Identification of new Bremia lactucae races in lettuce in São Paulo state

Horticultura Brasileira

Renata Castoldi²  Hamilton César De O Charlo¹  Tagli Dalpian¹  Danilo M Melo²  Adelita P Botelho²  Leila T Braz² 

[1] ,UNESP FCAV Depto Produção VegetalJaboticabal SP

关键词: Lactuca sativa L;    genes DM;    downy mildew;    resistance;    Lactuca sativa;    genes DM;    míldio;    resistência;   

DOI  :  10.1590/S0102-05362012000200005

来源: SciELO

【 摘 要 】

Lettuce is the most consumed leafy vegetable in Brazil. However, its production has faced increasing difficulties mainly due to the infestation of producing areas with Bremia lactucae, the causing agent of downy mildew, the worst disease in lettuce. The aim of this study was to identify B. lactucae races occurring in lettuce producing areas of São Paulo state, during 2008 and 2009. Lettuce leaf samples containing B. lactucae sporangia were collected in the major lettuce producing areas of São Paulo. Each sample was considered an isolate. After the multiplication of sporangia in the susceptible cultivar Solaris, with subsequent inoculation in the differentiating cultivars, the evaluations were performed on the same day of the first sporulation in the susceptible cultivar 'Cobham Green (DM 0)'. In 2008 one new B. lactucae code was identified. SPBl:05 was the denomination proposed to it. In 2009 one another B. lactucae code was identified, that is, 63/63/02/00, whose denomination was proposed to be SPBl:06.

【 授权许可】

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