Rhizoctonia solani AG 1-IB and AG 4 HG-I causing leaf blight and root rot in plants from the Lamiaceae family in Brazil

• Published in: Tropical plant pathology Vol. 43; no. 2; pp. 152 - 159
• Main Authors: de Melo, Maruzanete P., Cabral, Cléia S., Reis, Ailton, Matos, Kedma S., Martins, Pâmela P., Beserra Júnior, José E. A., Nechet, Kátia L., Halfeld-Vieira, Bernardo A.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-04-2018; Springer Nature B.V
• Subjects: Anastomosis; Basidiospores; Biomedical and Life Sciences; Blight; Fungi; Herbal medicine; Hymenia; Lamiaceae; Leaf blight; Leaves; Life Sciences; Medicinal plants; Mentha spicata; Mycelia; Ocimum basilicum; Pathogens; Phylogeny; Plant Pathology; Plants (botany); Rhizoctonia solani; Root rot; Short Communication; Brazil; Medicinal plants; Basidiomycetes; Root rot; Anastomosis group; Leaf blight
• ISSN: 1983-2052; 1982-5676; 1983-2052
• DOI: 10.1007/s40858-017-0181-1

Rhizoctonia solani
is a fungal complex represented by 14 anastomosis groups. Each group has distinct characteristics that are reflected in the management and control strategies for diseases caused by this fungus. In three distinct geographical regions, plants of the Lamiaceae family from vegetable and medicinal herb gardens were observed, with
Mentha piperina
,
Mentha spicata
and
Origanum manjerona
presenting symptoms of leaf blight and
Ocimum basilicum
,
Ocimum vulgare
and
Rosmarinus officinalis
presenting root rot symptoms. Mycelia, hymenia, basidiospores and microsclerotia were found on the stems and leaves of
Mentha piperina
and
Mentha spicata
. These are typical morphological markers of the genus
Rhizoctonia
. The ITS region was amplified for nine isolates and subsequently sequenced. In the phylogenetic analysis, the isolates were identified as
Rhizoctonia solani
belonging to AG 1-IB and AG 4 HG-I anastomosis groups. All isolates inoculated in their respective hosts caused disease symptoms resembling those typically observed in the field. This is the first report of
R. solani
AG 1-IB in
M. spicata
,
M. piperina
and
Origanum majorana
and of
R. solani
AG 4 HG-I in
O. vulgare
,
R. officinalis
and
O. basilicum
in Brazil.