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Defesa Fitossanitária • Rev. Bras. Frutic. 38 (3) • 2016 • https://doi.org/10.1590/0100-29452016048   copy

FIRST REPORT OF Phytophthora nicotianae CAUSING ROOT ROT OF SOURSOP IN NORTHEASTERN BRAZIL

PRIMEIRO RELATO DE Phytophthora nicotianae CAUSANDO PODRIDÃO EM RAÍZES DE GRAVIOLEIRA NO NORDESTE DO BRASIL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In 2013, soursop trees showing symptoms of root rot were observed in a field in Maceió, state of Alagoas, Brazil. It was isolated Phytophthora sp. which pathogenicity was confirmed in the host seedlings. Morphological and physiological characteristics in carrot-agar modified medium were consistent with Phytophthora nicotianae description. The PCR sequences products obtained with ITS1/ITS4 primers were compared to sequences of ribosomal DNA of Phytophthora species from the GenBank database observing high identity with other P. nicotianae isolates. A phylogenetic tree was performed to compare the isolate with other sequences of P. nicotianae, which clustering has been verified with 99% of bootstrap, confirming the morphophysiological studies. This is the first report of this pathogen on annonaceous plants in the Northeastern Brazil.

Index terms
Annona muricata; Phytophthora wilt; Oomycete; etiology

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