Pathogenic diversity of soybean rust in Argentina, Brazil, and Paraguay

Phakopsora pachyrhizi, the cause of soybean rust, is an economically important pathogen of soybean in South America. Understanding the pathogenicity of indigenous fungal populations is useful for identifying resistant plant genotypes and targeting effective cultivars against certain populations. Fifty-nine rust populations from Argentina, Brazil, and Paraguay were evaluated for pathogenicity in three cropping seasons, 2007/2008–2009/2010, using 16 soybean differentials. Only two pairs of P. pachyrhizi populations displayed identical pathogenicity profiles, indicating substantial pathogenic variation in the rust populations. Comparative analysis of 59 South American and five Japanese samples revealed that pathogenic differences were not only detected within South America but also distinct between the P. pachyrhizi populations from South America and Japan. In addition, seasonal changes in rust pathogenicity were detected during the sampling period. The differentials containing resistance genes (Rpp: resistance to P. p achyrhizi) Rpp1, Rpp2, Rpp3, and Rpp4, except for Plant Introduction (PI) 587880A, displayed a resistant reaction to only 1.8–14, 24–28, 22, and 36 % of South American P. pachyrhizi populations, respectively. In contrast, PI 587880A (Rpp1), Shiranui (Rpp5), and 3 Rpp-unknown differentials (PI 587855, PI 587905, and PI 594767A) showed a resistant reaction to 78–96 % of all populations. This study demonstrated that P. pachyrhizi populations from South America vary geographically and temporally in pathogenicity and that the known Rpp genes other than Rpp1 in PI 587880A and Rpp5 have been less effective against recent pathogen populations in the countries studied.EEA PergaminoFil: Akamatsu, Hajime. Japan International Research Center for Agricultural Sciences (JIRCAS). Biological Resources and Post-harvest Division; JapónFil: Yamanaka, Naoki. Japan International Research Center for Agricultural Sciences (JIRCAS). Biological Resources and Post-harvest Division; JapónFil: Yamaoka, Yuichi. University of Tsukuba. Faculty of Life and Environmental Sciences; JapónFil: Soares, Rafael Moreira. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). National Soybean Research Center (EMBRAPA Soja); BrasilFil: Morel, Wilfrido. Instituto Paraguayo de Tecnología Agraria (IPTA). Research Center of Capitán Miranda (CICM); ParaguayFil: Ivancovich, Antonio Juan. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; ArgentinaFil: Bogado, Alicia Noelia. Instituto Paraguayo de Tecnología Agraria (IPTA). Research Center of Capitán Miranda (CICM); ParaguayFil: Kato, Masayasu. Japan International Research Center for Agricultural Sciences (JIRCAS). Biological Resources and Post-harvest Division; Japón. National Agriculture and Food Research Organization (NARO). Agricultural Research Center (NARO/ARC); JapónFil: Yorinori, José Tadashi. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). National Soybean Research Center (EMBRAPA Soja); Brasil. Tadashi Agro; BrasilFil: Suenaga, Kazuhiro. Japan International Research Center for Agricultural Sciences (JIRCAS). Biological Resources and Post-harvest Division; Japó

BRS 183 Soybean

ABSTRACT BRS 183 is an early maturing soybean cultivar developed by Embrapa Soybean for sowing in Parana State. It flowers and reaches maturity 53 and 118 days after germination and yields 3,038 kg/ha. BRS 183 is resistant to stem canker, frog-eye leaf spot, bacterial pustule and moderately resistant to powdery mildew

CULTIVAR RELEASE-BRS 217 Flora: Early-maturing soybean cultivar

The soybean (Glycine max L. Merr.) cultivar BRS 217 Flora was developed by Embrapa and released forproduction in the states of Goiás, Minas Gerais, Bahia, Mato Grosso and the Distrito Federal, Brazil. It is resistant to stemcanker, frog-eye leaf spot, bacterial pustule, and partially resistant to powdery mildew