28
• AvAnces en InvestIgAcIón AgropecuArIA
III Simposio Internacional de Parasitología Agrícola. AIA. 2023. 27(Suplemento 1): 27-28
Issn 0188789-0
Fusarium spp. causando la enfermedad de marchitez... | Fusarium spp. Causing Vascular Wilt Disease...
cuts were made from the samples and they
were superficially disinfected with 2% sodium
hypochlorite and transferred to on potato dex-
trose agar (PDA) medium with PCNB and
antibiotic. Pathogenicity tests were performed
on 45-day-old Capsicum spp. pepper plants
grown in 200-cavity polyethylene trays in an
autoclaved substrate. 60 plants were inocula-
ted by soaking them with 20 mL of a conidial
suspension (1×10
5
CFU/mL) in an isotonic
saline solution grown on PDA. sixty uninocu-
lated plants served as controls. The plants were
kept for 60 days under greenhouse conditions
(25 to 30°C). The test was carried out twice.
Root and stem rot similar to that observed in
infected plants in the field was observed. No
symptoms were observed in uninoculated con-
trol plants after 60 days. The pathogen was
isolated again from the necrotic tissue of all
the inoculated plants and it was identified as
Fusarium falciforme, with the morphological
identification, genetic analysis and pathogeni-
city tests, with which Koch’s postulates were
fulfilled. Results and discussion. Molecular
identification was confirmed by means of NCBI
in BLAST and in the FUSARIUM-ID and
Fusarium MLST databases, finding a 99% si-
milarity with species belonging to the Fusarium
falciforme species complex. This fungus has
been reported to cause chrysanthemum wilt in
Vietnam (Thao et al., 2021). Conclusions.
As far as we know, this is the first report of Fu-
sarium falciforme causing plant wilt in Capsicum
annum cultivars in Mexico. Chili cultivation is
important in Mexico, and the occurrence of this
disease could threaten chili production.
Keywords
Insolation, pathogenicity, morphological iden-
tification.
en Sinaloa, México. Se realizaron pequeños
cortes de las muestras y se desinfestaron super-
ficialmente con hipoclorito de sodio al 2% y se
transfirieron en medio de agar dextrosa de papa
(PDA) con pentacloronitrobenceno (PCNB)
y antibiótico. Las pruebas de patogenicidad se
realizaron en plantas de Capsicum spp. de 45
días de edad cultivadas charolas de polietileno
de 200 cavidades en un sustrato esterilizado en
autoclave. Se inocularon 60 plantas empapán-
dolas con 20 mL de una suspensión de conidios
(1×10
5
UFC/mL) en una solución salina iso-
tónica de cultivada en PDA. Sesenta plantas
sin inocular sirvieron como control. Las plantas
se mantuvieron durante 60 días en condiciones
de invernadero (25 a 30 °C). El ensayo se rea-
lizó dos veces. Se observó pudrición de raíz y
tallo similar a la observada en las plantas infec-
tadas en el campo. No se observaron síntomas
en las plantas de control sin inocular después
de 60 días. Resultados y discusión. El
patógeno se volvió a aislar del tejido necrótico
de todas las plantas inoculadas y se identificó
como Fusarium falciforme, con la identificación
morfológica, análisis genéticos y los ensayos de
patogenicidad con ello se cumplieron los pos-
tulados de Koch. Este hongo se reporta como
causante del marchitamiento del crisantemo en
Vietnam (Thao et al., 2021). Conclusiones.
Este es el primer reporte de Fusarium falciforme
causando marchitez en la planta el cultivares de
Capsicum annuum en México.
Palabras clave
Aislamiento, patogenicidad, identificación,
morfología.
Literatura Citada
Thao, L.D.; Anh, P.T.; Trang, T.T.T.; Khanh, T.N.; Hien, L.T.; Binh, V.T.P.; Thanh, H.M.
y Thanh, D.T. (2021). Fusarium falciforme a pathogen causing wilt disease of chrysanthemum
in Vietnam. New Disease Reports. 43(2): 1-2. https://doi.org/10.1111/ndr2.212013