Hanu R. Pappu

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BACKGROUND Viral small RNAs (vsiRNAs) in the infected host can be generated from viral double-stranded RNA replicative intermediates, self-complementary regions of the viral genome or from the action of host RNA-dependent RNA polymerases on viral templates. The vsiRNA abundance and profile as well as the endogenous small RNA population can vary between(More)
Tospoviruses cause serious economic losses to a wide range of field and horticultural crops on a global scale. The NSs gene encoded by tospoviruses acts as a suppressor of host plant defense. We identified amino acid motifs that are conserved in all of the NSs proteins of tospoviruses for which the sequence is known. Using tomato spotted wilt virus (TSWV)(More)
Tomato spotted wilt virus (TSWV) represents a major constraint to the production of important vegetable and ornamental crops in several countries around the world, including those in Europe. In spite of their economic importance, European TSWV isolates have only been partially characterized, and a complete genome sequence has not been determined yet. In(More)
The potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Triozidae), is a vector of the phloem-limited bacterium 'Candidatus Liberibacter solanacearum' (Lso), the putative causal agent of zebra chip disease of potato. Little is known about how potato psyllid transmits Lso to potato. We used electrical penetration graph (EPG) technology to compare(More)
BACKGROUND New viruses pathogenic to plants continue to emerge due to mutation, recombination, or reassortment among genomic segments among individual viruses. Tospoviruses cause significant economic damage to a wide range of crops in many parts of the world. The genetic or molecular basis of the continued emergence of new tospoviruses and new hosts is not(More)
The complete genome sequence of polygonum ringspot virus (PolRSV), genus Tospovirus, family Bunyaviridae, was determined. This is the first report of the complete genome sequence for a European tospovirus isolate. The large RNA of PolRSV was 8893 nucleotides (nt) in size and contained a single open reading frame of 8628 nucleotides in the(More)
Acibenzolar-S-Methyl (ASM) is a functional analog of salicylic acid (SA) that activates local and systemic acquired resistance (SAR) responses in plants against a wide variety of pathogens. Iris yellow spot virus (IYSV) is an economically important tospovirus of onion that causes severe economic losses to both bulb and seed crops. IYSV resistant onion(More)
Five potato virus S (PVS) isolates from the USA and three isolates from Chile were characterized based on biological and molecular properties to delineate these PVS isolates into either ordinary (PVSO) or Andean (PVSA) strains. Five isolates – 41956, Cosimar, Galaxy, ND2492-2R, and Q1 – were considered ordinary strains, as they induced local lesions on the(More)
Potato mop-top virus (PMTV; family Virgaviridae) was reported recently in the Pacific Northwestern USA. To better understand the genetic diversity of this virus, the complete genome of an isolate from Washington State (WA), USA, was characterized. Sequence comparisons of the WA isolate with other known sequences revealed that the RNA-Rep-encoded RdRp(More)
Two distinct caulimoviruses, Dahlia mosaic virus (DMV) and Dahlia common mosaic virus, and an endogenous plant pararetroviral sequence (DvEPRS) were reported in Dahlia spp. DvEPRS, previously referred to as DMV-D10, was originally identified in the US from the cultivated Dahlia variabilis, and has also been found in New Zealand, Lithuania and Egypt, as well(More)