Abstract:
:As a result of contradictory reports, the avirulence (Avr) determinant that triggers Tsw gene-based resistance in Capsicum annuum against the Tomato spotted wilt virus (TSWV) is still unresolved. Here, the N and NSs genes of resistance-inducing (RI) and resistance-breaking (RB) isolates were cloned and transiently expressed in resistant Capsicum plants to determine the identity of the Avr protein. It was shown that the NSs(RI) protein triggered a hypersensitive response (HR) in Tsw-containing Capsicum plants, but not in susceptible Capsicum, whereas no HR was discerned after expression of the N(RI) (/) (RB) protein, or when NSs(RB) was expressed. Although NSs(RI) was able to suppress the silencing of a functional green fluorescence protein (GFP) construct during Agrobacterium tumefaciens transient assays on Nicotiana benthamiana, NSs(RB) had lost this capacity. The observation that RB isolates suppressed local GFP silencing during an infection indicated a recovery of RNA silencing suppressor activity for the NSs protein or the presence of another RNA interference (RNAi) suppressor. The role of NSs as RNA silencing suppressor and Avr determinant is discussed in the light of a putative interplay between RNAi and the natural Tsw resistance gene.
journal_name
Mol Plant Patholjournal_title
Molecular plant pathologyauthors
de Ronde D,Butterbach P,Lohuis D,Hedil M,van Lent JW,Kormelink Rdoi
10.1111/mpp.12016subject
Has Abstractpub_date
2013-05-01 00:00:00pages
405-15issue
4eissn
1464-6722issn
1364-3703journal_volume
14pub_type
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