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Etiology and pathogenicity of two different isolates of Colletotrichum spp. obtained from physic nut seeds

Etiologia e patogenicidade de dois diferentes isolados de Colletotrichum spp. obtidos de sementes de pinhão manso

Abstracts

The species known as physic nut (Jatropha curcas L.) has become important as one of main sources of feedstock for biodiesel production. The aims of this study were characterizing two different isolates of Colletotrichum spp. obtained from seeds of this species, through morphological, cultural, and molecular analyses; as well as assessing pathogenicity of both isolates on leaves and fruit of this plant species. For morphological analysis, length and width of 30 spores of each isolate, produced on medium Malt Extract-Agar (MEA), at 25 ± 1 ºC, and under constant light, were measured. Cultural analysis was performed by the fungus growth on PDA medium, through daily measurements of the mycelial growth, and the color of colonies after seven days incubation. DNA of the isolates was extracted and specific oligonucleotides primers (region ITS4) were identified by PCR and used to identify C. capsici (CcInt) and C. gloeosporioides (CgInt). Pathogenicity of isolates was assessed on plants aged 10, 20, 30, 40, 50, and 60 days after sowing and fruits at six maturation stages. Based on these analyses, isolates were identified as C. gloeosporioides and C. capsici. Young plants and the older fruits were more susceptible to infection by the two fungus species.

anthracnose; Jatropha curcas; C. capsici; C. gloeosporioides


A espécie pinhão manso (Jatropha curcas L.), vem se destacando como a principal matéria-prima para produção de biodiesel. O objetivo deste estudo foi caracterizar dois isolados de Colletotrichum spp., obtidos de sementes dessa espécie, através de análise morfológica, cultural e molecular, além de avaliar a patogenicidade desses isolados em folhas e frutos da planta. Para análise morfológica foram medidos o comprimento e a largura de 30 esporos de cada isolado, produzidos em meio de cultura Extrato de Malte-Agar, a 25±1 ºC, sob luz contínua. A análise cultural foi realizada pelo crescimento do fungo em meio de BDA, com avaliações diárias do crescimento do micélio e pela coloração da colônia, após sete dias de incubação. O DNA dos isolados foi extraído e oligonucleotídeos específicos (região ITS4) foram identificados pela técnica de PCR e utilizados para identificar C. capsici (CcInt) e C. gloeosporioides (CgInt). A patogenicidade dos isolados foi avaliada em plantas com diferentes idades (10, 20, 30, 40, 50 e 60 dias após semeadura) e em frutos em seis estádios de maturação. Com base nestas análises os isolados foram identificados como C. capsici e C. gloeosporioides. Plantas jovens e frutos desenvolvidos foram mais suscetíveis à infecção pelas duas espécies do fungo.

antracnose; Jatropha curcas; C. capsici; C. gloeosporioides


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Publication Dates

  • Publication in this collection
    24 June 2013
  • Date of issue
    2013

History

  • Received
    16 Feb 2012
  • Accepted
    23 Oct 2012
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