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The fate of a Solanum steroidal alkaloid toxin in the cabbage looper (Trichoplusia ni).
Insect Biochem Mol Biol
December 2024
Department of Entomology, Cornell AgriTech, Cornell University, 14464, Geneva, NY, USA. Electronic address:
Plants produce complex chemical defenses against herbivores, resulting in the emergence of detoxification strategies in phytophagous insects. While enzymatic detoxification and target site mutagenesis are well-documented, the quantitative contribution of excretion remains less studied. We focus on the cabbage looper (Trichoplusia ni), a generalist herbivore, to elucidate the detoxification of a steroidal alkaloid, solanidine, produced in potato (Solanum tuberosum).
View Article and Find Full Text PDFDownregulation of APN1 and mutation in Bt Cry1Ac-resistant are genetically independent.
Appl Environ Microbiol
October 2024
Department of Entomology, Cornell University, Geneva, New York, USA.
The resistance to the insecticidal protein Cry1Ac from the bacterium (Bt) in the cabbage looper, , has previously been identified to be associated with a frameshift mutation in the ABC transporter ABCC2 gene and with altered expression of the aminopeptidase N (APN) genes and , shown as missing of the 110-kDa APN1 (phenotype APN1¯) in larval midgut brush border membrane vesicles (BBMV). In this study, genetic linkage analysis identified that the APN1¯ phenotype and the mutation in Cry1Ac-resistant segregated independently, although they were always associated under Cry1Ac selection. The mutation and APN1¯ phenotype were separated into two strains respectively.
View Article and Find Full Text PDFTrichoplusia ni Transcriptomic Responses to the Phytosaponin Aglycone Hederagenin: Sex-Related Differences.
J Chem Ecol
April 2024
Department of Plant Science, McGill University, 21,111 Lakeshore, Ste-Anne-de-Bellevue, QC, H9X 3V9, Canada.
Many plant species, particularly legumes, protect themselves with saponins. Previously, a correlation was observed between levels of oleanolic acid-derived saponins, such as hederagenin-derived compounds, in the legume Medicago truncatula and caterpillar deterrence. Using concentrations that reflect the foliar levels of hederagenin-type saponins, the sapogenin hederagenin was not toxic to 4th instar caterpillars of the cabbage looper Trichoplusia ni nor did it act as a feeding deterrent.
View Article and Find Full Text PDFPrecise genetic engineering with transposon in plants.
Plant Biotechnol (Tokyo)
December 2023
Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), 3-1-3 Kannondai.
Transposons are mobile genetic elements that can move to a different position within a genome or between genomes. They have long been used as a tool for genetic engineering, including transgenesis, insertional mutagenesis, and marker excision, in a variety of organisms. The transposon derived from the cabbage looper moth is one of the most promising transposon tools ever identified because has the advantage that it can transpose without leaving a footprint at the excised site.
View Article and Find Full Text PDFCompatibility of the fungus Beauveria bassiana and Trichoplusia ni SNPV against the cabbage looper Trichoplusia ni: crop plant matters.
Pest Manag Sci
June 2024
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada.
Background: Microbial insecticides are an important weapon in insect pest management, but their use is still relatively limited. One approach for increasing their efficacy and use could be to combine different pathogens to increase pest mortality. However, little is known about whether increasing pathogen diversity will improve pest management.
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