Karen E. Keller

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Rose rosette was first described in the early 1940s and it has emerged as one of the most devastating diseases of roses. Although it has been 70 years since the disease description, the rosette agent is yet to be characterized. In this communication, we identify and characterize the putative causal agent of the disease, a negative-sense RNA virus and new(More)
0308-8146/$ see front matter Published by Elsevier doi:10.1016/j.foodchem.2009.03.082 * Corresponding author. Tel.: +1 208 722 6701x282 E-mail addresses: jlee@uidaho.edu, jungmin.lee@ keller@ars.usda.gov (K.E. Keller), chris.rennaker@ars. martin@ars.usda.gov (R.R. Martin). Individual free amino acids, yeast assimilable amino acid (YAN) content, ammonia,(More)
Pea (Pisum sativum L.) has a genome of about 4 Gb that appears to share conserved synteny with model legumes having genomes of 0.2-0.4 Gb despite extensive intergenic expansion. Pea plant inventory (PI) accession 269818 has been used to introgress genetic diversity into the cultivated germplasm pool. The aim here was to develop pea bacterial artificial(More)
The mechanism of Pisum sativum pathotype-specific resistance to pea seed-borne mosaic potyvirus (PSbMV) was investigated and the coding region determinant of PSbMV virulence was defined. Homozygous recessive sbm-1 peas are unable to support replication of PSbMV pathotype 1 (P-1), whereas biochemically and serologically related pathotype 4 (P-4) is fully(More)
Molecular characterization of eight distinct, difficult-to-clone RNA plant viruses was accomplished after the development of a reverse transcriptase-based first- and second-strand cDNA synthesis method. Double-stranded (ds) RNA templates isolated from strawberry and blackberry and several herbaceous hosts (mint, pea and tobacco) were cloned using this(More)
Childhood cancer survivors are at risk for development of subsequent neoplasms of the CNS. Better understanding of the rates, risk factors, and outcomes of subsequent neoplasms of the CNS among survivors of childhood cancer could lead to more informed screening guidelines. Two investigators independently did a systematic search of Medline and Embase (from(More)
A tobacco etch virus (TEV)-based expression vector has been used for insertion of several ORFs derived from the unrelated beet yellows virus (BYV). Hybrid TEV variants expressing the BYV capsid protein, 20-kDa protein, or HSP70 homolog systemically infected Nicotiana tabacum and stably retained BYV sequences. In contrast, insertion of the ORF encoding BYV(More)
Yellow ringspot is the only virus-like disease reported in redbud (Cercis spp.) with symptoms including vein clearing, chlorotic ringspots and oak-leaf pattern. A putative new emaravirus was present in all trees displaying typical yellow ringspot symptoms and the name redbud yellow ringspot associated virus is proposed. The virus genome is composed of at(More)
Two isolates of pea seed-borne mosaic potyvirus, DPD1 and NY, were identified as pathotypes P-1 and P-4, respectively, by their infectivity on Pisum sativum L. lines homozygous for the recessive resistance genes sbm-1 and sbm-4. The two isolates differed in several biological characteristics. DPD1 induced transient vein clearing, downward rolling of(More)
Two pea seedborne mosaic potyvirus (PSbMV) isolates, P-1 DPD1 (P-1), which is highly seed-transmitted, and P-4 NY (P-4), which is rarely seed-transmitted, and chimeras between P-1 and P-4 were analysed to map the viral genetic determinants of seed transmission. Infectivity of chimeric viruses was evaluated by inoculating Pisum sativum with RNA transcribed(More)