Mycelial compatibility and aggressiveness of Sclerotinia sclerotiorum isolates from Brazil and the United States

Pesquisa Agropecuária Brasileira

Lucimara Junko Koga¹  Charles Roger Bowen¹  Claudia Vieira Godoy¹  Maria Cristina Neves De Oliveira¹  Glen Lee Hartman¹ 

关键词: Glycine max;    Sclerotinia stem rot;    disease resistance;    screening of cultivars;    white mold;    Glycine max;    podridão-de-esclerotinia;    resistência a doenças;    seleção de cultivares;    mofo-branco;   

DOI  :  10.1590/S0100-204X2014000400004

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the genetic diversity among Sclerotinia sclerotiorum isolates from Brazil and the USA, assess their aggressiveness variability, and verify the existence of an isolate-cultivar interaction. Isolate variability was determined by mycelial compatibility grouping (MCG), and isolate aggressiveness by cut-stem inoculations of soybean cultivars. Two experiments for MCGs and two for aggressiveness were conducted with two sets of isolates. The first set included nine isolates from the same soybean field in Brazil and nine from the Midwest region of the USA. The second set included 16 isolates from several regions of Brazil and one from the USA. In the first set, 18 isolates formed 12 different MCGs. In the second set, 81% of the isolates from Brazil grouped into a single MCG. No common MCGs were observed among isolates from Brazil and the USA. The isolates showed aggressiveness differences in the first set, but not in the second. Although aggressiveness differed in the first set, soybean cultivars and isolates did not interact significantly. Cultivar rank remained the same, regardless of the genetic diversity, aggressiveness difference, and region or country of origin of the isolate. Results from screening of soybean cultivars, performed by the cut-stem method in the USA, can be used as reference for researchers in Brazil.

【 授权许可】

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