6 research outputs found
Phylogenetic analysis of Tomato spotted wilt virus (TSWV) NSs protein demonstrates the isolated emergence of resistance-breaking strains in pepper
Resurgence of
Tomato spotted wilt virus
(TSWV) worldwide as well as in Hungary causing heavy
economic losses directed the attention to the factors con-
tributing to the outbreak of this serious epidemics. The
introgression of
Tsw
resistance gene into various pepper
cultivars seemed to solve TSWV control, but widely used
resistant pepper cultivars bearing the same, unique resis-
tance locus evoked the rapid emergence of resistance-
breaking (RB) TSWV strains. In Hungary, the sporadic
appearance of RB strains in pepper-producing region was
first observed in 2010–2011, but in 2012 it was detected
frequently. Previously, the non-structural protein (NSs)
encoded by small RNA (S RNA) of TSWV was verified as
the avirulence factor for
Tsw
resistance, therefore we
analyzed the S RNA of the Hungarian RB and wild type
(WT) isolates and compared to previously analyzed TSWV
strains with RB properties from different geographical
origins. Phylogenetic analysis demonstrated that the dif-
ferent RB strains had the closest relationship with the local
WT isolates and there is no conserved mutation present in
all the NSs genes of RB isolates from different geograph-
ical origins. According to these results, we concluded that
the RB isolates evolved separately in geographic point of
view, and also according to the RB mechanism
Phylogenetic analysis of Tomato spotted wilt virus (TSWV) NSs protein demonstrates the isolated emergence of resistance-breaking strains in pepper
A rezisztenciát áttörĹ‘ paradicsom foltos hervadás vĂrus (Tomato spotted wilt virus) izolátumok rĂ©szleges molekuláris jellemzĂ©se
Hazánkban a paradicsom foltos hervadás vĂrus (Tomato spotted wilt virus, TSWV) az 1990-es
Ă©vek közepĂ©n vált jelentĂ´s kĂłrokozĂłvá. Ebben döntĂ´ szerepet játszott a vĂrus hatĂ©kony vektorának,
a nyugati virág tripsznek (Frankliniella occidentalis) a Magyarországra történô behurcolása. A
betegsĂ©g elleni vĂ©dekezĂ©s eleinte a vektor ellen irányult, majd kĂ©sĂ´bb a nemesĂtĂ´ intĂ©zetek TSWV
rezisztens fajtákat állĂtottak elĂ´ szinte minden fajtatĂpusbĂłl, a Tsw rezisztenciagĂ©n sikeres beĂ©pĂtĂ©sĂ©vel.
2012-ben Szentes környékén nagymértékû fertôzést figyeltünk meg a TSWV rezisztens paprikafajtákon.
A jellegzetes levél és bogyó tünetek mellett nagyarányú növénypusztulást is észleltünk.
Az elĂ´zetes vizsgálatok bizonyĂtották a TSWV rezisztencia áttörĂ´ törzsĂ©nek jelenlĂ©tĂ©t. Molekuláris
összehasonlĂtĂł vizsgálatokat vĂ©geztĂĽnk Ă©s kĂĽlönbsĂ©get mutattunk ki az NSs rĂ©giĂłban a rezisztencia
áttörô és nem áttörô TSWV izolátumok között