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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Identification and pathogenicity ofNeophysopellaspecies associated with Asian grapevine leaf rust in Brazil

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Santos, Ricardo F. [1] ; Primiano, V, Isabela ; Amorim, Lilian [2]
Total Authors: 3
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Dept Plant Pathol & Nematol, BR-13418900 Piracicaba, SP - Brazil
[2] Primiano, Isabela, V, Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Dept Plant Pathol & Nematol, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: PLANT PATHOLOGY; v. 70, n. 1, p. 74-86, JAN 2021.
Web of Science Citations: 0

Asian grapevine leaf rust (AGLR) causes severe crop losses in Brazilian viticulture, mainly in latitudes <25 degrees S. The purpose of this study was to identify the pathogen(s) involved with AGLR in Brazil, based on phylogenetic and morphological analysis and pathogenicity tests. In total, 56 monouredinial isolates from six Brazilian states were identified using the internal transcribed spacer 2 and the large subunit rRNA gene D1/D2 regions. All 50 isolates from the south-central region were classified asNeophysopella tropicalis, and the other six isolates from the north-east region asNeophysopella meliosmae-myrianthae. This result provides evidence that two pathogen introductions from different sources may have occurred in the country. For both species, paraphyses were cylindrical, incurved, aseptate, and hyaline, while urediniospores were short-pedicellate, obovoid or obovoid-ellipsoid, with the wall colourless or pale yellowish, evenly echinulate. Representative isolates from both species caused typical AGLR symptoms onVitis vinifera'Merlot' andV.labrusca'Niagara Rosada'. Overall, regardless of theNeophysopellaspecies, isolates caused similar leaf disease severities. Higher disease severity was observed in Niagara Rosada (average of 40.3% of diseased leaf area) compared to Merlot (20.5%). This study reports, for the first time, the characterization ofNeophysopellaspecies associated with AGLR in Brazil. (AU)

FAPESP's process: 15/26108-8 - Aggressiveness of Phakopsora: a comparative analysis of grapevine and soybean rusts with emphasis to histopathology and epidemiology
Grantee:Isabela Vescove Primiano
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/24003-9 - Grape diseases: epidemiology, damage assessment and control
Grantee:Lilian Amorim
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/21412-6 - Population structure and sensitivity of Plasmopara viticola and Phakopsora euvitis to fungicides in Brazil
Grantee:Ricardo Feliciano dos Santos
Support type: Scholarships in Brazil - Post-Doctorate