Morin, S., Henderson, S., Fabrick, J. A., Carrière, Y., Dennehy, T. J., Brown, J. K., & Tabashnik, B. E. (2004). DNA-based detection of Bt resistance alleles in pink bollworm. Insect Biochemistry and Molecular Biology, 34(11), 1225-1233.
PMID: 15522618;Abstract:
Evolution of resistance by pests is the main threat to long-term insect control by transgenic crops that produce Bacillus thuringiensis (Bt) toxins. We previously identified three mutant alleles (r1, r2, r3) of a cadherin gene in pink bollworm (Pectinophora gossypiella) linked with recessive resistance to Bt toxin Cry1Ac and survival on transgenic Bt cotton. Here we describe a polymerase chain reaction (PCR)-based method that detects the mutation in genomic DNA of each of the three resistant alleles. Using primers that distinguish between resistant and susceptible (s) alleles, this method enables identification of 10 genotypes (r1r1, r1r2, r1r3, r2r2, r2r3, r3r3, r1s, r2s, r3s, and ss) at the cadherin locus. For each of the three resistant alleles, the method detected the resistance allele in a single heterozygote (r1s, r2s, or r3s) pooled with DNA from the equivalent of 19 susceptible (ss) individuals. The results suggest that the DNA-based detection method described here could greatly increase the efficiency of monitoring for resistance to Cry1Ac compared to bioassays that detect rare individuals with homozygous resistance. © 2004 Elsevier Ltd. All rights reserved.
Brown, J. K. (2017). Occurrence of Pepper mild mottle virus (PMMoV) in groundwater from a karst aquifer system in the Yucatan Peninsula, Mexico.. Food and Environmental Virology, 9(4), 487-497. doi:10.1007/s12560-017-9309-1.
Brown, J. K. (2014). First record of Jack Beardsley mealybug, Pseudococcus jackbeardsleyi (Hemiptera: Pseudococcidae), from Africa.. Flor. Entomol. Soc., 97, 1690-1693.
N’Guessan, P.W., Watson, G.W., Brown, J.K., N'Guessan, F.K. 2014. First record of Jack Beardsley mealybug, Pseudococcus jackbeardsleyi (Hemiptera: Pseudococcidae), from Africa. Flor. Entomol. Soc. 97:1690-1693.
Idris, A., Abdullah, N., & Brown, J. (2012). Leaf curl disease of two solanaceous species in Southwest Arabia are caused by a monopartite begomovirus evolutionarily most related to a species from the Nile Basin and a unique betasatellite. Virus Res, 169, 269-300.
Idris, A.M., Abdullah, N.M., and Brown, J.K. 2012. Leaf curl disease of two solanaceous species in Southwest Arabia are caused by a monopartite begomovirus evolutionarily most related to a species from the Nile Basin and a unique betasatellite. Virus Res. 169: 296-300.
Sabanadzovic, S., Valverde, R. A., Brown, J. K., Martin, R. R., & Tzanetakis, I. E. (2009). Southern tomato virus: The link between the families Totiviridae and Partitiviridae. Virus Research, 140(1-2), 130-137.
PMID: 19118586;Abstract:
A dsRNA virus with a genome of 3.5 kb was isolated from field and greenhouse-grown tomato plants of different cultivars and geographic locations in North America. Cloning and sequencing of the viral genome showed the presence of two partially overlapping open reading frames (ORFs), and a genomic organization resembling members of the family Totiviridae that comprises fungal and protozoan viruses, but not plant viruses. The 5′-proximal ORF codes for a 377 amino acid-long protein of unknown function, whereas the product of ORF2 contains typical motifs of an RNA-dependant RNA-polymerase and is likely expressed by a +1 ribosomal frame shift. Despite the similarity in the genome organization with members of the family Totiviridae, this virus shared very limited sequence homology with known totiviruses or with other viruses. Repeated attempts to detect the presence of an endophytic fungus as the possible host of the virus failed, supporting its phytoviral nature. The virus was efficiently transmitted by seed but not mechanically and/or by grafting. Phylogenetic analyses revealed that this virus, for which the name Southern tomato virus (STV) is proposed, belongs to a partitivirus-like lineage and represents a species of a new taxon of plant viruses. © 2008 Elsevier B.V.
