora pachyrhizi) in the soybean line UG‐5 (Glycine max)

“…SBR‐resistant breeding lines have been developed in the United States (Boerma et al, 2011; Diers et al, 2014; King et al, 2016b; Paul et al, 2010). It is thought that more durable and broader resistance can be achieved by pyramiding two or more Rpp genes (Childs et al 2018a; Yamanaka & Houssain, 2019).…”

From Select Agent to an Established Pathogen: The Response to Phakopsora pachyrhizi (Soybean Rust) in North America

“…With the discovery of soybean rust in the United States in 2004, more effort was placed on field screening of PIs and genetic studies in the United States. These evaluations led to the development and release of soybean rustresistant germplasm Diers et al 2013;Paul et al 2010). Although there are no commercially available soybean cultivars with soybean rust resistance in the United States, these early releases and breeding lines that are being evaluated will lead to cultivar releases in the near future, including some with at least two Rpp genes.…”